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One idea: First etect circular objects via Hough-Trransform, then check each circle if it looks like your object you are searching for.

Two other posts which might give you some ideas:

http://answers.opencv.org/question/265/whats-the-best-way-to-segment-different-coloured/

http://answers.opencv.org/question/8818/point-tracking/

One idea: First etect circular objects via Hough-Trransform, then check each circle if it looks like your object you are searching for.

Two other posts which might give you some ideas:

http://answers.opencv.org/question/265/whats-the-best-way-to-segment-different-coloured/

http://answers.opencv.org/question/8818/point-tracking/


Update

Afaik you can just define dst as a one-column matrix and draw in that, then use it for the input to HoughCircles.