#include <stdio.h>
#include <iostream> 
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <opencv2/opencv.hpp>
#include "opencv2/imgcodecs.hpp"

using namespace cv;
using namespace std;
/** @function main */
int main(int argc, char** argv)
{
	Mat src = imread("d:/image/checkerboard.png", IMREAD_GRAYSCALE);
	Mat dst, cdst;
	Canny(src, dst, 50, 200, 3);
	cvtColor(dst, cdst, CV_GRAY2BGR);

	vector<Vec4i> lines;
	HoughLinesP(dst, lines, 1, CV_PI / 180, 50, 50, 10);
	for (size_t i = 0; i < lines.size(); i++)
	{
		Vec4i l = lines[i];
		line(cdst, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0, 0, 255), 3, CV_AA);
	}

	imshow("source", src);
	imshow("detected lines", cdst);
	waitKey(0);

}
/** @function readme */