├── .gitignore ├── LICENSE ├── MRZ_chars.doc ├── OCRB ├── 0.png ├── 1.png ├── 2.png ├── 3.png ├── 4.png ├── 5.png ├── 6.png ├── 7.png ├── 8.png ├── 9.png ├── <.png ├── A.png ├── B.png ├── C.png ├── D.png ├── E.png ├── F.png ├── G.png ├── H.png ├── I.png ├── J.png ├── K.png ├── L.png ├── M.png ├── N.png ├── O.png ├── P.png ├── Q.png ├── R.png ├── S.png ├── T.png ├── U.png ├── V.png ├── W.png ├── X.png ├── Y.png └── Z.png ├── README.md ├── detect.cpp ├── examples ├── passport_01.jpg ├── passport_02.jpg ├── passport_03.jpg ├── passport_04.jpg ├── passport_05.jpg └── passport_06.jpg ├── find_mrz.cpp ├── find_mrz.h ├── mrz.cpp ├── mrz.h ├── ocrb.png ├── tessdata └── eng.traineddata └── test_data ├── mrz_example_01.jpg ├── mrz_example_02.jpg ├── mrz_example_03.jpg ├── mrz_example_04.jpg ├── mrz_example_05.jpg └── mrz_example_06.jpg /.gitignore: -------------------------------------------------------------------------------- 1 | .cproject 2 | .project 3 | .settings 4 | Debug 5 | Release 6 | training.data 7 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. We, the Free Software Foundation, use the 18 | GNU General Public License for most of our software; it applies also to 19 | any other work released this way by its authors. You can apply it to 20 | your programs, too. 21 | 22 | When we speak of free software, we are referring to freedom, not 23 | price. Our General Public Licenses are designed to make sure that you 24 | have the freedom to distribute copies of free software (and charge for 25 | them if you wish), that you receive source code or can get it if you 26 | want it, that you can change the software or use pieces of it in new 27 | free programs, and that you know you can do these things. 28 | 29 | To protect your rights, we need to prevent others from denying you 30 | these rights or asking you to surrender the rights. Therefore, you have 31 | certain responsibilities if you distribute copies of the software, or if 32 | you modify it: responsibilities to respect the freedom of others. 33 | 34 | For example, if you distribute copies of such a program, whether 35 | gratis or for a fee, you must pass on to the recipients the same 36 | freedoms that you received. You must make sure that they, too, receive 37 | or can get the source code. And you must show them these terms so they 38 | know their rights. 39 | 40 | Developers that use the GNU GPL protect your rights with two steps: 41 | (1) assert copyright on the software, and (2) offer you this License 42 | giving you legal permission to copy, distribute and/or modify it. 43 | 44 | For the developers' and authors' protection, the GPL clearly explains 45 | that there is no warranty for this free software. For both users' and 46 | authors' sake, the GPL requires that modified versions be marked as 47 | changed, so that their problems will not be attributed erroneously to 48 | authors of previous versions. 49 | 50 | Some devices are designed to deny users access to install or run 51 | modified versions of the software inside them, although the manufacturer 52 | can do so. This is fundamentally incompatible with the aim of 53 | protecting users' freedom to change the software. The systematic 54 | pattern of such abuse occurs in the area of products for individuals to 55 | use, which is precisely where it is most unacceptable. Therefore, we 56 | have designed this version of the GPL to prohibit the practice for those 57 | products. If such problems arise substantially in other domains, we 58 | stand ready to extend this provision to those domains in future versions 59 | of the GPL, as needed to protect the freedom of users. 60 | 61 | Finally, every program is threatened constantly by software patents. 62 | States should not allow patents to restrict development and use of 63 | software on general-purpose computers, but in those that do, we wish to 64 | avoid the special danger that patents applied to a free program could 65 | make it effectively proprietary. To prevent this, the GPL assures that 66 | patents cannot be used to render the program non-free. 67 | 68 | The precise terms and conditions for copying, distribution and 69 | modification follow. 70 | 71 | TERMS AND CONDITIONS 72 | 73 | 0. Definitions. 74 | 75 | "This License" refers to version 3 of the GNU General Public License. 76 | 77 | "Copyright" also means copyright-like laws that apply to other kinds of 78 | works, such as semiconductor masks. 79 | 80 | "The Program" refers to any copyrightable work licensed under this 81 | License. Each licensee is addressed as "you". "Licensees" and 82 | "recipients" may be individuals or organizations. 83 | 84 | To "modify" a work means to copy from or adapt all or part of the work 85 | in a fashion requiring copyright permission, other than the making of an 86 | exact copy. The resulting work is called a "modified version" of the 87 | earlier work or a work "based on" the earlier work. 88 | 89 | A "covered work" means either the unmodified Program or a work based 90 | on the Program. 91 | 92 | To "propagate" a work means to do anything with it that, without 93 | permission, would make you directly or secondarily liable for 94 | infringement under applicable copyright law, except executing it on a 95 | computer or modifying a private copy. Propagation includes copying, 96 | distribution (with or without modification), making available to the 97 | public, and in some countries other activities as well. 98 | 99 | To "convey" a work means any kind of propagation that enables other 100 | parties to make or receive copies. Mere interaction with a user through 101 | a computer network, with no transfer of a copy, is not conveying. 102 | 103 | An interactive user interface displays "Appropriate Legal Notices" 104 | to the extent that it includes a convenient and prominently visible 105 | feature that (1) displays an appropriate copyright notice, and (2) 106 | tells the user that there is no warranty for the work (except to the 107 | extent that warranties are provided), that licensees may convey the 108 | work under this License, and how to view a copy of this License. If 109 | the interface presents a list of user commands or options, such as a 110 | menu, a prominent item in the list meets this criterion. 111 | 112 | 1. Source Code. 113 | 114 | The "source code" for a work means the preferred form of the work 115 | for making modifications to it. "Object code" means any non-source 116 | form of a work. 117 | 118 | A "Standard Interface" means an interface that either is an official 119 | standard defined by a recognized standards body, or, in the case of 120 | interfaces specified for a particular programming language, one that 121 | is widely used among developers working in that language. 