//zona 1
			if ((fi.at<float>(i, j)>=(-PI / 8) && fi.at<float>(i, j)<=(PI / 8)) ||
				(fi.at<float>(i, j) >= ((7 * PI) / 8) || fi.at<float>(i, j) <=((-7 * PI) / 8))){

				if (G.at<float>(i, j) < G.at<float>(i, j + 1) || G.at<float>(i, j) < G.at<float>(i, j - 1))
					aux.at<float>(i, j) = 0;
				else
					aux.at<float>(i, j) = G.at<float>(i, j);
			}
			//zona 1
			if ((fi.at<float>(i, j)>=((-7*PI) / 8) && fi.at<float>(i, j)<=((-5*PI) / 8)) ||
				(fi.at<float>(i, j) >= ( PI / 8) && fi.at<float>(i, j) <= ((3 * PI) / 8))){

				if (G.at<float>(i, j) < G.at<float>(i-1, j + 1) || G.at<float>(i, j) < G.at<float>(i+1, j - 1))
					aux.at<float>(i, j) = 0;
				else
					aux.at<float>(i, j) = G.at<float>(i, j);
			}
            //zona2
			if ((fi.at<float>(i, j)>=((-5 * PI) / 8) && fi.at<float>(i, j)<=((-3 * PI) / 8)) ||
				(fi.at<float>(i, j) >= ((3*PI) / 8) && fi.at<float>(i, j) <= ((5 * PI) / 8))){

				if (G.at<float>(i, j) < G.at<float>(i - 1, j ) || G.at<float>(i, j) < G.at<float>(i + 1, j ))
					aux.at<float>(i, j) = 0;
				else
					aux.at<float>(i, j) = G.at<float>(i, j);
			}
			//zona 3
			if ((fi.at<float>(i, j)>=((-3 * PI) / 8) && fi.at<float>(i, j)<=((- PI) / 8)) ||
				(fi.at<float>(i, j) >= ((5 * PI) / 8) && fi.at<float>(i, j) <= ((7 * PI) / 8))){

				if (G.at<float>(i, j) < G.at<float>(i - 1, j-1) || G.at<float>(i, j) < G.at<float>(i + 1, j+1))
					aux.at<float>(i, j) = 0;
				else
					aux.at<float>(i, j) = G.at<float>(i, j);
			}