drawContours vector<Point>
Hello forum,
I have a vector of class Object , each containing a single contour.
vector<Object> People;
Class Object {
private:
vector<Point> contour;
public:
vector<Point> get_Contour { return contour; }
};
I am having problems trying to draw the contour using the drawContours function
for (int i = 0; i < People.size(); i++)
drawContours(display, People[i].get_Contour(), -1, Scalar(255, 255, 255), 1, 8, noArray(), 2147483647 , Point());
OpenCV Error: Assertion failed (i < 0) in cv::_InputArray::getMat_, file C:\builds\master_PackSlave-win64-vc12-shared\opencv\modules\core\src\matrix.cpp, line 1151
How its done in the tutorial is that a vector< vector< Point>> is passed. However I only have one contour, a vector< Point>. I hope I can get some help on this.
may be you can use polylines instead of drawContours
Hello, thanks for the reply. However, I need to be able to offset ( Point(x,y) ) the contours as it's coordinates / midpoint is calculated by another function, Do you think I should just use vector<vector<point>> contour but with only 1 contour stored ?
Yes it works too like this
did you try in the original code instead of using
-1for theidxparameter to use theifrom thePeople'ssize. Moreover, why yourmaxLevelparameter is set to so high value (i.e. 2147483647)?your design looks broken. what's the need for an
Objectclass ?Like @berak said, I am more convinced that you are making a huge design mistake by wrapping it inside the object class. There is about ZERO need for that right?