opencv canny 算子

#include<opencv2/opencv.hpp>
#include<opencv2/core/core.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<iostream>
using namespace cv;
using namespace std;
int main()
{
Mat src = imread("1.jpg");
Mat src1 = src.clone();
imshow("yuantu",src);

Mat dst,edge,gray;
dst.create(src1.size(),src1.type());
//转化灰度图
cvtColor(src1,gray,COLOR_BGR2GRAY);
//降噪
blur(gray,edge,Size(3,3));
//运算canny 算子
Canny(edge,edge,3,9,3);
dst = Scalar::all(0);
//使用canny算出边缘图作为掩码，来将原来图
//src1 拷贝到目标图dst中
src1.copyTo(dst,edge);
imshow("xiaoguotu",dst);
waitKey(0);
return 0;

}

运行效果如下