原文:Win8Metro(C#)数字图像处理--2.10图像中值滤波
[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);
}
