Win8Metro(C#)数字图像处理--2.26图像减法

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[函数名称]

图像减法函数SubtractionProcess(WriteableBitmap src, WriteableBitmap subSrc)

[算法说明]

 图像减法就是将两幅图像对应像素值进行减法运算，这里要求两幅图像大小最好相同。

 算法过程如下：

[函数代码]

       ///<summary>

       /// Subtraction of two images(Both of them should be in same size).

       ///</summary>

       ///<param name="src">The first source image.</param>

       ///<param name="subSrc">The second source image.</param>

       ///<returns></returns>

       publicstaticWriteableBitmap SubtractionProcess(WriteableBitmap src,WriteableBitmap subSrc)26图像减法

       {

           if (src !=null)

           {

               int w = src.PixelWidth;

               int h = src.PixelHeight;

               WriteableBitmap subImage =newWriteableBitmap(w, h);

               byte[] temp = src.PixelBuffer.ToArray();

               byte[] subTemp = subSrc.PixelBuffer.ToArray();

               byte[] dst =newbyte[w * h * 4];

               for (int i = 0; i < w; i++)

               {

                   for (int j = 0; j < h; j++)

                   {

                       dst[i * 4 + j * w * 4] = (byte)Math .Abs(temp[i * 4 + (h - 1 - j) * w * 4] - subTemp[i * 4 + (h - 1 - j) * w * 4]);

                       dst[i * 4 + 1 + j * w * 4] = (byte)Math .Abs(temp[i * 4 + 1 + (h - 1 - j) * w * 4] - subTemp[i * 4 + 1 + (h - 1 - j) * w * 4]);

                       dst[i * 4 + 2 + j * w * 4] = (byte)Math .Abs(temp[i * 4 + 2 + (h - 1 - j) * w * 4] - subTemp[i * 4 + 2 + (h - 1 - j) * w * 4]);

                       dst[i * 4 + 3 + j * w * 4] = 0;

                   }

               }

               Stream sTemp = subImage.PixelBuffer.AsStream();

               sTemp.Seek(0, SeekOrigin.Begin);

               sTemp.Write(dst, 0, w * 4 * h);

               return subImage;

           }

           else

           {

               returnnull;

           }     

       }

[图像效果]

 

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