C#数字图像处理之图像二值化（彩色变黑白）的方法

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。