├── LICENSE ├── README.md ├── ascii_art.c ├── ascii_art.h ├── sample.c └── stb_image.h /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. This 15 | General Public License applies to most of the Free Software 16 | Foundation's software and to any other program whose authors commit to 17 | using it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ASCII Art 2 | ### Real-Time ASCII Art Rendering Library - Live demo: https://art.pixlab.io 3 | ### Integration Reference Guide: https://pixlab.io/art 4 | 5 | ASCII Art is a single file C/C++ library that let you transform an input image or video frame into printable ASCII characters at real-time using a single decision tree. Real-time performance is achieved by using pixel intensity comparison inside internal nodes of the tree. 6 | 7 | ### ASCII Camera Now Availabe On Unity Asset Store: https://assetstore.unity.com/packages/slug/165558 8 | 9 | For a general overview on how the algorithm works, check the bottom of the [demo page](https://art.pixlab.io/#algo). 10 | 11 | ![Output](https://i.imgur.com/cdJBzXI.png) 12 | ASCII art is a related (and older) graphic design technique for producing images from printable characters. This implementation is based on the paper: 13 | 14 | >N. Markus, M. Fratarcangeli, I. S. Pandzic and J. Ahlberg, "Fast Rendering of Image Mosaics and ASCII Art", Computer Graphics Forum, 2015, 15 | 16 | 17 | # Getting started 18 | 19 | Embedding the library in your application is straightforward. All you have to do is drop the **ascii_art.c** and its header file in your source tree plus the hex model that can be downloaded [here](https://pixlab.io/art) and perform the following API calls successively: 20 | 21 | 1. Call [AsciiArtInit](https://pixlab.io/art) first to initialize the **ascii_render** structure defined in the **ascii_art.h** header file. 22 | 2. Prepare the image to be processed by converting it to the grayscale colorspace. You can rely on some external library like OpenCV [cvtColor](https://docs.opencv.org/3.1.0/de/d25/imgproc_color_conversions.html) or the built-in [AsciiArtLoadImage](https://pixlab.io/art) interface. 23 | 3. Allocate a buffer big enough to hold the entire ASCII text output. The amount of bytes needed is returned via the [AsciiArtTextBufSize](https://pixlab.io/art) interface. This step is optional if you do not want a text output but instead a binary ASCII glyphs image. 24 | 4. Finally, transform the input image into ASCII glyphs/text via [AsciiArtRender](https://pixlab.io/art). 25 | 26 | Below is a simple C program that demonstrates a typical usage of the ASCII Art C/C++ interfaces. 27 | 28 | ```C 29 | #include "ascii_art.h" 30 | 31 | ascii_render sRender; /* Stack allocated */ 32 | 33 | /* Initialize the render structure */ 34 | AsciiArtInit(&sRender); 35 | 36 | /* Load an image from disk */ 37 | int width, height; 38 | unsigned char *zBlob = AsciiArtLoadImage(argv[1],&width,&height); 39 | if( zBlob == 0 ){ 40 | puts("Cannot load image"); 41 | return; 42 | } 43 | 44 | /* Allocate a buffer big enough to hold the entire text output */ 45 | size_t nBytes = AsciiArtTextBufSize(&sRender, width, height); 46 | unsigned char *zText = malloc(nBytes); 47 | 48 | /* Finally, process */ 49 | AsciiArtRender(&sRender, zBlob, &width, &height, zText,1); 50 | /* zBlob[] hold the binary ASCII glyphs now */ 51 | 52 | /* Output the result */ 53 | fwrite(zText, sizeof(char), nBytes, stdout); 54 | 55 | /* Release memory */ 56 | free(zText); 57 | free(zBlob); 58 | ``` 59 | sample.c [source code](https://github.com/symisc/ascii_art/blob/master/sample.c) 60 | # Resources 61 | * The C/C++ API reference (Only three interfaces are exported plus another optional), the hex model are all available on the official PixLab page at: https://pixlab.io/art 62 | * The live demo: https://art.pixlab.io 63 | * Please report any issue or feature request here on Github. 