├── 1.jpg
├── 2.jpg
├── 3.jpg
├── test_1.jpg
├── test_2.jpg
├── test_3.jpg
├── package.json
├── README.md
└── index.js


/1.jpg:
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https://raw.githubusercontent.com/think2011/node-ocr-demo/HEAD/1.jpg


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/2.jpg:
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https://raw.githubusercontent.com/think2011/node-ocr-demo/HEAD/2.jpg


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/3.jpg:
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https://raw.githubusercontent.com/think2011/node-ocr-demo/HEAD/3.jpg


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/test_1.jpg:
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https://raw.githubusercontent.com/think2011/node-ocr-demo/HEAD/test_1.jpg


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/test_2.jpg:
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https://raw.githubusercontent.com/think2011/node-ocr-demo/HEAD/test_2.jpg


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/test_3.jpg:
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https://raw.githubusercontent.com/think2011/node-ocr-demo/HEAD/test_3.jpg


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/package.json:
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 1 | {
 2 |   "name": "demo",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "main": "index.js",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1"
 8 |   },
 9 |   "author": "",
10 |   "license": "ISC",
11 |   "dependencies": {
12 |     "gm": "^1.21.1",
13 |     "node-tesseract": "^0.2.7"
14 |   }
15 | }
16 | 


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/README.md:
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 1 | # node-ocr-demo
 2 | 用 node.js 配合 tesseract 和 graphicsmagick 实现验证码识别
 3 | 
 4 | > 这是 [用node.js实现验证码简单识别](http://think2011.net/2016/01/31/node-ocr/) 的demo。
 5 | 
 6 | ## 安装
 7 | 需要先安装 [node-tesseract](https://github.com/desmondmorris/node-tesseract) 和 [gm](https://github.com/aheckmann/gm)，然后还要安装他们各自的依赖(对，就是这么麻烦 ╮(╯_╰)╭)
 8 | 
 9 | ## 执行
10 | 在 node.js v4+ 环境下，执行 `node index.js` 即可看到结果。
11 | 


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/index.js:
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 1 | var fs        = require('fs');
 2 | var tesseract = require('node-tesseract');
 3 | var gm        = require('gm');
 4 | 
 5 | processImg('1.jpg', 'test_1.jpg')
 6 |     .then(recognizer)
 7 |     .then(text => {
 8 |         console.log(`识别结果:${text}`);
 9 |     })
10 |     .catch((err)=> {
11 |         console.error(`识别失败:${err}`);
12 |     });
13 | 
14 | /**
15 |  * 处理图片为阈值图片
16 |  * @param imgPath
17 |  * @param newPath
18 |  * @param [thresholdVal=55] 默认阈值
19 |  * @returns {Promise}
20 |  */
21 | function processImg (imgPath, newPath, thresholdVal) {
22 |     return new Promise((resolve, reject) => {
23 |         gm(imgPath)
24 |             .threshold(thresholdVal || 55)
25 |             .write(newPath, (err)=> {
26 |                 if (err) return reject(err);
27 | 
28 |                 resolve(newPath);
29 |             });
30 |     });
31 | }
32 | 
33 | /**
34 |  * 识别图片
35 |  * @param imgPath
36 |  * @param options tesseract options
37 |  * @returns {Promise}
38 |  */
39 | function recognizer (imgPath, options) {
40 |     options = Object.assign({psm: 7}, options);
41 | 
42 |     return new Promise((resolve, reject) => {
43 |         tesseract
44 |             .process(imgPath, options, (err, text) => {
45 |                 if (err) return reject(err);
46 |                 resolve(text.replace(/[\r\n\s]/gm, ''));
47 |             });
48 |     });
49 | }


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