• 使用tesseract识别图片(主要用于验证码)


    tesseract工具需要设置两个环境变量:Path 和TESSDATA_PREFIX ,变量值都是tesseract的安装目录;

    工具的安装和训练字库:https://www.cnblogs.com/zhongtang/p/5555950.html

    将训练的字库合并:https://blog.csdn.net/woaipangruimao/article/details/78740270

    设置好字符库后需要跟java程序结合:

    1. String temp = "";
      int count = 0;
      do {
       Request request = new Request();
       request.Cookie = "ASP.NET_SessionId=1qestr2g3jvzcvq0yg22ymj1";
       Status status = new Status();
       Response rs = new Response();
       String picUrl = "http://www.afgl.gov.cn/user/login.aspx?AuthCode1$codeText=c705888&___clientRandom=0.8445339654723959";
       URL url = new URL(null);
       url.url = picUrl;
       temp = Download.downloadFile_local(url, request, rs, status,
         "/www/spider.soufun.com/templet/anshan/");
       System.out.println("Path:"+temp);
       File file = new File("/www/spider.soufun.com/templet/anshan/"+(Run.date_dir == null ? "" : Run.date_dir)+temp);
       try {
        cleanImage(file, "/www/spider.soufun.com/templet/anshan/");//处理图片杂色
       } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
       }
       
       File imageFile = new File("/www/spider.soufun.com/templet/anshan/35765be6cd12a1ffbf782012f13db3ac.jpg");
       Tesseract test = new Tesseract();
       test.setDatapath("C:\Program Files (x86)\Tesseract-OCR\tessdata");//训练的字库地址
       test.setLanguage("font");//训练的字库名称
       String result = "";
       try {
        result = test.doOCR(imageFile);
        result = result.replace(" ", "");
        System.out.println(result);
       } catch (TesseractException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
       }
       

    2.

    public static BufferedImage cleanImage(File sfile, String destDir)
       throws IOException {
      File destF = new File(destDir);
      if (!destF.exists()) {
       destF.mkdirs();
      }

      BufferedImage bufferedImage = ImageIO.read(sfile);
      int h = bufferedImage.getHeight();
      int w = bufferedImage.getWidth();

      // 灰度化
      int[][] gray = new int[w][h];
      for (int x = 0; x < w; x++) {
       for (int y = 0; y < h; y++) {
        int argb = bufferedImage.getRGB(x, y);
        // 图像加亮(调整亮度识别率非常高)
        int r = (int) (((argb >> 16) & 0xFF) * 1.1 + 30);
        int g = (int) (((argb >> 8) & 0xFF) * 1.1 + 30);
        int b = (int) (((argb >> 0) & 0xFF) * 1.1 + 30);
        if (r >= 255) {
         r = 255;
        }
        if (g >= 255) {
         g = 255;
        }
        if (b >= 255) {
         b = 255;
        }
        gray[x][y] = (int) Math
          .pow((Math.pow(r, 2.2) * 0.2973 + Math.pow(g, 2.2)
            * 0.6274 + Math.pow(b, 2.2) * 0.0753), 1 / 2.2);
       }
      }

      // 二值化
      int threshold = ostu(gray, w, h);
      BufferedImage binaryBufferedImage = new BufferedImage(w, h,
        BufferedImage.TYPE_BYTE_BINARY);
      for (int x = 0; x < w; x++) {
       for (int y = 0; y < h; y++) {
        if (gray[x][y] > threshold) {
         gray[x][y] |= 0x00FFFF;
        } else {
         gray[x][y] &= 0xFF0000;
        }
        binaryBufferedImage.setRGB(x, y, gray[x][y]);
       }
      }

      // 矩阵打印
      for (int y = 0; y < h; y++) {
       for (int x = 0; x < w; x++) {
        if (isBlack(binaryBufferedImage.getRGB(x, y))) {
         System.out.print("*");
        } else {
         System.out.print(" ");
        }
       }
       System.out.println();
      }

      ImageIO.write(binaryBufferedImage, "jpg", new File(destDir, sfile.getName().replace("Gif", "jpg")));
      return binaryBufferedImage;
     }

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  • 原文地址:https://www.cnblogs.com/srp750115867/p/9229833.html
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