package com.whyc.util;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.IOException;
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public class ImageDiff {
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//不同的像素标记为红色
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public static final int RGB_RED = 16711680;
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//public static final int RGB2 = 02550;
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//允许的Red，Green，Blue单个维度的像素差值
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public static final int DIFF_ALLOW_RANGE = 0;
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//public static final int DIFF_ALLOW_RANGE = 125;
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//不同像素点统计值
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public static int diffPointCount = 0;
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//从rgb值中抽取red
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public static int getRed(int rgbValue) {
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return rgbValue & 0xff0000 >> 16;
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}
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//从rgb值中抽取green
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public static int getGreen(int rgbValue) {
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return rgbValue & 0xff00 >> 8;
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}
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//从rgb值中抽取blue
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public static int getBlue(int rgbValue) {
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return rgbValue & 0xff;
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}
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/**
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* 修改BufferedImage中的图片尺寸，以便和源图片进行比较
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*
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* @param image
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* @param newHeight
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* @param newWidth
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* @return
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*/
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public static BufferedImage changeImageSize(BufferedImage image, int newHeight, int newWidth) {
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Image img = image.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH);
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int width = img.getWidth(null);
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int height = img.getHeight(null);
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//获取新图片的BufferedImage实例
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BufferedImage newBufferedImage = new BufferedImage(width, height,
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BufferedImage.TYPE_INT_ARGB);
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Graphics g = newBufferedImage.getGraphics();
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g.drawImage(img, 0, 0, null);
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g.dispose();
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return newBufferedImage;
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}
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/**
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* 比较两图片，并用红色标出不同的像素点，然后保存差异图片到本地，打印匹配率
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*
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* @param srcImgPath
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* @param targetImgPath
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*/
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public static ByteArrayOutputStream compareImages(String srcImgPath, String targetImgPath) throws IOException {
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try {
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BufferedImage srcImg = ImageIO.read(new File(srcImgPath));
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BufferedImage targetImg = ImageIO.read(new File(targetImgPath));
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diffPointCount = 0;
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BufferedImage diffImg = srcImg;
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int srcHeight = srcImg.getHeight();
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int srcWidth = srcImg.getWidth();
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//修改待比较图片的尺寸以适应源图片的尺寸
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targetImg = changeImageSize(targetImg, srcHeight, srcWidth);
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/*int w2 = 554;
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int h2 = 487;
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int srcRgb2;
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int targetRgb2;
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srcRgb2 = srcImg.getRGB(w2, h2);
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targetRgb2 = targetImg.getRGB(w2, h2);
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int red = getRed(srcRgb2);
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int red1 = getRed(targetRgb2);
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int green = getGreen(srcRgb2);
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int green1 = getGreen(targetRgb2);
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int blue = getBlue(srcRgb2);
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int blue1 = getBlue(targetRgb2);
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if (Math.abs(red - red1) > DIFF_ALLOW_RANGE ||
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Math.abs(green - green1) > DIFF_ALLOW_RANGE ||
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Math.abs(blue - blue1) > DIFF_ALLOW_RANGE) {
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diffImg.setRGB(w2, h2, RGB_RED);
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}*/
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int srcRgb;
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int targetRgb;
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for (int h = 0; h < srcHeight; h++) {
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for (int w = 0; w < srcWidth; w++) {
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srcRgb = srcImg.getRGB(w, h);
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targetRgb = targetImg.getRGB(w, h);
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/*if (Math.abs(getRed(srcRgb) - getRed(targetRgb)) > DIFF_ALLOW_RANGE ||
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Math.abs(getGreen(srcRgb) - getGreen(targetRgb)) > DIFF_ALLOW_RANGE ||
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Math.abs(getBlue(srcRgb) - getBlue(targetRgb)) > DIFF_ALLOW_RANGE) {
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diffImg.setRGB(w, h, RGB_RED);
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diffPointCount++;
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}
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}*/
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if (Math.abs(targetRgb - srcRgb) > DIFF_ALLOW_RANGE) {
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diffImg.setRGB(w, h, RGB_RED);
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}
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diffPointCount++;
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}
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}
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//保存差异图片
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ByteArrayOutputStream bs = new ByteArrayOutputStream();
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//ImageOutputStream imOut = ImageIO.createImageOutputStream(bs);
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//ImageIO.write(diffImg, "png", new File("diffImg.png"));
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ImageIO.write(diffImg,"png",bs);
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/*//计算相似度(保留小数点后四位)
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int totalPixel = srcHeight * srcWidth;
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DecimalFormat decimalFormat = new DecimalFormat("#.####");
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double matchRate = (totalPixel - diffPointCount) / (totalPixel * 1.0);
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System.out.println("图片相似度为： " + decimalFormat.format(matchRate) + "%");*/
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return bs;
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} catch(Exception ex){
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ex.printStackTrace();
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return null;
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}
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}
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public static void main(String[] args) throws IOException {
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compareImages("C:\\\\Users\\\\29550\\\\Desktop\\\\当前项目\\\\202207图纸管理\\\\图纸升级\\\\fbo-60010nt-t-j-002_a11-dwg.png",
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"C:\\\\Users\\\\29550\\\\Desktop\\\\当前项目\\\\202207图纸管理\\\\图纸升级\\\\fbo-60010nt-t-j-002_a12-dwg.png");
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}
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}
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