C#数字图像处理之图像二值化（彩色变黑白）的方法

//定义图像二值化函数private static Bitmap PBinary(Bitmap src,int v){ int w = src.Width; int h = src.Height; Bitmap dstBitmap = new Bitmap(src.Width ,src.Height ,System .Drawing .Imaging .PixelFormat .Format24bppRgb ); System.Drawing.Imaging.BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); System.Drawing.Imaging.BitmapData dstData = dstBitmap.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); unsafe {  byte* pIn = (byte*)srcData.Scan0.ToPointer();  byte* pOut = (byte*)dstData.Scan0.ToPointer();  byte* p;  int stride = srcData.Stride;  int r, g, b;  for (int y = 0; y < h; y++)  {  for (int x = 0; x < w; x++)  {   p = pIn;   r = p[2];   g = p[1];   b = p[0];   pOut [0]=pOut [1]=pOut [2]=(byte)(((byte)(0.2125 * r + 0.7154 * g + 0.0721 * b) >= v)   ? 255 : 0);   pIn += 3;   pOut += 3;  }  pIn += srcData.Stride - w * 3;  pOut += srcData.Stride - w * 3;  }  src.UnlockBits(srcData );  dstBitmap.UnlockBits(dstData );  return dstBitmap; }}