64 | * Unity Asset Store Package: https://assetstore.unity.com/packages/slug/165558 65 | -------------------------------------------------------------------------------- /ascii_art.c: -------------------------------------------------------------------------------- 1 | /* 2 | * ASCII Art: Real-time ASCII Art Rendering Library. 3 | * Copyright (C) PixLab. https://pixlab.io/art 4 | * Version 1.3 5 | * For information on licensing, redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES 6 | * please contact: 7 | * support@pixlab.io 8 | * contact@pixlab.io 9 | * or visit: 10 | * https://pixlab.io/art 11 | */ 12 | /* 13 | * An Implementation based on the paper: 14 | * > N. Markus, M. Fratarcangeli, I. S. Pandzic and J. Ahlberg, "Fast Rendering of Image Mosaics and ASCII Art", Computer Graphics Forum, 2015, http://dx.doi.org/10.1111/cgf.12597 15 | */ 16 | #include 17 | #include 18 | #include "ascii_art.h" 19 | /* 20 | * This is the output hex model generated during the training phase. 21 | * It contains both the codebook and the decision tree that let you 22 | * render your images or video frames at Real-time. 23 | * 24 | * The model can be downloaded from: https://pixlab.io/art 25 | */ 26 | static const unsigned char zBin[] = { 27 | #include "ascii_art.hex" 28 | }; 29 | /* 30 | * Glyph table. 31 | */ 32 | static const unsigned char glyph_char_table[] = 33 | { 34 | ' ', '!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/', 35 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?', 36 | '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 37 | 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', '\\', ']', '^', '_', 38 | '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 39 | 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~' 40 | }; 41 | /* 42 | * Portion based on the work of Nenad Markus n3ar. 43 | */ 44 | static void parse_art_model(uint8_t** ppixels, int* n, int* nrows, int* ncols, int32_t** tree, const uint8_t pack[]) 45 | { 46 | int i, k; 47 | *n = *(int*)&pack[0 * sizeof(int)]; 48 | *nrows = *(int*)&pack[1 * sizeof(int)]; 49 | *ncols = *(int*)&pack[2 * sizeof(int)]; 50 | k = 3 * sizeof(int); 51 | for (i = 0; i < *n; ++i) { 52 | ppixels[i] = (uint8_t*)&pack[k]; 53 | k = k + *nrows**ncols; 54 | } 55 | *tree = (int32_t*)&pack[k]; 56 | } 57 | #define BINTEST(r, c, t, pixels, ldim) ( (pixels)[((r)*(ldim))+(c)] > (t) ) 58 | /* 59 | * Portion based on the work of Nenad Markus n3ar. 60 | */ 61 | static int get_tree_output(int32_t* tree, uint8_t* pixels, int ldim) 62 | { 63 | uint8_t* n = (uint8_t*)&tree[1]; 64 | int nodeidx = 0; 65 | while (n[0] == 1) /* while we are at a nonterminal node */ 66 | { 67 | 68 | if (0 == BINTEST(n[1], n[2], n[3], pixels, ldim)) 69 | nodeidx = 2 * nodeidx + 1; 70 | else 71 | nodeidx = 2 * nodeidx + 2; 72 | n = (uint8_t*)&tree[1 + nodeidx]; 73 | } 74 | return n[1]; 75 | } 76 | /* 77 | * Portion based on the work of Nenad Markus n3ar. 78 | */ 79 | static void compute_index_matrix(ascii_render *pRender, uint8_t pixels[], int nrows, int ncols, int ldim) 80 | { 81 | int i = 0; 82 | int r, c; 83 | for (r = 0; r < nrows; r += pRender->nRows) { 84 | for (c = 0; c < ncols; c += pRender->nCols) { 85 | if (pRender->pTree) 86 | pRender->zMatrix[i] = get_tree_output(pRender->pTree, &pixels[r*ldim + c], ldim); 87 | else 88 | pRender->zMatrix[i] = 0; 89 | ++i; 90 | } 91 | } 92 | } 93 | /* 94 | * Portion based on the work of Nenad Markus n3ar. 95 | */ 96 | static void rc_clahem(uint8_t