Detecting Markers Using OpenCV

Question

I am trying to detect various objects containing colored markers, so a red blue green marker identifies object A, and a red blue red marker identifies object B. My problem is I can't use template matching cause objects can be rotated, currently I am thinking about check for each color then find the object by checking the distance between colors but it seems inefficient, so my question is there a better way to do this?

Answer 1

Here's a short article I wrote about tracking colored objects. This just might be what you're looking for.