122 | 123 | The "System Libraries" of an executable work include anything, other 124 | than the work as a whole, that (a) is included in the normal form of 125 | packaging a Major Component, but which is not part of that Major 126 | Component, and (b) serves only to enable use of the work with that 127 | Major Component, or to implement a Standard Interface for which an 128 | implementation is available to the public in source code form. A 129 | "Major Component", in this context, means a major essential component 130 | (kernel, window system, and so on) of the specific operating system 131 | (if any) on which the executable work runs, or a compiler used to 132 | produce the work, or an object code interpreter used to run it. 133 | 134 | The "Corresponding Source" for a work in object code form means all 135 | the source code needed to generate, install, and (for an executable 136 | work) run the object code and to modify the work, including scripts to 137 | control those activities. However, it does not include the work's 138 | System Libraries, or general-purpose tools or generally available free 139 | programs which are used unmodified in performing those activities but 140 | which are not part of the work. For example, Corresponding Source 141 | includes interface definition files associated with source files for 142 | the work, and the source code for shared libraries and dynamically 143 | linked subprograms that the work is specifically designed to require, 144 | such as by intimate data communication or control flow between those 145 | subprograms and other parts of the work. 146 | 147 | The Corresponding Source need not include anything that users 148 | can regenerate automatically from other parts of the Corresponding 149 | Source. 150 | 151 | The Corresponding Source for a work in source code form is that 152 | same work. 153 | 154 | 2. Basic Permissions. 155 | 156 | All rights granted under this License are granted for the term of 157 | copyright on the Program, and are irrevocable provided the stated 158 | conditions are met. This License explicitly affirms your unlimited 159 | permission to run the unmodified Program. The output from running a 160 | covered work is covered by this License only if the output, given its 161 | content, constitutes a covered work. This License acknowledges your 162 | rights of fair use or other equivalent, as provided by copyright law. 163 | 164 | You may make, run and propagate covered works that you do not 165 | convey, without conditions so long as your license otherwise remains 166 | in force. You may convey covered works to others for the sole purpose 167 | of having them make modifications exclusively for you, or provide you 168 | with facilities for running those works, provided that you comply with 169 | the terms of this License in conveying all material for which you do 170 | not control copyright. Those thus making or running the covered works 171 | for you must do so exclusively on your behalf, under your direction 172 | and control, on terms that prohibit them from making any copies of 173 | your copyrighted material outside their relationship with you. 174 | 175 | Conveying under any other circumstances is permitted solely under 176 | the conditions stated below. Sublicensing is not allowed; section 10 177 | makes it unnecessary. 178 | 179 | 3. Protecting Users' Legal Rights From Anti-Circumvention Law. 180 | 181 | No covered work shall be deemed part of an effective technological 182 | measure under any applicable law fulfilling obligations under article 183 | 11 of the WIPO copyright treaty adopted on 20 December 1996, or 184 | similar laws prohibiting or restricting circumvention of such 185 | measures. 186 | 187 | When you convey a covered work, you waive any legal power to forbid 188 | circumvention of technological measures to the extent such circumvention 189 | is effected by exercising rights under this License with respect to 190 | the covered work, and you disclaim any intention to limit operation or 191 | modification of the work as a means of enforcing, against the work's 192 | users, your or third parties' legal rights to forbid circumvention of 193 | technological measures. 194 | 195 | 4. Conveying Verbatim Copies. 196 | 197 | You may convey verbatim copies of the Program's source code as you 198 | receive it, in any medium, provided that you conspicuously and 199 | appropriately publish on each copy an appropriate copyright notice; 200 | keep intact all notices stating that this License and any 201 | non-permissive terms added in accord with section 7 apply to the code; 202 | keep intact all notices of the absence of any warranty; and give all 203 | recipients a copy of this License along with the Program. 204 | 205 | You may charge any price or no price for each copy that you convey, 206 | and you may offer support or warranty protection for a fee. 207 | 208 | 5. Conveying Modified Source Versions. 209 | 210 | You may convey a work based on the Program, or the modifications to 211 | produce it from the Program, in the form of source code under the 212 | terms of section 4, provided that you also meet all of these conditions: 213 | 214 | a) The work must carry prominent notices stating that you modified 215 | it, and giving a relevant date. 216 | 217 | b) The work must carry prominent notices stating that it is 218 | released under this License and any conditions added under section 219 | 7. This requirement modifies the requirement in section 4 to 220 | "keep intact all notices". 221 | 222 | c) You must license the entire work, as a whole, under this 223 | License to anyone who comes into possession of a copy. This 224 | License will therefore apply, along with any applicable section 7 225 | additional terms, to the whole of the work, and all its parts, 226 | regardless of how they are packaged. This License gives no 227 | permission to license the work in any other way, but it does not 228 | invalidate such permission if you have separately received it. 229 | 230 | d) If the work has interactive user interfaces, each must display 231 | Appropriate Legal Notices; however, if the Program has interactive 232 | interfaces that do not display Appropriate Legal Notices, your 233 | work need not make them do so. 234 | 235 | A compilation of a covered work with other separate and independent 236 | works, which are not by their nature extensions of the covered work, 237 | and which are not combined with it such as to form a larger program, 238 | in or on a volume of a storage or distribution medium, is called an 239 | "aggregate" if the compilation and its resulting copyright are not 240 | used to limit the access or legal rights of the compilation's users 241 | beyond what the individual works permit. Inclusion of a covered work 242 | in an aggregate does not cause this License to apply to the other 243 | parts of the aggregate. 244 | 245 | 6. Conveying Non-Source Forms. 246 | 247 | You may convey a covered work in object code form under the terms 248 | of sections 4 and 5, provided that you also convey the 249 | machine-readable Corresponding Source under the terms of this License, 250 | in one of these ways: 251 | 252 | a) Convey the object code in, or embodied in, a physical product 253 | (including a physical distribution medium), accompanied by the 254 | Corresponding Source fixed on a durable physical medium 255 | customarily used for software interchange. 256 | 257 | b) Convey the object code in, or embodied in, a physical product 258 | (including a physical distribution medium), accompanied by a 259 | written offer, valid for at least three years and valid for as 260 | long as you offer spare parts or customer support for that product 261 | model, to give anyone who possesses the object code either (1) a 262 | copy of the Corresponding Source for all the software in the 263 | product that is covered by this License, on a durable physical 264 | medium customarily used for software interchange, for a price no 265 | more than your reasonable cost of physically performing this 266 | conveying of source, or (2) access to copy the 267 | Corresponding Source from a network server at no charge. 