C#图像处理之图像均值方差计算的方法

本文实例讲述了C#图像处理之图像均值方差计算的方法。分享给大家供大家参考。具体如下：

//本函数均是基于RGB颜色空间计算
//定义图像均值函数（RGB空间）
public double AnBitmap(Bitmap a)
{
 double V = 0;
 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);
 unsafe
 {
  byte* pIn = (byte*)bmpData.Scan0.ToPointer();
  byte* P;
  int R, G, B;
  double meanvalue = 0, sum = 0;
  int stride = bmpData.Stride;
  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];
    sum += B * 0.114 + G * 0.587 + R * 0.299;
    pIn += 3;
    }
    pIn += stride - a.Width * 3;
  }
  meanvalue = sum / (a.Width * a.Height);
  V = meanvalue;
 }
 a.UnlockBits(bmpData);
 return V;  //返回图像均值V
}
//定义图像统计方差函数（RGB空间）
public double AnCONBitmap(Bitmap a,double meanvalue)
{
 double V = 0;
 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);
 unsafe
 {
  byte* pIn = (byte*)bmpData.Scan0.ToPointer();
  byte* P;
  int R, G, B;
  double conv = 0, sum = 0;
  int stride = bmpData.Stride;
  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];
    sum += (B * 0.114 + G * 0.587 + R * 0.299 - meanvalue) * (B * 0.114 + G * 0.587 + R * 0.299 - meanvalue);
    pIn += 3;
    }
    pIn += stride - a.Width * 3;
   }
   conv = sum / (a.Width * a.Height-1);
  V = conv;
 }
 a.UnlockBits(bmpData);
 return V;  //返回图像方差V
}

希望本文所述对大家的C#程序设计有所帮助。