[函数名称]
图像中值滤波函数MedianFilterProcess(WriteableBitmap src)
[函数代码]
///<summary>
/// Median filter process.
///</summary>
///<param name="src">Source image.</param>
///<returns></returns>
publicstaticWriteableBitmap MedianFilterProcess(WriteableBitmap src)////10中值滤波处理
{
if(src!=null )
{
int w = src.PixelWidth;
int h = src.PixelHeight;
WriteableBitmap filterImage =newWriteableBitmap(w, h);
byte[] temp = src.PixelBuffer.ToArray();
byte[] tempMask = (byte[])temp.Clone();
int v1 = 0, v2 = 0, v3 = 0, v4 = 0, v5 = 0, v6 = 0, v7 = 0, v8 = 0, t = 0;
for (int j = 1; j < h - 1; j++)
{
for (int i = 4; i < w * 4 - 4; i += 4)
{
v1 = (int)(temp[i - 4 + (j - 1) * w * 4] * 0.114 + temp[i - 4 + 1 + (j - 1) * w * 4] * 0.587 + temp[i - 4 + 2 + (j - 1) * w * 4] * 0.299);
v2 = (int)(temp[i + (j - 1) * w * 4] * 0.114 + temp[i + 1 + (j - 1) * w * 4] * 0.587 + temp[i + 2 + (j - 1) * w * 4] * 0.299);
v3 = (int)(temp[i + 4 + (j - 1) * w * 4] * 0.114 + temp[i + 4 + 1 + (j - 1) * w * 4] * 0.587 + temp[i + 4 + 2 + (j - 1) * w * 4] * 0.299);
v4 = (int)(temp[i - 4 + j * w * 4] * 0.114 + temp[i - 4 + 1 + j * w * 4] * 0.587 + temp[i - 4 + 2 + j * w * 4] * 0.299);
v5 = (int)(temp[i + 4 + j * w * 4] * 0.114 + temp[i + 4 + 1 + j * w * 4] * 0.587 + temp[i + 4 + 2 + j * w * 4] * 0.299);
v6 = (int)(temp[i - 4 + (j + 1) * w * 4] * 0.114 + temp[i - 4 + 1 + (j + 1) *w * 4] * 0.587 + temp[i - 4 + 2 + (j + 1) * w * 4] * 0.299);
v7 = (int)(temp[i + (j + 1) * w * 4] * 0.114 + temp[i + 1 + (j + 1) * w * 4] * 0.587 + temp[i + 2 + (j + 1) * w * 4] * 0.299);
v8 = (int)(temp[i + 4 + (j + 1) * w * 4] * 0.114 + temp[i + 4 + 1 + (j + 1) * w * 4] * 0.587 + temp[i + 4 + 2 + (j + 1) * w * 4] * 0.299);
t = GetMedianValue(v1, v2, v3, v4, v5, v6, v7, v8);
if(t==v1)
{
temp[i + j * w * 4] = (byte)tempMask[i - 4 + (j - 1) * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i - 4 + 1 + (j - 1) * w * 4];
temp[i + 2 + j * w* 4] = (byte)tempMask[i - 4 + 2 + (j - 1) * w * 4];
}
elseif(t==v2)
{
temp[i + j * w * 4] = (byte)tempMask[i + (j - 1) * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i + 1 + (j - 1) * w * 4];
temp[i + 2 + j * w * 4] = (byte)tempMask[i + 2 + (j - 1) * w * 4];
}
elseif(t==v3)
{
temp[i + j * w * 4] = (byte)tempMask[i + 4 + (j - 1) * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i + 1 + 4 + (j - 1) * w * 4];
temp[i + 2 + j * w * 4] = (byte)tempMask[i + 2 + 4 + (j - 1) * w * 4];
}
elseif(t==v4)
{
temp[i + j * w * 4] = (byte)tempMask[i - 4 + j * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i - 4 + 1 + j * w * 4];
temp[i + 2 + j * w * 4] = (byte)tempMask[i - 4 + 2 + j * w * 4];
}
elseif(t==v5)
{
temp[i + j * w * 4] = (byte)tempMask[i + 4 + j * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i + 4 + 1 + j * w * 4];
temp[i + 2 + j * w * 4] = (byte)tempMask[i + 4 + 2 + j * w * 4];
}
elseif(t==v6)
{
temp[i + j * w * 4] = (byte)tempMask[i - 4 + (j + 1) * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i - 4 + 1 + (j + 1) * w * 4];
temp[i + 2 + j * w * 4] = (byte)tempMask[i - 4 + 2 + (j + 1) * w * 4];
}
elseif (t == v7)
{
temp[i + j * w * 4] = (byte)tempMask[i + (j + 1) * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i + 1 + (j + 1) * w * 4];
temp[i + 2 + j * w * 4] = (byte)tempMask[i + 2 + (j + 1) * w * 4];
}
else
{
temp[i + j * w * 4] = (byte)tempMask[i + 4 + (j + 1) * w * 4];
temp[i + 1 + j * w * 4] = (byte)tempMask[i + 4 + 1 + (j + 1) * w * 4];
temp[i + 2 + j * w * 4] = (byte)tempMask[i + 4 + 2 + (j + 1) * w * 4];
}
v1 = 0; v2 = 0; v3 = 0; v4 = 0; v5 = 0; v6 = 0; v7 = 0; v8 = 0; t = 0;
}
}
Stream sTemp = filterImage.PixelBuffer.AsStream();
sTemp.Seek(0,SeekOrigin.Begin);
sTemp.Write(temp, 0, w * 4 * h);
return filterImage;
}
else
{
returnnull;
}
}
privatestaticint GetMedianValue(paramsint[] src)
{
int w = src.Length;
int temp = src[0], m = 0;
for (int i = 1; i < (int)(w / 2); i++)
{
if (src[i] < temp)
{
m = src[i];
src[i] = temp;
temp = m;
}
else
continue;
}
return (int)((src[(int)(w / 2)] + src[(int)(-1 + w / 2)]) / 2);
}