268 | 269 | c) Convey individual copies of the object code with a copy of the 270 | written offer to provide the Corresponding Source. This 271 | alternative is allowed only occasionally and noncommercially, and 272 | only if you received the object code with such an offer, in accord 273 | with subsection 6b. 274 | 275 | d) Convey the object code by offering access from a designated 276 | place (gratis or for a charge), and offer equivalent access to the 277 | Corresponding Source in the same way through the same place at no 278 | further charge. You need not require recipients to copy the 279 | Corresponding Source along with the object code. If the place to 280 | copy the object code is a network server, the Corresponding Source 281 | may be on a different server (operated by you or a third party) 282 | that supports equivalent copying facilities, provided you maintain 283 | clear directions next to the object code saying where to find the 284 | Corresponding Source. Regardless of what server hosts the 285 | Corresponding Source, you remain obligated to ensure that it is 286 | available for as long as needed to satisfy these requirements. 287 | 288 | e) Convey the object code using peer-to-peer transmission, provided 289 | you inform other peers where the object code and Corresponding 290 | Source of the work are being offered to the general public at no 291 | charge under subsection 6d. 292 | 293 | A separable portion of the object code, whose source code is excluded 294 | from the Corresponding Source as a System Library, need not be 295 | included in conveying the object code work. 296 | 297 | A "User Product" is either (1) a "consumer product", which means any 298 | tangible personal property which is normally used for personal, family, 299 | or household purposes, or (2) anything designed or sold for incorporation 300 | into a dwelling. In determining whether a product is a consumer product, 301 | doubtful cases shall be resolved in favor of coverage. For a particular 302 | product received by a particular user, "normally used" refers to a 303 | typical or common use of that class of product, regardless of the status 304 | of the particular user or of the way in which the particular user 305 | actually uses, or expects or is expected to use, the product. A product 306 | is a consumer product regardless of whether the product has substantial 307 | commercial, industrial or non-consumer uses, unless such uses represent 308 | the only significant mode of use of the product. 309 | 310 | "Installation Information" for a User Product means any methods, 311 | procedures, authorization keys, or other information required to install 312 | and execute modified versions of a covered work in that User Product from 313 | a modified version of its Corresponding Source. The information must 314 | suffice to ensure that the continued functioning of the modified object 315 | code is in no case prevented or interfered with solely because 316 | modification has been made. 317 | 318 | If you convey an object code work under this section in, or with, or 319 | specifically for use in, a User Product, and the conveying occurs as 320 | part of a transaction in which the right of possession and use of the 321 | User Product is transferred to the recipient in perpetuity or for a 322 | fixed term (regardless of how the transaction is characterized), the 323 | Corresponding Source conveyed under this section must be accompanied 324 | by the Installation Information. But this requirement does not apply 325 | if neither you nor any third party retains the ability to install 326 | modified object code on the User Product (for example, the work has 327 | been installed in ROM). 328 | 329 | The requirement to provide Installation Information does not include a 330 | requirement to continue to provide support service, warranty, or updates 331 | for a work that has been modified or installed by the recipient, or for 332 | the User Product in which it has been modified or installed. Access to a 333 | network may be denied when the modification itself materially and 334 | adversely affects the operation of the network or violates the rules and 335 | protocols for communication across the network. 336 | 337 | Corresponding Source conveyed, and Installation Information provided, 338 | in accord with this section must be in a format that is publicly 339 | documented (and with an implementation available to the public in 340 | source code form), and must require no special password or key for 341 | unpacking, reading or copying. 342 | 343 | 7. Additional Terms. 344 | 345 | "Additional permissions" are terms that supplement the terms of this 346 | License by making exceptions from one or more of its conditions. 347 | Additional permissions that are applicable to the entire Program shall 348 | be treated as though they were included in this License, to the extent 349 | that they are valid under applicable law. If additional permissions 350 | apply only to part of the Program, that part may be used separately 351 | under those permissions, but the entire Program remains governed by 352 | this License without regard to the additional permissions. 353 | 354 | When you convey a copy of a covered work, you may at your option 355 | remove any additional permissions from that copy, or from any part of 356 | it. (Additional permissions may be written to require their own 357 | removal in certain cases when you modify the work.) You may place 358 | additional permissions on material, added by you to a covered work, 359 | for which you have or can give appropriate copyright permission. 360 | 361 | Notwithstanding any other provision of this License, for material you 362 | add to a covered work, you may (if authorized by the copyright holders of 363 | that material) supplement the terms of this License with terms: 364 | 365 | a) Disclaiming warranty or limiting liability differently from the 366 | terms of sections 15 and 16 of this License; or 367 | 368 | b) Requiring preservation of specified reasonable legal notices or 369 | author attributions in that material or in the Appropriate Legal 370 | Notices displayed by works containing it; or 371 | 372 | c) Prohibiting misrepresentation of the origin of that material, or 373 | requiring that modified versions of such material be marked in 374 | reasonable ways as different from the original version; or 375 | 376 | d) Limiting the use for publicity purposes of names of licensors or 377 | authors of the material; or 378 | 379 | e) Declining to grant rights under trademark law for use of some 380 | trade names, trademarks, or service marks; or 381 | 382 | f) Requiring indemnification of licensors and authors of that 383 | material by anyone who conveys the material (or modified versions of 384 | it) with contractual assumptions of liability to the recipient, for 385 | any liability that these contractual assumptions directly impose on 386 | those licensors and authors. 387 | 388 | All other non-permissive additional terms are considered "further 389 | restrictions" within the meaning of section 10. If the Program as you 390 | received it, or any part of it, contains a notice stating that it is 391 | governed by this License along with a term that is a further 392 | restriction, you may remove that term. If a license document contains 393 | a further restriction but permits relicensing or conveying under this 394 | License, you may add to a covered work material governed by the terms 395 | of that license document, provided that the further restriction does 396 | not survive such relicensing or conveying. 397 | 398 | If you add terms to a covered work in accord with this section, you 399 | must place, in the relevant source files, a statement of the 400 | additional terms that apply to those files, or a notice indicating 401 | where to find the applicable terms. 