JAVA 比较两张图片的相似度
原文：http://liuguihua0823.iteye.com/blog/1178118#bc2395917
import java.awt.image.BufferedImage;import java.io.File;
import javax.imageio.ImageIO;
/**
* 比较两张图片的相似度
* @author Guihua
*
*/
public class BMPLoader {
// 改变成二进制码
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);
}
// 分析图片相似度 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("相似像素数量：" + xiangsi + " 不相似像素数量：" + busi + " 相似率：" + Integer.parseInt(baifen) + "%");
}
public static void main(String[] args){
BMPLoader.compareImage("E:\\12.bmp", "E:\\1.bmp");
}
}
package com.rd.p2p.additional.redisCaptcha.util;import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import com.octo.captcha.service.CaptchaServiceException;
import com.rd.p2p.common.util.jcaptcha.CaptchaServiceSingleton;
public class ResponseUtil {
private static Logger logger= Logger.getLogger(ResponseUtil.class);
public static boolean sendMessageNoCache(HttpServletResponse response, String message) {
response.setContentType("text/html;charset=UTF-8");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "no-store");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
StringBuffer sb = new StringBuffer();
try {
PrintWriter writer = response.getWriter();
sb.append(message);
writer.write(sb.toString());
response.flushBuffer();
return true;
} catch (Exception e) {
logger.error("直接推送字符串错误", e);
return false;
}
}
public static boolean sendJSON(HttpServletResponse response, Object obj){
response.setContentType("text/json;charset=UTF-8");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "no-store");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
StringBuffer sb = new StringBuffer();
try {
PrintWriter writer = response.getWriter();
sb.append(JSONUtil.toJSON(obj));
writer.write(sb.toString());
response.flushBuffer();
return true;
} catch (Exception e) {
logger.error("直接推送JSON数据错误", e);
return false;
}
}
public static boolean sendJSONP(HttpServletResponse response, String callBack, Object obj){
response.setContentType("application/javascript;charset=UTF-8");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "no-store");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
StringBuffer sb = new StringBuffer();
try {
PrintWriter writer = response.getWriter();
sb.append(JSONUtil.toJSONP(callBack, obj));
writer.write(sb.toString());
response.flushBuffer();
return true;
} catch (Exception e) {
logger.error("直接推送JSONP数据错误", e);
return false;
}
}
public static void sendImg(HttpServletResponse response, BufferedImage buffImg, String mimeType, String fileName, String extName) throws IOException {
// OutputStream out= null;
// response.setContentType(mimeType);
// response.setHeader("Content-Disposition", String.format("attachment;filename=%s.%s", fileName, extName));
// try {
// out= response.getOutputStream();
// ImageIO.write(buffImg, extName, out);
//// BufferedInputStream buffIn= new BufferedInputStream(in);
//// BufferedOutputStream buffOut= new BufferedOutputStream(out);
//// byte buff[]= new byte[4096];//申请缓冲区
//// int size= buffIn.read(buff);//初始化读取缓冲
//// while (size!= -1) {
//// buffOut.write(buff, 0, size);//输出缓冲数据
//// size= buffIn.read(buff);//继续读取数据
//// }
//// buffIn.close();//关闭输入流
//// buffOut.flush();//清空输出流
//// buffOut.close();//关闭输出流
// return true;
// } catch (IOException e) {
// logger.error("直接推送图片错误", e);
// return false;
// }
response.setHeader("Cache-Control", "no-store");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
ServletOutputStream out = response.getOutputStream();
try {
// String captchaId = request.getSession(true).getId();
// LOGGER.info("当前生产验证码的sessionId为: "+captchaId);
// BufferedImage challenge = (BufferedImage) CaptchaServiceSingleton.getInstance().getChallengeForID(
// captchaId, request.getLocale());
ImageIO.write(buffImg, "jpg", out);
out.flush();
} catch (CaptchaServiceException e) {
} finally {
out.close();
}
}
}
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