Win8 Metro(C#)数字图像处理--2.37Wallis图象锐化

你的名字 2021-04-24 02:27 441阅读 0赞

**\[函数名称\]**

Wallis图象锐化        WallisSharpen(WriteableBitmap src)

**\[算法说明\]**

Wallis锐化算法是在拉普拉斯算子的基础上，考虑人的视觉特性中包含一个对数环节，因此在锐化时，采用对数处理的方法进行改进，公式如下：

![Center][]

[函数代码]
 /// <summary>
 /// Wallis sharpen process.
 /// </summary>
 /// <param name="src">The source image.</param>
 /// <returns></returns>
 public static WriteableBitmap WallisSharpen(WriteableBitmap src)37Wallis锐化函数 
 {
 if (src != null)
 {
 int w = src.PixelWidth;
 int h = src.PixelHeight;
 WriteableBitmap sharpenImage = new WriteableBitmap(w, h);
 byte[] temp = src.PixelBuffer.ToArray();
 byte[] tempMask = (byte[])temp.Clone();
 double b = 0, g = 0, r = 0, srR = 0, srG = 0, srB = 0;
 for (int j = 1; j < h - 1; j++)
 {
 for (int i = 4; i < w * 4 - 4; i += 4)
 {
 
 srB = tempMask[i + j * w * 4];
 srG = tempMask[i + 1 + j * w * 4];
 srR = tempMask[i + 2 + j * w * 4];
 b = 46*Math.Abs(5 * Math .Log(srB+1) - Math .Log(tempMask[i - 4 + j * w * 4]+1) - Math .Log(tempMask[i + 4 + j * w * 4]+1) - Math .Log(tempMask[i + (j - 1) * w * 4]+1) - Math .Log(tempMask[i + (j + 1) * w * 4]+1));
 g = 46*Math.Abs(5 * Math .Log(srG+1) - Math .Log(tempMask[i - 4 + 1 + j * w * 4]+1) - Math .Log(tempMask[i + 4 + 1 + j * w * 4]+1) - Math .Log(tempMask[i + 1 + (j - 1) * w * 4]+1) - Math .Log(tempMask[i + 1 + (j + 1) * w * 4]+1));
 r = 46*Math.Abs(5 * Math .Log(srR+1) - Math .Log(tempMask[i - 4 + 2 + j * w * 4]+1) - Math .Log(tempMask[i + 4 + 2 + j * w * 4]+1) - Math .Log(tempMask[i + 2 + (j - 1) * w * 4]+1) - Math .Log(tempMask[i + 2 + (j + 1) * w * 4]+1));
 temp[i + j * w * 4] = (byte)(b > 0 ? (b < 255 ? b : 255) : 0);
 temp[i + 1 + j * w * 4] = (byte)(g > 0 ? (g < 255 ? g : 255) : 0);
 temp[i + 2 + j * w * 4] = (byte)(r > 0 ? (r < 255 ? r : 255) : 0);
 b = 0; g = 0; r = 0; srR = 0; srG = 0; srB = 0;
 }
 }
 Stream sTemp = sharpenImage.PixelBuffer.AsStream();
 sTemp.Seek(0, SeekOrigin.Begin);
 sTemp.Write(temp, 0, w * 4 * h);
 return sharpenImage;
 }
 else
 {
 return null;
 }
 }
 [图象效果]

![Center 1][]

[Center]: /images/20210424/1619231296635.png
[Center 1]: /images/20210424/1619231277182.png