402 | 403 | Additional terms, permissive or non-permissive, may be stated in the 404 | form of a separately written license, or stated as exceptions; 405 | the above requirements apply either way. 406 | 407 | 8. Termination. 408 | 409 | You may not propagate or modify a covered work except as expressly 410 | provided under this License. Any attempt otherwise to propagate or 411 | modify it is void, and will automatically terminate your rights under 412 | this License (including any patent licenses granted under the third 413 | paragraph of section 11). 414 | 415 | However, if you cease all violation of this License, then your 416 | license from a particular copyright holder is reinstated (a) 417 | provisionally, unless and until the copyright holder explicitly and 418 | finally terminates your license, and (b) permanently, if the copyright 419 | holder fails to notify you of the violation by some reasonable means 420 | prior to 60 days after the cessation. 421 | 422 | Moreover, your license from a particular copyright holder is 423 | reinstated permanently if the copyright holder notifies you of the 424 | violation by some reasonable means, this is the first time you have 425 | received notice of violation of this License (for any work) from that 426 | copyright holder, and you cure the violation prior to 30 days after 427 | your receipt of the notice. 428 | 429 | Termination of your rights under this section does not terminate the 430 | licenses of parties who have received copies or rights from you under 431 | this License. If your rights have been terminated and not permanently 432 | reinstated, you do not qualify to receive new licenses for the same 433 | material under section 10. 434 | 435 | 9. Acceptance Not Required for Having Copies. 436 | 437 | You are not required to accept this License in order to receive or 438 | run a copy of the Program. Ancillary propagation of a covered work 439 | occurring solely as a consequence of using peer-to-peer transmission 440 | to receive a copy likewise does not require acceptance. However, 441 | nothing other than this License grants you permission to propagate or 442 | modify any covered work. These actions infringe copyright if you do 443 | not accept this License. Therefore, by modifying or propagating a 444 | covered work, you indicate your acceptance of this License to do so. 445 | 446 | 10. Automatic Licensing of Downstream Recipients. 447 | 448 | Each time you convey a covered work, the recipient automatically 449 | receives a license from the original licensors, to run, modify and 450 | propagate that work, subject to this License. You are not responsible 451 | for enforcing compliance by third parties with this License. 452 | 453 | An "entity transaction" is a transaction transferring control of an 454 | organization, or substantially all assets of one, or subdividing an 455 | organization, or merging organizations. If propagation of a covered 456 | work results from an entity transaction, each party to that 457 | transaction who receives a copy of the work also receives whatever 458 | licenses to the work the party's predecessor in interest had or could 459 | give under the previous paragraph, plus a right to possession of the 460 | Corresponding Source of the work from the predecessor in interest, if 461 | the predecessor has it or can get it with reasonable efforts. 462 | 463 | You may not impose any further restrictions on the exercise of the 464 | rights granted or affirmed under this License. For example, you may 465 | not impose a license fee, royalty, or other charge for exercise of 466 | rights granted under this License, and you may not initiate litigation 467 | (including a cross-claim or counterclaim in a lawsuit) alleging that 468 | any patent claim is infringed by making, using, selling, offering for 469 | sale, or importing the Program or any portion of it. 470 | 471 | 11. Patents. 472 | 473 | A "contributor" is a copyright holder who authorizes use under this 474 | License of the Program or a work on which the Program is based. The 475 | work thus licensed is called the contributor's "contributor version". 476 | 477 | A contributor's "essential patent claims" are all patent claims 478 | owned or controlled by the contributor, whether already acquired or 479 | hereafter acquired, that would be infringed by some manner, permitted 480 | by this License, of making, using, or selling its contributor version, 481 | but do not include claims that would be infringed only as a 482 | consequence of further modification of the contributor version. For 483 | purposes of this definition, "control" includes the right to grant 484 | patent sublicenses in a manner consistent with the requirements of 485 | this License. 486 | 487 | Each contributor grants you a non-exclusive, worldwide, royalty-free 488 | patent license under the contributor's essential patent claims, to 489 | make, use, sell, offer for sale, import and otherwise run, modify and 490 | propagate the contents of its contributor version. 491 | 492 | In the following three paragraphs, a "patent license" is any express 493 | agreement or commitment, however denominated, not to enforce a patent 494 | (such as an express permission to practice a patent or covenant not to 495 | sue for patent infringement). To "grant" such a patent license to a 496 | party means to make such an agreement or commitment not to enforce a 497 | patent against the party. 498 | 499 | If you convey a covered work, knowingly relying on a patent license, 500 | and the Corresponding Source of the work is not available for anyone 501 | to copy, free of charge and under the terms of this License, through a 502 | publicly available network server or other readily accessible means, 503 | then you must either (1) cause the Corresponding Source to be so 504 | available, or (2) arrange to deprive yourself of the benefit of the 505 | patent license for this particular work, or (3) arrange, in a manner 506 | consistent with the requirements of this License, to extend the patent 507 | license to downstream recipients. "Knowingly relying" means you have 508 | actual knowledge that, but for the patent license, your conveying the 509 | covered work in a country, or your recipient's use of the covered work 510 | in a country, would infringe one or more identifiable patents in that 511 | country that you have reason to believe are valid. 512 | 513 | If, pursuant to or in connection with a single transaction or 514 | arrangement, you convey, or propagate by procuring conveyance of, a 515 | covered work, and grant a patent license to some of the parties 516 | receiving the covered work authorizing them to use, propagate, modify 517 | or convey a specific copy of the covered work, then the patent license 518 | you grant is automatically extended to all recipients of the covered 519 | work and works based on it. 520 | 521 | A patent license is "discriminatory" if it does not include within 522 | the scope of its coverage, prohibits the exercise of, or is 523 | conditioned on the non-exercise of one or more of the rights that are 524 | specifically granted under this License. You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /MRZ_chars.doc: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/MRZ_chars.doc -------------------------------------------------------------------------------- /OCRB/0.