17.3.2.5 灰度（内存处理）

灰度的算法请参看第17.3.1.3节。17.3.1.3 灰度-CSDN博客

【例 17.43】灰度算法一：最大值法。

       //灰度:最大值private void btnGray1_Click(object sender, EventArgs e){Bitmap destImg = new Bitmap(sourceImg.Width, sourceImg.Height);BitmapData sourceData = sourceImg.LockBits(new Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);BitmapData destData = destImg.LockBits(new Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);IntPtr pSource = sourceData.Scan0;int allBytes = sourceData.Stride * sourceData.Height;byte[] rgbvalues = new byte[allBytes];Marshal.Copy(pSource, rgbvalues, 0, allBytes);int pos = 0;int R, G, B;int avgValue;for (int j = 0; j < sourceData.Height; j++){for (int i = 0; i < sourceData.Width; i++){B = rgbvalues[pos];G = rgbvalues[pos + 1];R = rgbvalues[pos + 2];byte MaxColor;MaxColor =(byte)( R > G? R: G);MaxColor = MaxColor > (byte)B ? MaxColor: (byte)B;rgbvalues[pos] = MaxColor;rgbvalues[pos + 1] = MaxColor;rgbvalues[pos + 2] = MaxColor;pos = pos + 3;}pos = pos + sourceData.Stride - sourceData.Width * 3;}IntPtr pDest = destData.Scan0;Marshal.Copy(rgbvalues, 0, pDest, allBytes);sourceImg.UnlockBits(sourceData);destImg.UnlockBits(destData);picDest.Image = destImg;}

【例 17.44】灰度算法二：平均值法。

       //灰度:均值法private void btnGray2_Click(object sender, EventArgs e){Bitmap destImg = new Bitmap(sourceImg.Width, sourceImg.Height);BitmapData sourceData = sourceImg.LockBits(new Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);BitmapData destData = destImg.LockBits(new Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);IntPtr pSource = sourceData.Scan0;int allBytes = sourceData.Stride * sourceData.Height;byte[] rgbvalues = new byte[allBytes];Marshal.Copy(pSource, rgbvalues, 0, allBytes);int pos = 0;int R, G, B;int avgValue;for (int j = 0; j < sourceData.Height; j++){for (int i = 0; i < sourceData.Width; i++){B = rgbvalues[pos];G = rgbvalues[pos + 1];R = rgbvalues[pos + 2];avgValue = (B + G + R) / 3;rgbvalues[pos] = (byte)avgValue;rgbvalues[pos + 1] = (byte)avgValue;rgbvalues[pos + 2] = (byte)avgValue;pos = pos + 3;}pos = pos + sourceData.Stride - sourceData.Width * 3;}IntPtr pDest = destData.Scan0;Marshal.Copy(rgbvalues, 0, pDest, allBytes);sourceImg.UnlockBits(sourceData);destImg.UnlockBits(destData);picDest.Image = destImg;}

【例 17.45】灰度算法三：指数加权法。

       //灰度:指数加权法private void btnGray3_Click(object sender, EventArgs e){Bitmap destImg = new Bitmap(sourceImg.Width, sourceImg.Height);BitmapData sourceData = sourceImg.LockBits(new Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);BitmapData destData = destImg.LockBits(new Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);IntPtr pSource = sourceData.Scan0;int allBytes = sourceData.Stride * sourceData.Height;byte[] rgbvalues = new byte[allBytes];Marshal.Copy(pSource, rgbvalues, 0, allBytes);int pos = 0;int R, G, B;byte y;for (int j = 0; j < sourceData.Height; j++){for (int i = 0; i < sourceData.Width; i++){B = rgbvalues[pos];G = rgbvalues[pos + 1];R = rgbvalues[pos + 2];y =(byte)( R * 0.3 + G * 0.59 + B * 0.11);rgbvalues[pos] = y;rgbvalues[pos + 1] = y;rgbvalues[pos + 2] = y;pos = pos + 3;}pos = pos + sourceData.Stride - sourceData.Width * 3;}IntPtr pDest = destData.Scan0;Marshal.Copy(rgbvalues, 0, pDest, allBytes);sourceImg.UnlockBits(sourceData);destImg.UnlockBits(destData);picDest.Image = destImg;}

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