Video processing tracking two points

I am trying to detect two points on a gray surface and then track their position throughout the video. I tried the KLT and it was not working giving me an error and the points are not being detected because it is a gray picture and the two points are dark. What method should I try?

Answer 1

[Image Analyst]

Well you're not segmenting out the dark dots properly. Perhaps your threshold is wrong. For what it's worth, I attach a demo where I track a green marker in a video.

[M]

Thank you very much. This seems helpful.