boxBlur_4 the fastest!!!

gistfile1.cs

        private void boxBlur_4(byte[] originalImage, byte[] blurImage, int w, int h, int r)
        {
            for (int i = 0; i < originalImage.Length; i++)
            {
                blurImage[i] = originalImage[i];
            }
            boxBlurH_4(blurImage, originalImage, w, h, r);
            boxBlurT_4(originalImage, blurImage, w, h, r);
        }
        private void boxBlurH_4(byte[] originalImage, byte[] blurImage, int w, int h, int r)
        {
            double iarr = 1 / (r + r + 1);
            for (int i = 0; i < h; i++)
            {
                int ti = i * w, li = ti, ri = ti + r;
                byte fv = originalImage[ti], lv = originalImage[ti + w - 1];
                double val = (r + 1) * fv;

                for(int j = 0; j<r;j++) val+=originalImage[ti+j];
                for (int j = 0; j <= r; j++) 
                {
                    val += originalImage[ri++] - fv;
                    blurImage[ti++] = (byte)Math.Round(val * iarr);
                }

                for (int j = r+1; j < w - r; j++)
                {
                    val += originalImage[ri++] - originalImage[li++];
                    blurImage[ti++] = (byte)Math.Round(val * iarr);
                }

                for (int j = w-r; j < w; j++)
                {
                    val += lv - originalImage[li++];
                    blurImage[ti++] = (byte)Math.Round(val * iarr);
                }
            }
        }

        private void boxBlurT_4(byte[] originalImage, byte[] blurImage, int w, int h, int r)
        {
            double iarr = 1 / (r + r + 1);
            for (int i = 0; i < w; i++)
            {
                int ti = i, li = ti, ri = ti + r*w;
                byte fv = originalImage[ti], lv = originalImage[ti + w * (h - 1)];
                double val = (r + 1) * fv;

                for (int j = 0; j < r; j++) val += originalImage[ti + j*w];
                for (int j = 0; j <= r; j++)
                {
                    val += originalImage[ri++] - fv;
                    blurImage[ti++] = (byte)Math.Round(val * iarr);
                }

                for (int j = r + 1; j < w - r; j++)
                {
                    val += originalImage[ri++] - originalImage[li++];
                    blurImage[ti++] = (byte)Math.Round(val * iarr);
                }

                for (int j = w - r; j < w; j++)
                {
                    val += lv - originalImage[li++];
                    blurImage[ti++] = (byte)Math.Round(val * iarr);
                }
            }
        }