图像边缘计算 canny算子

原理:

https://www.cnblogs.com/nowgood/p/cannyedge.html

#include <opencv2/opencv.hpp>
#include <iostream>
#include <math.h>
using namespace cv;
using namespace std;

Mat src, dst,dst2,gray_src;
char* INPUT_WIN = "input image";
char* OUTPUT_WIN = "binary image";
int t1_value = 50;
int max_value = 255;

void Canny_Demo(int, void*)
{
    Mat edge_output;
    //中值滤波
    blur(gray_src, edge_output, Size(3, 3), Point(-1, -1), BORDER_DEFAULT);
    Canny(edge_output, edge_output, t1_value, t1_value * 2, 3, false);

    imshow(OUTPUT_WIN, edge_output);
}



int main()
{

    src = imread(".//pic//kate.png");

    namedWindow(INPUT_WIN, CV_WINDOW_AUTOSIZE);
    namedWindow(OUTPUT_WIN, CV_WINDOW_AUTOSIZE);
    imshow(INPUT_WIN, src);
    
    cvtColor(src, gray_src, CV_BGR2GRAY);
    createTrackbar("Threshold Value", OUTPUT_WIN, &t1_value, max_value, Canny_Demo);
    Canny_Demo(0, 0);
    

    waitKey(0);
    return 0; 
}