Accord.Math.Wavelets.CDF97.FWT97 C# (CSharp) Method

        public static double[,] FWT97(double[,] data, int levels)
        {
            int w = data.GetLength(0);
            int h = data.GetLength(1);

            for (int i = 0; i < levels; i++)
            {
                fwt2d(data, w, h);
                fwt2d(data, w, h);
                w >>= 1;
                h >>= 1;
            }

            return data;
        }