两张图片相似度比较

来源：互联网发布：iphone7plus在线软件编辑：程序博客网时间：2024/05/01 16:29
package  {import flash.display.BitmapData;import flash.geom.Matrix;public class HashClass {public function HashClass() {// constructor code}//返回值就是相似度 public function compareBitmapData(bmpData1:BitmapData,bmpData2:BitmapData):Number{var str1 =  process(bmpData1);var str2 =  process(bmpData2);var arr1:Array = str1.split("");var arr2:Array = str2.split("");  var diffCount:int=0;  for(var i1:int=0; i1<64;i1++){ if(arr1[i1]==arr2[i1]){diffCount=diffCount+1;}   } return diffCount/64; }public static function process(bmpData:BitmapData):String{//processing the image//   trace("Start processing...\n");//scaling and convertingvar resizedData:BitmapData = reduceSize(bmpData,8,8);//转换为灰度var greyBmp:BitmapData = reduceColor(resizedData);//计算灰度平均值var avgGrey:uint = calcAvgGrey(greyBmp);  //trace("Average GreyScale：0x"+avgGrey.toString(16)+"\n");//比较灰度值与平均值，建立哈希指纹var hashArr:Array = calcAvgHash(greyBmp, avgGrey);//   trace("hashArr: ",hashArr.join(""));return hashArr.join("");}  public static function reduceSize(source:BitmapData,width:Number = 8, height:Number=8):BitmapData{var newData:BitmapData = new BitmapData(width,height);var matrix:Matrix = new Matrix();//缩小至 8x8matrix.scale(newData.width/source.width, newData.height/source.height);newData.draw(source,matrix); return newData;} public static function reduceColor(source:BitmapData):BitmapData{var result:BitmapData = new BitmapData(source.width,source.height);for(var i:int = 0; i < source.height; i++){for(var j:uint = 0; j < source.width; j++){                        var color:uint = source.getPixel(i, j);                        var red:uint = (color & 0xFF0000) >> 16;var green:uint = (color & 0x00FF00) >> 8;var blue:uint = (color & 0x0000FF) >> 0;//trace(red+"+"+green+"+"+blue);//var bwColor:uint = (red + green + blue) / 3;var bwColor:uint = (red * 30 + green * 59 + blue * 11) / 100;// puts the average in each channelbwColor = (bwColor << 16) + (bwColor << 8) + bwColor; result.setPixel(i, j, bwColor);    }  }  return result;} public static function calcAvgGrey(bmpData:BitmapData):uint{var vecGrey:Vector.<uint> = bmpData.getVector(bmpData.rect);var total:uint = 0;var length:uint = vecGrey.length;for(var i:int = 0; i< length;i++){total += (vecGrey[i] & 0x00FFFFFF);  }  return uint(total/vecGrey.length);} //计算哈希public static function calcAvgHash(bmpData:BitmapData, avgValue:uint):Array {var vecGrey:Vector.<uint>  = bmpData.getVector(bmpData.rect);var length:uint = vecGrey.length;var hashArr:Array = [];for(var i:int = 0; i< length;i++) {//ARGB 32位数据,只取RGBvar pxColor:uint = vecGrey[i] & 0x00FFFFFF;//是否小于灰度均值，小于记0，否则记0var value:uint =  pxColor > avgValue ? 0:1;hashArr.push(value);  }  return hashArr;}}}
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