LitDev.Engines.FIP.ImageFilterGS C# (CSharp) Method

        public Bitmap ImageFilterGS(Bitmap OriginalImage, Double[,] Filter)
        {
            Bitmap image = OriginalImage;
            Bitmap image2 = new Bitmap(image.Width, image.Height);

            if (Filter.GetLength(0) != Filter.GetLength(1))
            {
                throw new Exception("Filter mask must be square.");
            }

            if (Filter.GetLength(0) % 2 == 0)
            {
                throw new Exception("Filter mask dimension must be odd.");
            }

            if (Filter.GetLength(0) < 3)
            {
                throw new Exception("Filter mask dimension must be greater or equal 3.");
            }

            int range = (int)Math.Floor(Convert.ToDouble(Filter.GetLength(0) / 2));

            for (int m = range; m < image.Width - range; m++)
            {
                for (int n = range; n < image.Height - range; n++)
                {

                    Double[,] roi = new Double[Filter.GetLength(0), Filter.GetLength(0)];

                    int tmpi = 0;
                    int tmpj = 0;

                    int newValue = 0;

                    for (int i = m - range; i < m + range + 1; i++)
                    {
                        for (int j = n - range; j < n + range + 1; j++)
                        {
                            Color pixel = image.GetPixel(i, j);
                            Double p = Convert.ToDouble((pixel.R * 0.3) + (pixel.G * 0.59) + (pixel.B * 0.11));

                            roi[tmpi, tmpj] = p;

                            tmpj++;
                        }

                        tmpi++;
                        tmpj = 0;
                    }

                    for (int k = 0; k < Filter.GetLength(0); k++)
                    {
                        for (int l = 0; l < Filter.GetLength(0); l++)
                        {
                            newValue += (int)(roi[k, l] * Filter[k, l]);
                        }
                    }

                    //newValue = (int)(Convert.ToDouble(newValue)/9);

                    if (newValue > 255) newValue = 255;
                    if (newValue < 0) newValue = 0;

                    image2.SetPixel(m, n, Color.FromArgb(255, newValue, newValue, newValue));

                }
            }

            return image2;
        }