void Medin(ref Color col,int x,int y,int h,int w)
        {
            Color c; int p = 0; int X, Y;
            int[] rg, bg, gg;
            rg = new int[9]; bg = new int[9]; gg = new int[9];
            for (int i = -1; i <= 1; ++i)
            {

                for (int j = -1; j <= 1; ++j)
                {
                    X = x + j; Y = y + i;
                    if (x + j >= w) X = x-j;
                    if (x + j < 0) X = x-j;
                    if (y + i >= h) Y = y-i;
                    if (y + i < 0) Y = y-i;

                    c = bmp.GetPixel(X, Y);
                    rg[p] = c.R;
                    bg[p] = c.B;
                    gg[p]=c.G;
                    ++p;
                 }
                 }
            Array.Sort(rg); Array.Sort(bg); Array.Sort(gg);
            col = Color.FromArgb(rg[4], gg[4], bg[4]);
        }