C#图像处理之头发检测的方法

//发色检测（YCbCr颜色空间）public Bitmap HairD(Bitmap a){  Rectangle rect = new Rectangle(0, 0, a.Width, a.Height);  System.Drawing.Imaging.BitmapData bmpData = a.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format24bppRgb);  int stride = bmpData.Stride;  unsafe  {   byte* pIn = (byte*)bmpData.Scan0.ToPointer();   byte* p;   int R, G, B;   double Cr, Cb,BrightV;   for (int y = 0; y < a.Height; y++)   {     for (int x = 0; x < a.Width; x++)     {     p = pIn;     R = p[2];     G = p[1];     B = p[0];     Cb = 128 - 37.797 * R / 255 - 74.203 * G / 255 + 112 * B / 255;     Cr = 128 + 112 * R / 255 - 93.768 * G / 255 - 18.214 * B / 255;     BrightV = (R + G + B) / 3;     if (!(Cb >= 115 && Cb <= 141 && Cr >= 115 && Cr <= 143 && (R < 35)))     {       pIn[0] = (byte)255;       pIn[1] = (byte)255;       pIn[2] = (byte)255;     }     pIn += 3;     }     pIn += stride - a.Width * 3;   }  }  a.UnlockBits(bmpData);  return a;}//定义最小值函数public double Min(double a, double b, double c){  double e = (a <= b ? a : b) <= c ? (a <= b ? a : b) : c;  return e;}//定义最大值函数public int Max(int a, int b, int c){  int e = (a >= b ? a : b) <= c ? c : (a >= b ? a : b);  return e;}