C#圖象處置之圖象均值方差盤算的辦法

C#圖象處置之圖象均值方差盤算的辦法。本站提示廣大學習愛好者：（C#圖象處置之圖象均值方差盤算的辦法）文章只能為提供參考，不一定能成為您想要的結果。以下是C#圖象處置之圖象均值方差盤算的辦法正文

本文實例講述了C#圖象處置之圖象均值方差盤算的辦法。分享給年夜家供年夜家參考。詳細以下：

//本函數均是基於RGB色彩空間盤算
//界說圖象均值函數（RGB空間）
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;  //前往圖象均值V
}
//界說圖象統計方差函數（RGB空間）
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;  //前往圖象方差V
}

願望本文所述對年夜家的C#法式設計有所贊助。