C＃CDF 5/3小波 - 值始终为255

Question

我正在尝试实施Cohen-Daubechies-Feauveau-Wavelet 5/3高通和低通。

我现在正在坚持。我的输出图像始终为白色，因为在计算过程中所有值都变为255。很难找到这种小波的任何例子。有没有人在我的计算中看到我无法找到的错误。

static double[] lowpass = {1/8d, 2/8d, 6/8d, 2/8d, -1/8};
static double[] highpass = {1/2d, 1d, -1/2d };

    public static void lowPassFilter(Bitmap img)
    {
        int index = 0;
        double R = 0.0, G = 0.0, B = 0.0;

        Bitmap filteredImg = img;

        // Iterate over each pixel
        for (int x = 0; x < filteredImg.Width; x++)
        {
            for (int y = 0; y < filteredImg.Height; y++)
            {

                // Apply filter in x direction
                for (int i = 0; i < lowpass.Length; i++)
                {
                    index = Math.Min(Math.Max(x - (lowpass.Length / 2) + i, 0), filteredImg.Width - 1);

                    R += img.GetPixel(index, y).R * lowpass[i];
                    G += img.GetPixel(index, y).G * lowpass[i];
                    B += img.GetPixel(index, y).B * lowpass[i];
                }

                R = Math.Min(Math.Max(R, 0), 255);
                G = Math.Min(Math.Max(G, 0), 255);
                B = Math.Min(Math.Max(B, 0), 255);

                filteredImg.SetPixel(x, y, Color.FromArgb((int)R, (int)G, (int)B));
            }
        }