本文实例讲述了C#数字图像处理之图像二值化（彩色变黑白）的方法。分享给大家供大家参考。具体如下：

//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; }}

希望本文所述对大家的C#程序设计有所帮助。