imap[], uint8_t img[], int i0, int j0, int i1, int j1, int ldim, uint8_t s) 97 | { 98 | #define NBINS 256 99 | double p[NBINS]; 100 | double P[NBINS]; 101 | 102 | int i, j, k; 103 | int nrows, ncols; 104 | 105 | nrows = i1 - i0 + 1; 106 | ncols = j1 - j0 + 1; 107 | 108 | for (i = 0; i= (double)s / NBINS) 124 | { 125 | double d; 126 | 127 | d = p[k] - (double)s / NBINS; 128 | 129 | p[k] = (double)s / NBINS; 130 | 131 | /* redistribute d */ 132 | for (i = 0; i= I) 178 | i1 = I - 1; 179 | 180 | if (j1 >= J) 181 | j1 = J - 1; 182 | 183 | rc_clahem(imaps[i][j], in, i0, j0, i1, j1, ldim, s); 184 | 185 | ics[i] = (i0 + i1) / 2; 186 | jcs[j] = (j0 + j1) / 2; 187 | } 188 | } 189 | 190 | /* SPECIAL CASE: image corners */ 191 | for (i = 0; inRows) * pRender->nRows; 283 | *ncols = (*ncols / pRender->nCols) * pRender->nCols; 284 | 285 | compute_index_matrix(pRender, pixels, *nrows, *ncols, ldim); 286 | n = 0; 287 | for (r = 0; r < *nrows; r += pRender->nRows) { 288 | for (c = 0; c < *ncols; c += pRender->nCols) { 289 | idx = pRender->zMatrix[n]; 290 | ++n; 291 | glyph = (uint8_t*)&pRender->zGlyphs[idx][0]; 292 | if (zPtr) *zPtr++ = glyph_char_table[idx]; 293 | for (i = 0; i < pRender->nRows; ++i) 294 | for (j = 0; j < pRender->nCols; ++j) 295 | pixels[(r + i)*ldim + (c + j)] = glyph[i*pRender->nCols + j]; 296 | } 297 | if (zPtr) *zPtr++ = '\n'; 298 | } 299 | } 300 | /* 301 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 302 | */ 303 | void AsciiArtInit(ascii_render *pRender) 304 | { 305 | /* memset(pRender, 0, sizeof(ascii_render)); */ 306 | parse_art_model(pRender->zGlyphs, &pRender->nGlyphs, &pRender->nRows, &pRender->nCols, &pRender->pTree, zBin); 307 | } 308 | /* 309 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 310 | */ 311 | unsigned int AsciiArtTextBufSize(ascii_render *pRender, int img_width, int img_height) 312 | { 313 | return img_height / pRender->nRows * (img_width / pRender->nCols + 1) * sizeof(uint8_t); 314 | } 315 | /* 316 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 317 | */ 318 | void AsciiArtRender(ascii_render *pRender, unsigned char *zPixel /*IN/OUT*/, int *pnWidth /*IN/OUT*/, int *pnHeight /*IN/OUT*/, unsigned char *zBuf/* Optional/OUT */, int Optimize) 319 | { 320 | int ncol = *pnWidth; 321 | if (Optimize) { 322 | clahe_preprocess(zPixel, zPixel, *pnHeight, *pnWidth, 8, 8, 3); 323 | } 324 | transform_to_ascii(&(*pRender), zPixel, pnHeight, pnWidth, zBuf); 325 | if (*pnWidth < ncol) { 326 | /* Restore original width */ 327 | *pnWidth = ncol; 328 | } 329 | } 330 | #ifdef ART_ENABLE_STB_IMAGE 331 | #define STB_IMAGE_IMPLEMENTATION 332 | #include "stb_image.h" 333 | /* 334 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 335 | */ 336 | unsigned char * AsciiArtLoadImage(const char * zPath, int * pWidth, int * pHeight) 337 | { 338 | unsigned char *zBlob; 339 | int c; 340 | zBlob = stbi_load(zPath,pWidth, pHeight, &c, 1); 341 | return zBlob; 342 | } 343 | #endif /* STB_IMAGE_IMPLEMENTATION */ 344 | -------------------------------------------------------------------------------- /ascii_art.h: -------------------------------------------------------------------------------- 1 | /* 2 | * ASCII Art: Real-time ASCII Art Rendering Library. 