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/0.png -------------------------------------------------------------------------------- /OCRB/1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/1.png -------------------------------------------------------------------------------- /OCRB/2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/2.png -------------------------------------------------------------------------------- /OCRB/3.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/3.png -------------------------------------------------------------------------------- /OCRB/4.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/4.png -------------------------------------------------------------------------------- /OCRB/5.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/5.png -------------------------------------------------------------------------------- /OCRB/6.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/6.png -------------------------------------------------------------------------------- /OCRB/7.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/7.png -------------------------------------------------------------------------------- /OCRB/8.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/8.png -------------------------------------------------------------------------------- /OCRB/9.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/9.png -------------------------------------------------------------------------------- /OCRB/<.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/<.png -------------------------------------------------------------------------------- /OCRB/A.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/A.png -------------------------------------------------------------------------------- /OCRB/B.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/B.png -------------------------------------------------------------------------------- /OCRB/C.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/C.png -------------------------------------------------------------------------------- /OCRB/D.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/D.png -------------------------------------------------------------------------------- /OCRB/E.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/E.png -------------------------------------------------------------------------------- /OCRB/F.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/F.png -------------------------------------------------------------------------------- /OCRB/G.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/G.png -------------------------------------------------------------------------------- /OCRB/H.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/H.png -------------------------------------------------------------------------------- /OCRB/I.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/I.png -------------------------------------------------------------------------------- /OCRB/J.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/J.png -------------------------------------------------------------------------------- /OCRB/K.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/K.png -------------------------------------------------------------------------------- /OCRB/L.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/L.png -------------------------------------------------------------------------------- /OCRB/M.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/M.png -------------------------------------------------------------------------------- /OCRB/N.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/N.png -------------------------------------------------------------------------------- /OCRB/O.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/O.png -------------------------------------------------------------------------------- /OCRB/P.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/P.png -------------------------------------------------------------------------------- /OCRB/Q.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/Q.png -------------------------------------------------------------------------------- /OCRB/R.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/R.png -------------------------------------------------------------------------------- /OCRB/S.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/S.png -------------------------------------------------------------------------------- /OCRB/T.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/T.png -------------------------------------------------------------------------------- /OCRB/U.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/U.png -------------------------------------------------------------------------------- /OCRB/V.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/V.png -------------------------------------------------------------------------------- /OCRB/W.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/W.png -------------------------------------------------------------------------------- /OCRB/X.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/X.png -------------------------------------------------------------------------------- /OCRB/Y.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/Y.png -------------------------------------------------------------------------------- /OCRB/Z.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/OCRB/Z.png -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # passport_mrz_detector_cpp 2 | Detects Machine Readable Zones in images of identity documents such as passports. 3 | C++ port of http://www.pyimagesearch.com/2015/11/30/detecting-machine-readable-zones-in-passport-images/ 4 | -------------------------------------------------------------------------------- /detect.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | 14 | #include "debug.h" 15 | #include "ocr.h" 16 | #include "mrz.h" 17 | #include "RecogniserKNearest.h" 18 | #include "RecogniserAbsDiff.h" 19 | #include "find_mrz.h" 20 | #include "find_borders.h" 21 | #include "getcwd.h" 22 | #include "file_capture.h" 23 | #include "sliding_window_capture.h" 24 | 25 | using namespace std; 26 | using namespace cv; 27 | using namespace ocr; 28 | 29 | #if 0 30 | #define USE_TESSERACT 31 | #endif 32 | #define CHAR_SIZE_TOLERANCE 0.15 33 | #define MRZ_LINE_SPACING 1.0 34 | #define TRAINING_DATA_FILENAME "training.data" 35 | 36 | #if 1 37 | #define DISPLAY_INTERMEDIATE_IMAGES 38 | #endif 39 | 40 | static void calc_char_cell(const Size &mrz_size, Size &char_min, Size &char_max, 41 | MRZ *mrz = NULL) 42 | { 43 | unsigned int min_lines, max_lines; 44 | unsigned int min_chars_per_line, max_chars_per_line; 45 | if (NULL == mrz) { 46 | min_chars_per_line = MRZ::getMinCharsPerLine(); 47 | max_chars_per_line = MRZ::getMaxCharsPerLine(); 48 | min_lines = MRZ::getMinLineCount(); 49 | max_lines = MRZ::getMaxLineCount(); 50 | } else { 51 | min_chars_per_line = mrz->getCharsPerLine(); 52 | max_chars_per_line = min_chars_per_line; 53 | min_lines = mrz->getLineCount(); 54 | max_lines = min_lines; 55 | } 56 | // Account for inter-line spacing 57 | min_lines *= MRZ_LINE_SPACING + 1; 58 | min_lines -= 1; 59 | max_lines *= MRZ_LINE_SPACING + 1; 60 | max_lines -= 1; 61 | char_min = Size((double) mrz_size.width / (double) max_chars_per_line, 62 | (double) mrz_size.height / (double) max_lines); 63 | char_max = Size((double) mrz_size.width / (double) min_chars_per_line, 64 | (double) mrz_size.height / (double) min_lines); 65 | // Add a tolerance 66 | char_min.width /= (1 + CHAR_SIZE_TOLERANCE); 67 | char_min.height /= (1 + CHAR_SIZE_TOLERANCE); 68 | char_max.width *= (1 + CHAR_SIZE_TOLERANCE); 69 | char_max.height *= (1 + CHAR_SIZE_TOLERANCE); 70 | #if 0 71 | cerr << "Char min rect: " << char_min << endl; 72 | cerr << "Char max rect: " << char_max << endl; 73 | #endif 74 | // Additional tuning for minimum width. 