I want to fit ellipse to all the fingertips on this hand using the detected points.
How should I draw ellipse only at those specific places.
Should I store these points in array and draw an ellipse for closest ones? Or is there any optimal solution to this.
After reading the docs and some examples I figured out the way it is supposed to be done.
These are the steps :
C++ std::vector.Rotated Rect variable.cv::fitEllipse method.center and size of the Rotated Rect.cv::RotatedRect _Ellipse['value you want'];
_Ellipse[i] = cv::fitEllipse(points_vector);
cv::Point2f center = cv::Point2f(_Ellipse[i].center.x ,_Ellipse[i].center.y );
cv::Size2f size = cv::Size2f(_Ellipse[i].size.width,_Ellipse[i].size.width);
cv::Size2f size = cv::Size2f(_Ellipse[i].size.width,_Ellipse[i].size.height);
cv::RotatedRect ellipse_rect = cv::RotatedRect(center, size, _Ellipse[i].angle);
cv::ellipse(ref_image, ellipse_rect, cv::Scalar(0,0,255), -1, 8);
I am still not completely sure about this because it is drawing a circle instead of ellipse, but this is like the gist of what is to be done. Thanks.
EDIT
I made a silly mistake while defining Size2f (width instead of height) . Now I am getting proper ellipse.
I tried to draw a circle at the same points after detecting fingertip coordinates, and they nearly overlapped.
Asked: 2016-08-11 12:42:32 -0600
Seen: 1,038 times
Last updated: Aug 23 '16
You Can use cv::fitellipse function to do that. Here's an example how to use it:
Link
Write something like:
cv::RotatedRect rect = cv::fitEllipse(yourPoints)
All Information of the Ellipse are then stored in the RotatedRect e.g.: float centerX = rect.center.x; float a = rect.size.width;
However, as far as i know the fitellipse() function is currently bugged meaning that in some cases it fails returning the correct ellipse.