WPF：图像处理（二）灰度化(3)

            Int32 PixelWidth = bitmap.PixelWidth;   // 图像宽度 
            Int32 Stride = PixelWidth << 2;         // 扫描行跨距 
            Byte[] Pixels = new Byte[PixelHeight * Stride]; 
            if (bitmap.Format == PixelFormats.Bgr32 || bitmap.Format == PixelFormats.Bgra32) 
            {   // 拷贝像素数据 
                bitmap.CopyPixels(Pixels, Stride, 0); 
            } 
            else 
            {   // 先进行像素格式转换，再拷贝像素数据 
                new FormatConvertedBitmap(bitmap, PixelFormats.Bgr32, null, 0).CopyPixels(Pixels, Stride, 0); 
            } 
 
            // 将像素数据转换为灰度数组 
            Byte[,] GrayArray = new Byte[PixelHeight, PixelWidth]; 
            for (Int32 i = 0; i < PixelHeight; i++) 
            { 
                for (Int32 j = 0; j < PixelWidth; j++) 
                { 
                    Int32 Index = i * Stride + (j << 2);                     
                    GrayArray[i, j] = Convert.ToByte((Pixels[Index + 2] * 19595 + Pixels[Index + 1] * 38469 + Pixels[Index] * 7471 + 32768) >> 16); 
                } 
            } 
 
            return GrayArray; 
        } 
 
        /// <summary>