Delaunay triangulation opencv c++

Question

I made a delaunay triangulation with openCv thanks to this code : example code (in partiluclar draw_subdiv). However, when I want to display the triangulation, I get the mesh a

Answer 1

Well I think it is easy. Just detect when the points are out of the image and dont draw them.

In your display function write:

 void draw_subdiv(Mat &img, Subdiv2D& subdiv, Scalar delaunay_color)
{
  bool draw;
  vector<Vec6f> triangleList;
  subdiv.getTriangleList(triangleList);
  vector<Point> pt(3);

  for(size_t i = 0; i < triangleList.size(); ++i)
    {
      Vec6f t = triangleList[i];

      pt[0] = Point(cvRound(t[0]), cvRound(t[1]));
      pt[1] = Point(cvRound(t[2]), cvRound(t[3]));
      pt[2] = Point(cvRound(t[4]), cvRound(t[5]));
      // MY PIECE OF CODE
      draw=true;

      for(int i=0;i<3;i++){
         if(pt[i].x>img.width||pt[i].y>img.heigth||pt[i].x<0||pt[i].y<0)
            draw=false;
      }
      if (draw){
         line(img, pt[0], pt[1], delaunay_color, 1);
         line(img, pt[1], pt[2], delaunay_color, 1);
         line(img, pt[2], pt[0], delaunay_color, 1);
      }


    }
}