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。