3 | * Copyright (C) PixLab. https://pixlab.io/art 4 | * Version 1.3 5 | * For information on licensing, redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES 6 | * please contact: 7 | * support@pixlab.io 8 | * contact@pixlab.io 9 | * or visit: 10 | * https://pixlab.io/art 11 | */ 12 | /* 13 | * An Implementation based on the paper: 14 | * > N. Markus, M. Fratarcangeli, I. S. Pandzic and J. Ahlberg, "Fast Rendering of Image Mosaics and ASCII Art", Computer Graphics Forum, 2015, http://dx.doi.org/10.1111/cgf.12597 15 | */ 16 | #ifndef __ASCIIART_H__ 17 | #define __ASCIIART_H__ 18 | /* Make sure we can call this stuff from C++ */ 19 | #ifdef __cplusplus 20 | extern "C" { 21 | #endif 22 | 23 | #if defined (_MSC_VER) || defined (__MINGW32__) || defined (__GNUC__) && defined (__declspec) 24 | #define ART_APIEXPORT __declspec(dllexport) 25 | #else 26 | #define ART_APIEXPORT 27 | #endif 28 | #ifndef INDEX_MATRIX_SZ 29 | #define INDEX_MATRIX_SZ 640 * 480 30 | #endif 31 | /* 32 | * Current rendering state and the glyph table is recorded on a instance 33 | * of the following structure. 34 | */ 35 | typedef struct ascii_render ascii_render; 36 | struct ascii_render 37 | { 38 | int nGlyphs; 39 | unsigned char* zGlyphs[256]; 40 | unsigned char zMatrix[INDEX_MATRIX_SZ]; 41 | int nRows; 42 | int nCols; 43 | int* pTree; 44 | }; 45 | /* 46 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 47 | */ 48 | ART_APIEXPORT void AsciiArtInit(ascii_render *pRender); 49 | /* 50 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 51 | */ 52 | ART_APIEXPORT unsigned int AsciiArtTextBufSize(ascii_render *pRender, int img_width, int img_height); 53 | /* 54 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 55 | */ 56 | ART_APIEXPORT void AsciiArtRender(ascii_render *pRender, unsigned char *zPixel /*IN/OUT*/, int *pnWidth /*IN/OUT*/, int *pnHeight /*IN/OUT*/, unsigned char *zBuf/* Optional/OUT */, int Optimize); 57 | 58 | #ifdef ART_ENABLE_STB_IMAGE 59 | /* 60 | * CAPIREF: Refer to the official documentation for the main purpose of this interface. 61 | */ 62 | ART_APIEXPORT unsigned char * AsciiArtLoadImage(const char *zPath, int *pWidth, int *pHeight); 63 | #endif /* ART_ENABLE_STB_IMAGE */ 64 | 65 | #ifdef __cplusplus 66 | } 67 | #endif 68 | #endif /* __ASCIIART_H__ */ 69 | -------------------------------------------------------------------------------- /sample.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Compile this file together with the ASCII Art source code 3 | * to generate the executable. For example: 4 | * 5 | * gcc -W -Wall -O6 ascii_art.c sample.c -o ascii -D ART_ENABLE_STB_IMAGE 6 | * ./ascii test.png 7 | * 8 | * ART_ENABLE_STB_IMAGE directive must be defined in order to load images from disk. 9 | * Otherwise you have to rely on an external library such as OpenCV to load the target images. 10 | * 11 | * If you get a compile-time error, it means that the `ascii_art.hex` model is missing. 12 | * Download it from: https://pixlab.io/art 13 | */ 14 | #include 15 | #include 16 | #include "ascii_art.h" 17 | 18 | int main(int argc, char **argv) { 19 | ascii_render sRender; /* Stack allocated */ 20 | 21 | unsigned char *zText, *zBlob; 22 | int width, height; 23 | unsigned int nBytes; 24 | 25 | if (argc < 2) { 26 | puts("Missing input image"); 27 | return -1; 28 | } 29 | 30 | /* Initialize the render structure */ 31 | AsciiArtInit(&sRender); 32 | 33 | /* Load the target image */ 34 | zBlob = AsciiArtLoadImage(argv[1], &width, &height); 35 | if (zBlob == 0) { 36 | puts("Cannot load image"); 37 | return -1; 38 | } 39 | 40 | /* Allocate a buffer big enough to hold the entire text output */ 41 | nBytes = AsciiArtTextBufSize(&sRender, width, height); 42 | zText = malloc(nBytes); 43 | 44 | /* Finally, process */ 45 | AsciiArtRender(&sRender, zBlob, &width, &height, zText, 1); 46 | 47 | /* Output the result */ 48 | fwrite(zText, sizeof(char), nBytes, stdout); 49 | /* zBlob[] hold the binary ASCII glyphs now */ 50 | 51 | /* Release memory */ 52 | free(zText); 53 | free(zBlob); 54 | 55 | return 0; 56 | } 57 | --------------------------------------------------------------------------------