Image Processing for Augmented Reality

Question

Hello, I need some help on Augmented Reality. I have develop a small application.NOw I want to use shape detection algorithm or specially circle detection algorithm.I want that after my camera get open It should only detect circles and if it gets circles it should get replaced with some corresponding image. I hope you understood what I want to do.

Answer 1

Try the ARToolKit

Answer 2

See http://stackoverflow.com/questions/953714/face-recognition-library

I like OpenCV, it can detect circles easily.