【WPF学习手记】图像模糊：高斯算子

WPF图像处理系列，高斯算子进行图像模糊。

•  原图和效果图

• 代码： 

        // 模糊：高斯算子
        public static ImageSource GrayDataToImageBlur(this ushort[,] grayData, int[,] colorMap, int maxValue = 65535)
        {
            int width = grayData.GetLength(0);    // 行数
            int height = grayData.GetLength(1);   // 列数
            int[] Gauss = new int[9] { 1, 2, 1, 2, 4, 2, 1, 2, 1 };   // 高斯算子
            WriteableBitmap writeableBitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Bgr32, null);
            Int32Rect rect = new Int32Rect(0, 0, width, height);
            byte[] pixels = new byte[width * height * writeableBitmap.Format.BitsPerPixel / 8];
            int gray, r, g, b, index;
            for (int i = 1; i < width - 1; i++)
            {
                for (int j = 1; j < height - 1; j++)
                {
                    gray = 0;
                    index = 0;
                    int pixelOffset = (i + j * width) * writeableBitmap.Format.BitsPerPixel / 8;
                    for (int col = -1; col <= 1; col++)
                    {
                        for (int row = -1; row <= 1; row++)
                        {
                            gray = gray + grayData[i + row, j + col] * Gauss[index];
                            index = index + 1;
                        }
                    }
                    gray = gray / 16;
                    r = colorMap[gray * 255 / maxValue, 0];
                    g = colorMap[gray * 255 / maxValue, 1];
                    b = colorMap[gray * 255 / maxValue, 2];
                    pixels[pixelOffset] = (byte)b;
                    pixels[pixelOffset + 1] = (byte)g;
                    pixels[pixelOffset + 2] = (byte)r;
                    pixels[pixelOffset + 3] = 255;
                }
            }
            int stride = (width * writeableBitmap.Format.BitsPerPixel) / 8;
            writeableBitmap.WritePixels(rect, pixels, stride, 0);
            return writeableBitmap;
        }