75 | // Although OCR B is monospaced, some character glyphs are much narrower than others. 76 | char_min.width *= 0.25; 77 | // Additional tuning for minimum height. 78 | // Line spacing varies widely. 79 | char_min.height *= 0.75; 80 | } 81 | 82 | static bool is_character(const Rect boundingRect, const Size &minSize, 83 | const Size &maxSize) 84 | { 85 | return boundingRect.width >= minSize.width 86 | && boundingRect.height >= minSize.height 87 | && boundingRect.width <= maxSize.width 88 | && boundingRect.height <= maxSize.height; 89 | } 90 | 91 | static void find_character_bboxes(const Mat &image, const Rect &borders, vector &char_bboxes, 92 | MRZ *mrz = NULL) 93 | { 94 | vector > contours; 95 | Mat work = image.clone(); 96 | findContours(work, contours, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE, borders.tl()); 97 | Size char_min, char_max; 98 | calc_char_cell(image.size(), char_min, char_max, mrz); 99 | for_each( 100 | contours.begin(), contours.end(), 101 | [&char_bboxes, char_min, char_max, &work] 102 | (vector &contour) { 103 | Rect br = boundingRect(contour); 104 | if (is_character(br, char_min, char_max)) { 105 | // dump_rect("Character", br); 106 | #if 0 && defined(DISPLAY_INTERMEDIATE_IMAGES) 107 | drawContours(work, contour, -1, Scalar(1, 1, 1)); 108 | #endif 109 | char_bboxes.push_back(br); 110 | } else { 111 | // Not the right size 112 | dump_rect("Rejected char", br); 113 | } 114 | } 115 | ); 116 | #if 0 && defined(DISPLAY_INTERMEDIATE_IMAGES) 117 | display_image("Character contours", work); 118 | #endif 119 | } 120 | 121 | static void assign_to_lines(const Size &image_size, 122 | const vector &char_bboxes, vector > &lines, 123 | vector &indeterminate) 124 | { 125 | for_each(char_bboxes.begin(), char_bboxes.end(), 126 | [image_size, &lines, &indeterminate](const Rect &bbox) { 127 | unsigned int line_num; 128 | bool found = false; 129 | for (line_num = 0; line_num < lines.size(); line_num++) { 130 | int top = image_size.height * line_num / lines.size(); 131 | int middle = image_size.height * (line_num + 0.5) / lines.size(); 132 | int bottom = image_size.height * (line_num + 1) / lines.size(); 133 | if ( 134 | bbox.y >= top && bbox.y + bbox.height <= bottom && 135 | abs((bbox.y + bbox.y + bbox.height) / 2 - middle) < abs(image_size.height / (3 * lines.size())) 136 | ) { 137 | found = true; 138 | break; 139 | } 140 | } 141 | if (found) { 142 | lines[line_num].push_back(bbox); 143 | } else { 144 | indeterminate.push_back(bbox); 145 | } 146 | }); 147 | } 148 | 149 | static float confidence_type(const Size &image_size, 150 | vector > &lines, unsigned int chars_per_line, 151 | const vector &char_bboxes, vector &indeterminate) 152 | { 153 | if (char_bboxes.size() < lines.size() * chars_per_line / 2) { 154 | return 0; // Less than 50% characters recognised 155 | } 156 | assign_to_lines(image_size, char_bboxes, lines, indeterminate); 157 | if (indeterminate.size() > char_bboxes.size() / 5) { 158 | return 0; // More than 20% of characters not aligned 159 | } 160 | unsigned int num_aligned = 0; 161 | for (unsigned int line_num = 0; line_num < lines.size(); line_num++) { 162 | if (lines[line_num].size() > chars_per_line) { 163 | return 0; // Line too long 164 | } 165 | num_aligned += lines[line_num].size(); 166 | } 167 | return static_cast(num_aligned) 168 | / static_cast(lines.size() * chars_per_line); 169 | } 170 | 171 | /** 172 | * Forcible assign the previously indeterminate bounding rectangles 173 | * to whichever of the given lines of char bboxes they are closest to. 174 | */ 175 | void assign_indeterminate(vector &indeterminate, vector > &lines) 176 | { 177 | vector average_line_midpoints; 178 | for_each(lines.begin(), lines.end(), [&average_line_midpoints](const vector &line) { 179 | unsigned int m = 0; 180 | for_each(line.begin(), line.end(), [&m](const Rect &r) { 181 | m += r.y + r.height / 2; 182 | }); 183 | average_line_midpoints.push_back(m / line.size()); 184 | }); 185 | #if 0 186 | for_each(average_line_midpoints.begin(), average_line_midpoints.end(), [](unsigned int average_line_midpoint) { 187 | cerr << "Average line midpoint: " << average_line_midpoint << endl; 188 | }); 189 | #endif 190 | for_each(indeterminate.begin(), indeterminate.end(), [&lines, average_line_midpoints](const Rect &r) { 191 | unsigned int i = 0; 192 | int smallest_voffset = -1; 193 | unsigned int closest_line_idx = 0; 194 | for_each(average_line_midpoints.begin(), average_line_midpoints.end(), [r, &i, &smallest_voffset, &closest_line_idx](unsigned int average_line_midpoint) { 195 | int voffset = std::abs(r.y + r.height / 2 - static_cast(average_line_midpoint)); 196 | if (-1 == smallest_voffset || voffset < smallest_voffset) { 197 | smallest_voffset = voffset; 198 | closest_line_idx = i; 199 | } 200 | i++; 201 | }); 202 | lines[closest_line_idx].push_back(r); 203 | }); 204 | } 205 | 206 | static void fixup_missing_chars(const Mat &image, vector > &lines, 207 | MRZ &mrz) 208 | { 209 | unsigned int num_expected = mrz.getLineCount() * mrz.getCharsPerLine(); 210 | unsigned int num_found = 0; 211 | for_each(lines.begin(), lines.end(), [&num_found](vector &line) { 212 | // cerr << "Chars this line: " << line.size() << endl; 213 | num_found += line.size(); 214 | }); 215 | if (num_found < num_expected) { 216 | cerr << "Only found " << num_found << " of " << num_expected << " chars. Interpolating." << endl; 217 | } 218 | unsigned int expected_width = image.cols / mrz.getCharsPerLine(); 219 | unsigned int expected_height = image.rows / mrz.getLineCount(); 220 | unsigned int expected_x = 0; 221 | MRZ *pmrz = &mrz; 222 | for_each(lines.begin(), lines.end(), [&num_found, lines, pmrz](vector &line) { 223 | if (lines.size() != pmrz->getCharsPerLine()) { 224 | // unsigned int expected_y = TODO; 225 | for (vector::size_type i = 0; i < line.size(); i++) { 226 | ; 227 | } 228 | } 229 | }); 230 | } 231 | 232 | static void sort_lines(vector > &lines) 233 | { 234 | for_each(lines.begin(), lines.end(), [](vector &line) { 235 | sort(line.begin(), line.end(), [](const Rect &r1, const Rect &r2) { 236 | return r1.x < r2.x; 237 | }); 238 | }); 239 | } 240 | 241 | static bool find_chars( 242 | const Mat &image, 243 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 244 | Mat &draw_image, 245 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 246 | vector > &lines 247 | ) 248 | { 249 | assert(image.size() == draw_image.size()); 250 | Rect borders = find_borders(image); 251 | Mat cropped = image(borders); 252 | cropped = 255 - cropped; 253 | #if 0 && defined(DISPLAY_INTERMEDIATE_IMAGES) 254 | display_image("Inverted cropped ROI", cropped); 255 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 256 | vector bboxes; 257 | find_character_bboxes(cropped, borders, bboxes); 258 | // cerr << "Bbox count: " << bboxes.size() << endl; 259 | #if 0 && defined(DISPLAY_INTERMEDIATE_IMAGES) 260 | for_each(bboxes.begin(), bboxes.end(), [&draw_image, borders](const Rect &bbox) { 261 | rectangle(draw_image, bbox, Scalar(0, 0, 255)); 262 | }); 263 | display_image("Char bboxes", draw_image); 264 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 265 | MRZ *chosen_mrz = NULL; 266 | MRZType1 mrz1; 267 | MRZType2 mrz2; 268 | MRZType3 mrz3; 269 | vector indeterminate_type_1; 270 | vector > lines_type_1( 271 | mrz1.getLineCount()); 272 | float conf_type_1 = confidence_type(cropped.size(), lines_type_1, mrz1.getCharsPerLine(), bboxes, 273 | indeterminate_type_1); 274 | vector indeterminate_type_2; 275 | vector > lines_type_2( 276 | mrz2.getLineCount()); 277 | float conf_type_2 = confidence_type(cropped.size(), lines_type_2, mrz2.getCharsPerLine(), bboxes, 278 | indeterminate_type_2); 279 | vector indeterminate_type_3; 280 | vector > lines_type_3( 281 | mrz3.getLineCount()); 282 | float conf_type_3 = confidence_type(cropped.size(), lines_type_3, mrz3.getCharsPerLine(), bboxes, 283 | indeterminate_type_3); 284 | if (conf_type_1 > max({ conf_type_2, conf_type_3, 0.75f })) { 285 | cerr << "Looks like type 1" << endl; 286 | chosen_mrz = &mrz1; 287 | lines = lines_type_1; 288 | assign_indeterminate(indeterminate_type_1, lines); 289 | } else if (conf_type_2 > max({ conf_type_1, conf_type_3, 0.75f })) { 290 | cerr << "Looks like type 2" << endl; 291 | chosen_mrz = &mrz2; 292 | lines = lines_type_2; 293 | assign_indeterminate(indeterminate_type_2, lines); 294 | } else if (conf_type_3 > max({ conf_type_1, conf_type_2, 0.75f })) { 295 | cerr << "Looks like type 3" << endl; 296 | chosen_mrz = &mrz3; 297 | lines = lines_type_3; 298 | assign_indeterminate(indeterminate_type_3, lines); 299 | } else { 300 | cerr << "Indeterminate type: " << conf_type_1 << " confidence Type 1, " 301 | << conf_type_2 << " confidence Type 2, " 302 | << conf_type_3 << " confidence Type 3" << endl; 303 | } 304 | 305 | if (NULL == chosen_mrz) { 306 | return false; 307 | } 308 | 309 | sort_lines(lines); 310 | fixup_missing_chars(cropped, lines, *chosen_mrz); 311 | 312 | return true; 313 | } 314 | 315 | static void process(Mat &original) 316 | { 317 | Mat roiImage; 318 | if (!find_mrz(original, roiImage)) { 319 | cerr << "No MRZ found" << endl; 320 | return; 321 | } 322 | #if 0 && defined(DISPLAY_INTERMEDIATE_IMAGES) 323 | display_image("ROI", roiImage); 324 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 325 | Mat roi_grey; 326 | cvtColor(roiImage, roi_grey, COLOR_BGR2GRAY); 327 | #if 1 328 | Mat roi_thresh; 329 | threshold(roi_grey, roi_thresh, 0, 255, THRESH_BINARY | THRESH_OTSU); 330 | #if 0 && defined(DISPLAY_INTERMEDIATE_IMAGES) 331 | display_image("ROI threshold", roi_thresh); 332 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 333 | #endif 334 | #ifdef USE_TESSERACT 335 | vector buf; 336 | imencode(".bmp", roi_thresh, buf); 337 | string data_dir = getcwd(); 338 | data_dir.append("/tessdata"); 339 | cerr << "data dir: " << data_dir << endl; 340 | RecogniserTesseract tess("eng", &data_dir[0], MRZ::charset); 341 | tess.set_image_bmp(&buf[0]); 342 | tess.ocr(); 343 | #elif defined(USE_K_NEAREST) 344 | vector > lines; 345 | if (find_chars(roi_thresh, lines)) { 346 | string text; 347 | RecogniserKNearest recogniser(TRAINING_DATA_FILENAME); 348 | recogniser.recognise_lines(roiImage, lines, text); 349 | cerr << "Recognised text: " << text << endl; 350 | #if 0 || defined(DISPLAY_INTERMEDIATE_IMAGES) 351 | display_image("Original", original); 352 | #endif /* 1 || DISPLAY_INTERMEDIATE_IMAGES */ 353 | } 354 | #else /* !defined(USE_TESSERACT) && !defined(USE_K_NEAREST) */ 355 | vector > lines; 356 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 357 | Mat drawImage = roiImage.clone(); 358 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 359 | if (find_chars( 360 | roi_thresh, 361 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 362 | drawImage, 363 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 364 | lines 365 | ) 366 | ) { 367 | string text; 368 | RecogniserAbsDiff recogniser(MRZ::charset, "OCRB"); 369 | recogniser.recognise(roi_grey, lines, text); 370 | cerr << "Recognised text: " << text << endl; 371 | } 372 | #endif /* ndef USE_TESSERACT */ 373 | } 374 | 375 | static int process_cmdline_args(int argc, char *argv[]) 376 | { 377 | char **arg; 378 | int ret = EXIT_SUCCESS; 379 | 380 | for (arg = &argv[1]; arg < &argv[argc]; arg++) { 381 | Mat input = imread(*arg); 382 | if (input.data) { 383 | process(input); 384 | } else { 385 | cerr << "Failed to load image from " << *arg << endl; 386 | ret = EXIT_FAILURE; 387 | break; 388 | } 389 | } 390 | 391 | return ret; 392 | } 393 | 394 | int train(void) 395 | { 396 | // cout << getBuildInformation() << endl; 397 | Mat img = imread("ocrb.png"); 398 | SlidingWindowCapture image_source(img, Size(70, 115), Point(70 + 2)); 399 | RecogniserKNearest::learnOcr(image_source, MRZ::charset, 400 | TRAINING_DATA_FILENAME); 401 | 402 | return EXIT_SUCCESS; 403 | } 404 | 405 | int main(int argc, char *argv[]) 406 | { 407 | log4cpp::Appender *consoleAppender = new log4cpp::OstreamAppender("console", 408 | &std::cerr); 409 | log4cpp::Category& root = log4cpp::Category::getRoot(); 410 | root.setPriority(log4cpp::Priority::getPriorityValue("DEBUG")); 411 | consoleAppender->setLayout(new log4cpp::SimpleLayout()); 412 | root.addAppender(consoleAppender); 413 | // train(); 414 | return process_cmdline_args(argc, argv); 415 | } 416 | -------------------------------------------------------------------------------- /examples/passport_01.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/examples/passport_01.jpg -------------------------------------------------------------------------------- /examples/passport_02.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/examples/passport_02.jpg -------------------------------------------------------------------------------- /examples/passport_03.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/examples/passport_03.jpg -------------------------------------------------------------------------------- /examples/passport_04.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/examples/passport_04.jpg -------------------------------------------------------------------------------- /examples/passport_05.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/examples/passport_05.jpg -------------------------------------------------------------------------------- /examples/passport_06.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/examples/passport_06.jpg -------------------------------------------------------------------------------- /find_mrz.cpp: -------------------------------------------------------------------------------- 1 | #include "find_mrz.h" 2 | 3 | using namespace cv; 4 | 5 | bool find_mrz(const Mat &original, Mat &mrz) 6 | { 7 | // initialize a rectangular and square structuring kernel 8 | Mat rectKernel = getStructuringElement(MORPH_RECT, Size(13, 5)); 9 | Mat sqKernel = getStructuringElement(MORPH_RECT, Size(21, 21)); 10 | 11 | // resize the image and convert it to grayscale 12 | Mat image; 13 | resize(original, image, Size(original.size().width * 600 / original.size().height, 600)); 14 | Mat gray; 15 | cvtColor(image, gray, COLOR_BGR2GRAY); 16 | 17 | // smooth the image using a 3x3 Gaussian, then apply the blackhat 18 | // morphological operator to find dark regions on a light background 19 | GaussianBlur(gray, gray, Size(3, 3), 0); 20 | Mat blackhat; 21 | morphologyEx(gray, blackhat, MORPH_BLACKHAT, rectKernel); 22 | 23 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 24 | display_image("Blackhat", blackhat); 25 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 26 | 27 | // compute the Scharr gradient of the blackhat image and scale the 28 | // result into the range [0, 255] 29 | Mat gradX; 30 | Sobel(blackhat, gradX, CV_32F, 1, 0, -1); 31 | gradX = abs(gradX); 32 | double minVal, maxVal; 33 | minMaxIdx(gradX, &minVal, &maxVal); 34 | Mat gradXfloat = (255 * ((gradX - minVal) / (maxVal - minVal))); 35 | gradXfloat.convertTo(gradX, CV_8UC1); 36 | 37 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 38 | display_image("Gx", gradX); 39 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 40 | 41 | // apply a closing operation using the rectangular kernel