检测两张图片相似程度

原理: 相似图片搜索的原理

代码

package org.linxinboy.utils

{

import flash.display.BitmapData;

import flash.geom.Matrix;

 

/**

* 2014.4.12

* @author linxinboy

*/

public class BitmapUtil

{

/**

* 返回两张图片的相似度   0 - 100   越高越相似

*/

public static function compare(src0:BitmapData, src1:BitmapData):int

{

var str0:String = hashBitmap(src0);

var str1:String = hashBitmap(src1);

trace(str0);

trace(str1);

var diff:uint = 0;

for(var i:int = 0; i<str0.length; i++)

{

if(str0.charAt(i) != str1.charAt(i))

{

diff++;

}

}

 

return (64 - diff)/64 * 100;

}

 

public static function hashBitmap(src:BitmapData):String

{

var bmd:BitmapData = new BitmapData(8, 8);

var w:int = src.width;

var h:int = src.height;

var scale:Number = w > h ? w/8 : h/8;

bmd.draw(src, new Matrix(1/scale, 0, 0, 1/scale));

var ave:uint = 0;

var colorList:Vector. = new Vector.();

for(var i:int = 0; i < 8; i++)

{

for(var j:int = 0; j < 8; j++)

{

var color:uint = bmd.getPixel(i, j);

var r:uint = (color >> 16) & 0xFF;

var g:uint = (color >> 8) & 0xFF;

var b:uint = color & 0xFF;

color = (r * 0.3 + g * 0.59 + b * 0.11)/4;

bmd.setPixel(i, j, (color << 16) | (color << 8) | color);

ave += color;

colorList.push(color);

}

}

ave /= 64;

var str:String = "";

for(i = 0; i<colorList.length; i++)

{

if(colorList[i] >= ave)

{

colorList[i] = 1;

}

else

colorList[i] = 0;

str += colorList[i];

}

return str;

}

}

}