#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;


class EdgeDetector {
    public:
    static vector<cv::Point> detect_edges( Mat& image);
    static Mat debug_squares( Mat image );
    
    private:
    static double get_cosine_angle_between_vectors( cv::Point pt1, cv::Point pt2, cv::Point pt0 );
    static vector<vector<cv::Point> > find_squares(Mat& image);
    static float get_width(vector<cv::Point>& square);
    static float get_height(vector<cv::Point>& square);
};