C#数字图象处理之图像灰度化方法

本文实例讲述了c#数字图象处理之图像灰度化方法。分享给大家供大家参考。具体如下：

//定义图像灰度化函数
private static bitmap pgray(bitmap src)
{
  int w = src.width;
  int h = src.height;
//构建与原图像大小一样的模版图像
  bitmap dstbitmap = new bitmap(src.width, src.height, system.drawing.imaging.pixelformat.format24bpprgb);
//将原图像存入内存
  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];
//调用图像灰度化公式
 pout[0] = pout[1] = pout[2] = (byte)(b * 0.114 + g * 0.587 + r * 0.299);  
 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。