java圖片比較算法

CompareUtil.java

package com.example.testwebview;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.util.Log;

import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;

public class CompareUtil {
    public static Boolean StepCheckResult (Bitmap bm_one, Bitmap bm_two) throws IOException {
        int t = 0;
        int f = 0;
        //截取當前屏幕
        //ExcuteOperation.getScreen(checkPoint);
        /*File sdDir = Environment.getExternalStorageDirectory();
        //當前截屏文件保存位置sdPath
        String sdPath = sdDir.toString()+"/AutomaticTest/imageCompare/"+checkPoint;
        String cpPath = sdDir.toString()+"/AutomaticTest/imageCompare_standard/"+checkPoint;
        //把圖片轉換爲Bitmap
        Bitmap bm_one = BitmapFactory.decodeFile(sdPath);
        Bitmap bm_two = BitmapFactory.decodeFile(cpPath);
        System.out.println(sdPath);
        System.out.println(cpPath);
        System.out.println("轉換成bitmap成功");*/
        //保存圖片所有像素個數的數組，圖片寬×高
        int[] pixels_one = new int[bm_one.getWidth()*bm_one.getHeight()];
        int[] pixels_two = new int[bm_two.getWidth()*bm_two.getHeight()];
        //獲取每個像素的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());
        //如果圖片一個像素大於圖片2的像素，就用像素少的作爲循環條件。避免報錯
        if (pixels_one.length >= pixels_two.length) {
            //對每一個像素的RGB值進行比較
            for(int i = 0; i < pixels_two.length; i++){
                int clr_one = pixels_one[i];
                int clr_two = pixels_two[i];
                //RGB值一樣就加一（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++;
                }
            }

        }
        if(myPercent(t,t+f)){
            System.out.println("true****");
        }
        else{
            System.out.println("false!!!!");
        }
        return myPercent(t,t+f);

    }
    /**
     * 百分比的計算
     * @author xupp
     * @param y(母子)
     * @param z（分子）
     * @return 百分比（保留小數點後兩位）
     */
    public static boolean myPercent(int y,int z)
    {
        String similarPercent="";//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，後面不足2位的用0補齊
        similarPercent= df1.format(fen);
        System.out.println("Similarity is: "+similarPercent);
        Log.d("huasong", "similarPercent:" + similarPercent);
        if (fen == 1.00){
            return true;
        }
        else{
            return false;
        }
    }

}

MainActivity.java

package com.example.testwebview;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebView;

import java.io.IOException;
import java.security.NoSuchAlgorithmException;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.mipmap.a1);
        Bitmap bitmap2 = BitmapFactory.decodeResource(getResources(), R.mipmap.a1);
//        try {
//            Log.d("huasong", "bitmap:"+bitmap1.toString());
//            Log.d("huasong", "bitmap:"+MD5.getMD5(bitmap1.toString()));
//            Log.d("huasong", "bitmap1:"+MD5.getMD5(bitmap2.toString()));
//        } catch (NoSuchAlgorithmException e) {
//            e.printStackTrace();
//        }

        //BMPLoader.compareImage(bitmap1,bitmap2);
        //Log.d("huasong", "bitmap:"+ SimilarPicture.getAvg(bitmap1));

        long begin = System.currentTimeMillis();
        Log.d("huasong", "begin:" + begin);
        try {
            CompareUtil.StepCheckResult(bitmap1,bitmap2);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Log.d("huasong", "cost:" + (System.currentTimeMillis() - begin) + " ms");

    }
}