Snapshot Filtering C#

        Bitmap bmpAsli, bmpHasil;
        private void assignMatrix(int i, int j, ref byte[] red, ref byte[] green, ref byte[] blue)
        {
            int hi = i - 1;
            int hj = j - 1;

            for (int index = 0; index < 9; index++)
            {
                red[index] = bmpAsli.GetPixel(hi, hj).R;
                green[index] = bmpAsli.GetPixel(hi, hj).G;
                blue[index] = bmpAsli.GetPixel(hi, hj).R;

                if (hj - (j - 1) == 2)
                {
                    hi += 1;
                    hj = j - 1;
                }
                else
                {
                    hj += 1;
                }
            }
        }

        private void sortMatrix(int size, ref byte[] red, ref byte[] green, ref byte[] blue)
        {
            for (int m = 0; m < size - 1; m++)
            {
                for (int n = 0; n < size - 1 - m; n++)
                {
                    if (red[n] > red[n + 1])
                    {
                        byte temp = red[n];
                        red[n] = red[n + 1];
                        red[n + 1] = temp;
                    }

                    if (green[n] > green[n + 1])
                    {
                        byte temp = green[n];
                        green[n] = green[n + 1];
                        green[n + 1] = temp;
                    }

                    if (blue[n] > blue[n + 1])
                    {
                        byte temp = blue[n];
                        blue[n] = blue[n + 1];
                        blue[n + 1] = temp;
                    }
                }
            }
        }

        private void buttonMedianFilter_Click(object sender, EventArgs e)
        {
            Cursor = Cursors.WaitCursor;

            byte[] red = new byte[9];
            byte[] green = new byte[9];
            byte[] blue = new byte[9];

            bmpAsli = (Bitmap)pictureBoxInput.Image;
            int nWidth = bmpAsli.Width - 1;
            int nHeight = bmpAsli.Height - 1;
            bmpHasil = new Bitmap(bmpAsli.Width, bmpAsli.Height);

            for (int i = 1; i < nWidth; i++)
            {
                for (int j = 1; j < nHeight; j++)
                {
                    assignMatrix(i, j, ref red, ref green, ref blue);
                    sortMatrix(9, ref red, ref green, ref blue);
                    bmpHasil.SetPixel(i, j, Color.FromArgb(red[4], green[4], blue[4]));
                }
            }

            pictureBoxOutput.Image = bmpHasil;

            Cursor = Cursors.Default;
        }

        private void buttonMaxFilter_Click(object sender, EventArgs e)
        {
            Cursor = Cursors.WaitCursor;

            byte[] red = new byte[9];
            byte[] green = new byte[9];
            byte[] blue = new byte[9];

            bmpAsli = (Bitmap)pictureBoxInput.Image;
            int nWidth = bmpAsli.Width - 1;
            int nHeight = bmpAsli.Height - 1;
            bmpHasil = new Bitmap(bmpAsli.Width, bmpAsli.Height);

            for (int i = 1; i < nWidth; i++)
            {
                for (int j = 1; j < nHeight; j++)
                {
                    assignMatrix(i, j, ref red, ref green, ref blue);
                    sortMatrix(9, ref red, ref green, ref blue);
                    bmpHasil.SetPixel(i, j, Color.FromArgb(red[8], green[8], blue[8]));
                }
            }

            pictureBoxOutput.Image = bmpHasil;

            Cursor = Cursors.Default;
        }

        private void buttonMinFilter_Click(object sender, EventArgs e)
        {
            Cursor = Cursors.WaitCursor;

            byte[] red = new byte[9];
            byte[] green = new byte[9];
            byte[] blue = new byte[9];

            bmpAsli = (Bitmap)pictureBoxInput.Image;
            int nWidth = bmpAsli.Width - 1;
            int nHeight = bmpAsli.Height - 1;
            bmpHasil = new Bitmap(bmpAsli.Width, bmpAsli.Height);

            for (int i = 1; i < nWidth; i++)
            {
                for (int j = 1; j < nHeight; j++)
                {
                    assignMatrix(i, j, ref red, ref green, ref blue);
                    sortMatrix(9, ref red, ref green, ref blue);
                    bmpHasil.SetPixel(i, j, Color.FromArgb(red[0], green[0], blue[0]));
                }
            }

            pictureBoxOutput.Image = bmpHasil;

            Cursor = Cursors.Default;
        }