note

matx = (-1,0,1;-2,0,2;-1,0,1)

maty = (-1,-2,-1;0,0,0;1,2,1)

code

// 图像增强之图像锐化(边缘增强)之sobel算子
void GetSobelMat(Mat& sobelX, Mat& sobelY) {
	sobelX = (Mat_<int>(3,3) << -1,0,1,-2,0,2,-1,0,1);
	sobelY = (Mat_<int>(3,3) << -1,-2,-1,0,0,0,1,2,1);
}
void EdgeSharpenSobel(Mat&src, Mat& res) {
	Mat resX;
	Mat resY;
	Mat sobelX;
	Mat sobelY;

	GetSobelMat(sobelX, sobelY);

	filter2D(src, resX, src.type(), sobelX);	// 使用sobel卷积得到x分量
	filter2D(src, resY, src.type(), sobelY);	// 使用sobel卷积得到y分量

	add(resX,resY,res);
}
void EdgeSharpenSobelTest(void) {
	Mat src = imread("../source/lena.jpg", IMREAD_GRAYSCALE);
	if (src.empty()) {
		printf("src empty\n");
		return;
	}
	Mat res(src.rows, src.cols, src.type(), Scalar(0));

	namedWindow("src", WINDOW_NORMAL);
	namedWindow("res", WINDOW_NORMAL);

	EdgeSharpenSobel(src, res);

	imshow("src", src);
	imshow("res", res);

	MyWait();
	destroyAllWindows();
}

test