Win8Metro(C#)数字图像处理--2.26图像减法

原文:Win8Metro(C#)数字图像处理--2.26图像减法



[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]