比较两个位图在ActionScript 3 [英] Compare two Bitmaps in ActionScript 3

问题描述

我有两个类似的BitmapData，我想对它们进行比较，并得​​到多少百分比是他们相似。 （我想我应该使用比较（）和的BitmapData的阈值（）方法，但不知道怎么做）（或者简单地使用getPixel和比较每个像素的像素，但我不知道这是否是性能好）

I have two similar BitmapData and I want to compare them and get what percentage are they similar. (I suppose i should use compare() and threshold() method of BitmapData but don't know how) (or maybe simply use getPixel and compare pixel per pixel but I don't know if it is good for performance)

推荐答案

下面是一个使用比较和getVector，假设两个位图数据对象是相同的宽度和高度的一个简单的方法：

Here is a simple approach using compare and getVector, assuming the two bitmap data objects are the same width and height :

var percentDifference:Number = getBitmapDifference(bitmapData1, bitmapData2);

private function getBitmapDifference(bitmapData1:BitmapData, bitmapData2:BitmapData):Number 
{
    var bmpDataDif:BitmapData = bitmapData1.compare(bitmapData2) as BitmapData;
    if(!bmpDataDif)
        return 0;
    var differentPixelCount:int = 0;

    var pixelVector:Vector.<uint> =  bmpDataDif.getVector(bmpDataDif.rect);
    var pixelCount:int = pixelVector.length;

    for (var i:int = 0; i < pixelCount; i++) 
    {
        if (pixelVector[i] != 0)
            differentPixelCount ++;
    }

    return (differentPixelCount / pixelCount)*100;
}

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