OpenCV How to Plot velocity vectors as arrows in using single static image

Question

I am trying to plot velocity vectors like in matlab we use \"quiver\" function http://www.mathworks.com/help/techdoc/ref/quiver.html

I need to port same methodology

Answer 1

The cvCalOpticalFlowLK does not plot velocity vectors, it computes these velocity vectors. If you do not have these vectors, you must call this function with two images. I guess you already have these vectors, and you just want to plot them.

In this case, you can use the cv::line function, for example:

cv::line(yourImage, cv::Point(baseX, baseY), cv::Point(endX, endY));

I hope this will help you!