Gradient

gistfile1.txt

ret_corners[num_corners].dIx = (p[pixel[4]] - p[pixel[12]]) +
(p[pixel[3]] + p[pixel[5]] - p[pixel[11]] - p[pixel[13]])*0.924f +
(p[pixel[2]] + p[pixel[6]] - p[pixel[10]] - p[pixel[14]])*0.707f +
((p[pixel[1]] + p[pixel[7]] - p[pixel[9]] - p[pixel[15]])*0.383f);
ret_corners[num_corners].dIy = (p[pixel[0]] - p[pixel[8]]) +
(p[pixel[1]] + p[pixel[15]] - p[pixel[7]] - p[pixel[9]])*0.924f +
(p[pixel[2]] + p[pixel[14]] - p[pixel[6]] - p[pixel[10]])*0.707f +
((p[pixel[3]] + p[pixel[13]] - p[pixel[5]] - p[pixel[11]])*0.383f);