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package com.xupp.sxjiesuo;
import java.text.DecimalFormat;
import android.R.integer;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
/**
* Android图片对比(像素精准对比),速度较慢建议用多线程获取
* @author xupp
* @createData 2013-7-18
*/
public class PictureContrast {
private static int t = 0;
private static int f = 0;
public static String similarity (String url_one,String url_two) {
//把图片转换为Bitmap
Bitmap bm_one = BitmapFactory.decodeFile(url_one);
Bitmap bm_two = BitmapFactory.decodeFile(url_two);
//保存图片所有像素个数的数组,图片宽×高
int[] pixels_one = new int[bm_one.getWidth()*bm_one.getHeight()];
int[] pixels_two = new int[bm_two.getWidth()*bm_two.getHeight()];
//获取每个像素的RGB值
bm_one.getPixels(pixels_one,0,bm_one.getWidth(),0,0,bm_one.getWidth(),bm_one.getHeight());
bm_two.getPixels(pixels_two,0,bm_two.getWidth(),0,0,bm_two.getWidth(),bm_two.getHeight());
//如果图片一个像素大于图片2的像素,就用像素少的作为循环条件。避免报错
if (pixels_one.length >= pixels_two.length) {
//对每一个像素的RGB值进行比较
for(int i = 0; i < pixels_two.length; i++){
int clr_one = pixels_one[i];
int clr_two = pixels_two[i];
//RGB值一样就加一(以便算百分比)
if (clr_one == clr_two) {
t++;
}else {
f++;
}
}
}else {
for(int i = 0; i < pixels_one.length; i++){
int clr_one = pixels_one[i];
int clr_two = pixels_two[i];
if (clr_one == clr_two) {
t++;
}else {
f++;
}
}
}
return "相似度为:"+myPercent(t,t+f);
}
/**
* 百分比的计算
* @author xupp
* @param y(母子)
* @param z(分子)
* @return 百分比(保留小数点后两位)
*/
public static String myPercent(int y,int z)
{
String baifenbi="";//接受百分比的值
double baiy=y*1.0;
double baiz=z*1.0;
double fen=baiy/baiz;
DecimalFormat df1 = new DecimalFormat("00.00%"); //##.00% 百分比格式,后面不足2位的用0补齐
baifenbi= df1.format(fen);
return baifenbi;
}
}