content: package org.superboot.utils;
  
  import javax.imageio.ImageIO;
  import java.awt.*;
  import java.awt.image.BufferedImage;
  import java.io.*;
  import java.util.ArrayList;
  
  /**
   * <b> 图片内容识别工具类 </b>
   * <p>
   * 功能描述: 识别依赖tesseract 项目组件，请提前安装后使用图片识别功能
   * </p>
   */
  public class OCRUtils {
  
  
      private final String LANG_OPTION = "-l";
      private final String EOL = System.getProperty("line.separator");
      /**
       * 文件位置我防止在，项目同一路径
       */
      private String tessPath = new File("tesseract").getAbsolutePath();
  
      /**
       * @param imageFile 传入的图像文件
       * @return 识别后的字符串
       */
      public String recognizeText(File imageFile) throws Exception {
          /**
           * 设置输出文件的保存的文件目录
           */
          File outputFile = new File(imageFile.getParentFile(), "output");
  
          StringBuffer strB = new StringBuffer();
          ArrayList<String> cmd = new ArrayList<String>();
  
          cmd.add(tessPath + "\\tesseract");
          cmd.add("");
          cmd.add(outputFile.getName());
          cmd.add(LANG_OPTION);
  //      cmd.add("chi_sim");
          cmd.add("eng");
  
          ProcessBuilder pb = new ProcessBuilder();
          /**
           *Sets this process builder's working directory.
           */
          pb.directory(imageFile.getParentFile());
          cmd.set(1, imageFile.getName());
          pb.command(cmd);
          pb.redirectErrorStream(true);
          Process process = pb.start();
          // tesseract.exe 1.jpg 1 -l chi_sim
          // Runtime.getRuntime().exec("tesseract.exe 1.jpg 1 -l chi_sim");
          /**
           * the exit value of the process. By convention, 0 indicates normal
           * termination.
           */
  //      System.out.println(cmd.toString());
          int w = process.waitFor();
          if (w == 0)// 0代表正常退出
          {
              BufferedReader in = new BufferedReader(new InputStreamReader(
                      new FileInputStream(outputFile.getAbsolutePath() + ".txt"),
                      "UTF-8"));
              String str;
  
              while ((str = in.readLine()) != null) {
                  strB.append(str).append(EOL);
              }
              in.close();
          } else {
              String msg;
              switch (w) {
                  case 1:
                      msg = "Errors accessing files. There may be spaces in your image's filename.";
                      break;
                  case 29:
                      msg = "Cannot recognize the image or its selected region.";
                      break;
                  case 31:
                      msg = "Unsupported image format.";
                      break;
                  default:
                      msg = "Errors occurred.";
              }
              throw new RuntimeException(msg);
          }
          new File(outputFile.getAbsolutePath() + ".txt").delete();
          return strB.toString().replaceAll("\\s*", "");
      }
  
      /**
       * @param sfile   需要去噪的图像
       * @param destDir 去噪后的图像保存地址
       * @throws IOException
       */
      public void 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()));
      }
  
      public boolean isBlack(int colorInt) {
          Color color = new Color(colorInt);
          if (color.getRed() + color.getGreen() + color.getBlue() <= 300) {
              return true;
          }
          return false;
      }
  
      public boolean isWhite(int colorInt) {
          Color color = new Color(colorInt);
          if (color.getRed() + color.getGreen() + color.getBlue() > 300) {
              return true;
          }
          return false;
      }
  
      public int isBlackOrWhite(int colorInt) {
          if (getColorBright(colorInt) < 30 || getColorBright(colorInt) > 730) {
              return 1;
          }
          return 0;
      }
  
      public int getColorBright(int colorInt) {
          Color color = new Color(colorInt);
          return color.getRed() + color.getGreen() + color.getBlue();
      }
  
      public int ostu(int[][] gray, int w, int h) {
          int[] histData = new int[w * h];
          // Calculate histogram
          for (int x = 0; x < w; x++) {
              for (int y = 0; y < h; y++) {
                  int red = 0xFF & gray[x][y];
                  histData[red]++;
              }
          }
  
          // Total number of pixels
          int total = w * h;
  
          float sum = 0;
          for (int t = 0; t < 256; t++) {
              sum += t * histData[t];
          }
  
          float sumB = 0;
          int wB = 0;
          int wF = 0;
  
          float varMax = 0;
          int threshold = 0;
  
          for (int t = 0; t < 256; t++) {
              wB += histData[t]; // Weight Background
              if (wB == 0) {
                  continue;
  
              }
  
              wF = total - wB; // Weight Foreground
              if (wF == 0) {
                  break;
              }
  
              sumB += (float) (t * histData[t]);
  
              float mB = sumB / wB; // Mean Background
              float mF = (sum - sumB) / wF; // Mean Foreground
  
              // Calculate Between Class Variance
              float varBetween = (float) wB * (float) wF * (mB - mF) * (mB - mF);
  
              // Check if new maximum found
              if (varBetween > varMax) {
                  varMax = varBetween;
                  threshold = t;
              }
          }
  
          return threshold;
      }
  
      public static void main(String[] args) {
          try {
  
              File testDataDir = new File("testdata");
              System.out.println(testDataDir.listFiles().length);
              int i = 0;
              for (File file : testDataDir.listFiles()) {
                  i++;
                  String recognizeText = new OCRUtils().recognizeText(file);
                  System.out.print(recognizeText + "\t");
  
                  if (i % 5 == 0) {
                      System.out.println();
                  }
              }
  
          } catch (Exception e) {
              e.printStackTrace();
          }
  
      }
  
  }
  