import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
/**
 * 比較兩張圖片的相似度
 * @author Guihua
 *
 */
public class BMPLoader {
  // 改變成二進(jìn)制碼
  public static String[][] getPX(String args) {
    int[] rgb = new int[3];
    File file = new File(args);
    BufferedImage bi = null;
    try {
      bi = ImageIO.read(file);
    } catch (Exception e) {
      e.printStackTrace();
    }
    int width = bi.getWidth();
    int height = bi.getHeight();
    int minx = bi.getMinX();
    int miny = bi.getMinY();
    String[][] list = new String[width][height];
    for (int i = minx; i < width; i++) {
      for (int j = miny; j < height; j++) {
        int pixel = bi.getRGB(i, j);
        rgb[0] = (pixel & 0xff0000) >> 16;
        rgb[1] = (pixel & 0xff00) >> 8;
        rgb[2] = (pixel & 0xff);
        list[i][j] = rgb[0] + "," + rgb[1] + "," + rgb[2];
      }
    }
    return list;
  }
  public static void compareImage(String imgPath1, String imgPath2){
    String[] images = {imgPath1, imgPath2};
    if (images.length == 0) {
      System.out.println("Usage >java BMPLoader ImageFile.bmp");
      System.exit(0);
    }
    // 分析圖片相似度 begin
    String[][] list1 = getPX(images[0]);
    String[][] list2 = getPX(images[1]);
    int xiangsi = 0;
    int busi = 0;
    int i = 0, j = 0;
    for (String[] strings : list1) {
      if ((i + 1) == list1.length) {
        continue;
      }
      for (int m=0; m<strings.length; m++) {
        try {
          String[] value1 = list1[i][j].toString().split(",");
          String[] value2 = list2[i][j].toString().split(",");
          int k = 0;
          for (int n=0; n<value2.length; n++) {
            if (Math.abs(Integer.parseInt(value1[k]) - Integer.parseInt(value2[k])) < 5) {
              xiangsi++;
            } else {
              busi++;
            }
          }
        } catch (RuntimeException e) {
          continue;
        }
        j++;
      }
      i++;
    }
    list1 = getPX(images[1]);
    list2 = getPX(images[0]);
    i = 0;
    j = 0;
    for (String[] strings : list1) {
      if ((i + 1) == list1.length) {
        continue;
      }
      for (int m=0; m<strings.length; m++) {
        try {
          String[] value1 = list1[i][j].toString().split(",");
          String[] value2 = list2[i][j].toString().split(",");
          int k = 0;
          for (int n=0; n<value2.length; n++) {
            if (Math.abs(Integer.parseInt(value1[k]) - Integer.parseInt(value2[k])) < 5) {
              xiangsi++;
            } else {
              busi++;
            }
          }
        } catch (RuntimeException e) {
          continue;
        }
        j++;
      }
      i++;
    }
    String baifen = "";
    try {
      baifen = ((Double.parseDouble(xiangsi + "") / Double.parseDouble((busi + xiangsi) + "")) + "");
      baifen = baifen.substring(baifen.indexOf(".") + 1, baifen.indexOf(".") + 3);
    } catch (Exception e) {
      baifen = "0";
    }
    if (baifen.length() <= 0) {
      baifen = "0";
    }
    if(busi == 0){
      baifen="100";
    }
    System.out.println("相似像素數(shù)量：" + xiangsi + " 不相似像素數(shù)量：" + busi + " 相似率：" + Integer.parseInt(baifen) + "%");
  }
  public static void main(String[] args){
    BMPLoader.compareImage("E:\\12.bmp", "E:\\1.bmp");
  }
}