13. 用Roberts、Sobel、Prewitt和Laplace算子对一幅灰度图像进行边缘检测。观察异同。

#include <opencv2/opencv.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
using namespace cv;
int main()
{
    Mat grad_x, grad_y;
    Mat abs_grad_x, abs_grad_y, dst, src_gray, abs_dst;
    Mat src = imread("6013202130.jpg");  //工程目录下应该有一张名为1.jpg的素材图
    imshow("【原始图】sobel边缘检测", src);
    Sobel(src, grad_x, CV_16S, 1, 0, 3, 1, 1, BORDER_DEFAULT);
    convertScaleAbs(grad_x, abs_grad_x);
    Sobel(src, grad_y, CV_16S, 0, 1, 3, 1, 1, BORDER_DEFAULT);
    convertScaleAbs(grad_y, abs_grad_y);
    addWeighted(abs_grad_x, 0.5, abs_grad_y, 0.5, 0, dst);
    imshow("【效果图】整体方向Sobel", dst);
    GaussianBlur(src, src, Size(3, 3), 0, 0, BORDER_DEFAULT);
    cvtColor(src, src_gray, CV_RGB2GRAY);
    Laplacian(src_gray, dst, CV_16S, 3, 1, 0, BORDER_DEFAULT);
    convertScaleAbs(dst, abs_dst);
    imshow("【效果图】图像Laplace变换", abs_dst);
    waitKey(0);
    return 0;
}