C#数字图象处理之肤色检测的方法

本文实例讲述了c#数字图象处理之肤色检测的方法。分享给大家供大家参考。具体如下：

//定义肤色检测函数（可供人脸检测等研究使用）
public bitmap skindetect1(bitmap a)
{
  rectangle rect = new rectangle(0, 0, a.width, a.height);
  system.drawing.imaging.bitmapdata bmpdata = a.lockbits(rect, system.drawing.imaging.imagelockmode.readwrite, system.drawing.imaging.pixelformat.format24bpprgb);
  int stride = bmpdata.stride;
  unsafe
  {
   byte* pin = (byte*)bmpdata.scan0.topointer();
   byte* p;
   int r, g, b;
   double r, g, fupr,flor,wrg;
   for (int y = 0; y < a.height; y++)
   {
     for (int x = 0; x < a.width; x++)
     {
     p = pin;
     b = p[0];
     g = p[1];
     r = p[2];
     if (r + g + b == 0)
     {
       r = 0;
       g = 0;
     }
     else
     {
       r = (r / (r + g + b));
       g = (g / (r + g + b));
     }
     fupr = (1.0743 * r + 0.1452-1.3767 * r * r) ;
     flor = (0.5601 * r + 0.1766-0.776 * r * r);
     wrg = (r - 0.33) * (r - 0.33) + (g - 0.33) * (g - 0.33);  
     if ((r - g >= 45) && ((r > g) && (g > b)) && (fupr > g) && (wrg >= 0.0004))
     {
        p[0] = (byte)b;
        p[1] = (byte)g;
        p[2] = (byte)r;  
     }
     else
     {
       p[0] = 0;
       p[1] = 0;
       p[2] = 0;
     }
     pin += 3;
     
     }
     pin += stride - a.width * 3;
   }
  }
  a.unlockbits(bmpdata);
  return a;
}

效果图像：

希望本文所述对大家的c#程序设计有所帮助。