ImageCompare.java

package com.opslab.util.image;

import org.apache.log4j.Logger;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;

/**
 * 图片比较
 */
public final class ImageCompare {
    private static Logger logger = Logger.getLogger(ImageCompare.class);

    /**
     * 改变成二进制码
     *
     * @param file
     * @return
     */
    public static String[][] getPX(File file) {
        int[] rgb = new int[3];

        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;

    }

    /**
     * 比较俩个图片的相似度
     *
     * @param image1
     * @param image2
     * @return
     */
    public static float compareImage(File image1, File image2) {
        String[][] list1 = getPX(image1);
        String[][] list2 = getPX(image2);
        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(image1);
        list2 = getPX(image2);
        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";
        }
        logger.debug("相似像素数量：" + xiangsi + " 不相似像素数量：" + busi + " 相似率：" + Integer.parseInt(baifen) + "%");
        return Integer.parseInt(baifen);


    }
}