to close 42 | // gaps in between letters -- then apply Otsu's thresholding method 43 | morphologyEx(gradX, gradX, MORPH_CLOSE, rectKernel); 44 | Mat thresh; 45 | threshold(gradX, thresh, 0, 255, THRESH_BINARY | THRESH_OTSU); 46 | 47 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 48 | display_image("Horizontal closing", thresh); 49 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 50 | 51 | // perform another closing operation, this time using the square 52 | // kernel to close gaps between lines of the MRZ, then perform a 53 | // series of erosions to break apart connected components 54 | morphologyEx(thresh, thresh, MORPH_CLOSE, sqKernel); 55 | Mat nullKernel; 56 | erode(thresh, thresh, nullKernel, Point(-1, -1), 4); 57 | 58 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 59 | display_image("Vertical closing", thresh); 60 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 61 | 62 | // during thresholding, it's possible that border pixels were 63 | // included in the thresholding, so let's set 5% of the left and 64 | // right borders to zero 65 | double p = image.size().height * 0.05; 66 | thresh = thresh(Rect(p, p, image.size().width - 2 * p, image.size().height - 2 * p)); 67 | 68 | #ifdef DISPLAY_INTERMEDIATE_IMAGES 69 | display_image("Border removal", thresh); 70 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 71 | 72 | // find contours in the thresholded image and sort them by their 73 | // size 74 | vector > contours; 75 | findContours(thresh, contours, RETR_EXTERNAL, 76 | CHAIN_APPROX_SIMPLE); 77 | // Sort the contours in decreasing area 78 | sort(contours.begin(), contours.end(), [](const vector& c1, const vector& c2){ 79 | return contourArea(c1, false) > contourArea(c2, false); 80 | }); 81 | 82 | // Find the first contour with the right aspect ratio and a large width relative to the width of the image 83 | Rect roiRect(0, 0, 0, 0); 84 | vector >::iterator border_iter = find_if(contours.begin(), contours.end(), [&roiRect, gray](vector &contour) { 85 | // compute the bounding box of the contour and use the contour to 86 | // compute the aspect ratio and coverage ratio of the bounding box 87 | // width to the width of the image 88 | roiRect = boundingRect(contour); 89 | // dump_rect("Bounding rect", roiRect); 90 | // pprint([x, y, w, h]) 91 | double aspect = (double) roiRect.size().width / (double) roiRect.size().height; 92 | double coverageWidth = (double) roiRect.size().width / (double) gray.size().height; 93 | // cerr << "aspect=" << aspect << "; coverageWidth=" << coverageWidth << endl; 94 | // check to see if the aspect ratio and coverage width are within 95 | // acceptable criteria 96 | if (aspect > 5 and coverageWidth > 0.5) { 97 | return true; 98 | } 99 | return false; 100 | }); 101 | 102 | if (border_iter == contours.end()) { 103 | return false; 104 | } 105 | 106 | // Correct ROI for border removal offset 107 | roiRect += Point(p, p); 108 | // pad the bounding box since we applied erosions and now need 109 | // to re-grow it 110 | int pX = (roiRect.x + roiRect.size().width) * 0.03; 111 | int pY = (roiRect.y + roiRect.size().height) * 0.03; 112 | roiRect -= Point(pX, pY); 113 | roiRect += Size(pX * 2, pY * 2); 114 | // Ensure ROI is within image 115 | roiRect &= Rect(0, 0, image.size().width, image.size().height); 116 | // Make it relative to original image again 117 | float scale = static_cast(original.size().width) / static_cast(image.size().width); 118 | roiRect.x *= scale; 119 | roiRect.y *= scale; 120 | roiRect.width *= scale; 121 | roiRect.height *= scale; 122 | mrz = original(roiRect); 123 | 124 | #if 0 || defined(DISPLAY_INTERMEDIATE_IMAGES) 125 | // Draw a bounding box surrounding the MRZ 126 | Mat display_roi = original.clone(); 127 | rectangle(display_roi, roiRect, Scalar(0, 255, 0), 2); 128 | display_image("MRZ detection results", display_roi); 129 | #endif /* DISPLAY_INTERMEDIATE_IMAGES */ 130 | 131 | return true; 132 | } 133 | -------------------------------------------------------------------------------- /find_mrz.h: -------------------------------------------------------------------------------- 1 | #ifndef FIND_MRZ_H 2 | #define FIND_MRZ_H 1 3 | 4 | #include 5 | 6 | bool find_mrz(const cv::Mat &original, cv::Mat &mrz); 7 | 8 | #endif /* FIND_MRZ_H */ 9 | -------------------------------------------------------------------------------- /mrz.cpp: -------------------------------------------------------------------------------- 1 | #include "mrz.h" 2 | 3 | const std::string MRZ::charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789<"; 4 | -------------------------------------------------------------------------------- /mrz.h: -------------------------------------------------------------------------------- 1 | #ifndef MRZ_H 2 | #define MRZ_H 1 3 | 4 | #include 5 | #include 6 | 7 | class MRZ { 8 | public: 9 | MRZ(void) {}; 10 | virtual ~MRZ() {}; 11 | static unsigned int getMinCharsPerLine(void) { return 30; } 12 | static unsigned int getMaxCharsPerLine(void) { return 44; } 13 | static unsigned int getMinLineCount(void) { return 2; } 14 | static unsigned int getMaxLineCount(void) { return 3; } 15 | virtual unsigned int getCharsPerLine(void) const = 0; 16 | virtual unsigned int getLineCount(void) const = 0; 17 | static const std::string charset; 18 | }; 19 | 20 | class MRZType1 : public MRZ { 21 | public: 22 | virtual unsigned int getCharsPerLine(void) const { return 30; }; 23 | virtual unsigned int getLineCount(void) const { return 3; }; 24 | }; 25 | 26 | class MRZType2 : public MRZ { 27 | public: 28 | virtual unsigned int getCharsPerLine(void) const { return 36; }; 29 | virtual unsigned int getLineCount(void) const { return 2; }; 30 | }; 31 | 32 | class MRZType3 : public MRZ { 33 | public: 34 | virtual unsigned int getCharsPerLine(void) const { return 44; }; 35 | virtual unsigned int getLineCount(void) const { return 2; }; 36 | }; 37 | 38 | #endif /* MRZ_H */ 39 | -------------------------------------------------------------------------------- /ocrb.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/ocrb.png -------------------------------------------------------------------------------- /tessdata/eng.traineddata: -------------------------------------------------------------------------------- 1 | ../../PassportScanner/tessdata/eng.traineddata -------------------------------------------------------------------------------- /test_data/mrz_example_01.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/test_data/mrz_example_01.jpg -------------------------------------------------------------------------------- /test_data/mrz_example_02.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/test_data/mrz_example_02.jpg -------------------------------------------------------------------------------- /test_data/mrz_example_03.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/test_data/mrz_example_03.jpg -------------------------------------------------------------------------------- /test_data/mrz_example_04.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/test_data/mrz_example_04.jpg -------------------------------------------------------------------------------- /test_data/mrz_example_05.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/test_data/mrz_example_05.jpg -------------------------------------------------------------------------------- /test_data/mrz_example_06.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/developer79433/passport_mrz_detector_cpp/71aaf3d58fe21d8154f69fff8390f9df020f9c81/test_data/mrz_example_06.jpg --------------------------------------------------------------------------------