text: // Fast method to check if a contour is a rectangle or not
  /*****************************
      Copyright 2011 Rafael Muñoz Salinas. All rights reserved.
  
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      ********************************/
  #ifndef _Aruco_CheckRectContour_H
  #define _Aruco_CheckRectContour_H
  
  #include "aruco_export.h"
  
  #include <opencv2/core/core.hpp>
  
  #include <string>
  
  namespace aruco
  {
      /**\brief Checks if a contour is a rectangle
       */
      class ARUCO_EXPORT CheckRectContour
      {
      public:
          // returns the approximation or empty if not a convex rectangle
          static std::vector<cv::Point> getConvexRect(std::vector<cv::Point>& points, float thres = 2);
  
      private:
          static void calculate_emax_between_points(const std::vector<cv::Point>& contorno, unsigned int inicial,
                                                    unsigned int final, float& errorMaximo, unsigned int& posicion);
  
          static bool check_rect_contour(const std::vector<cv::Point>& contorno, const float& umbral,
                                         std::vector<cv::Point>& aproximacion);
      };
  }
  #endif
  