Advice on approach to take

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Hi,

First of all.. I am new to image processing and looking through all the projects done using opencv, amazing! Ok back to the question.

I am doing a project and it has image processing involve.

It requires me to detect 5 patterns (star, circle, square, triangle and eclipse) using a webcam. My lecturer said something about training the program first the look for the item..

My question is what approach or method should I take to accomplish the task? And are there sample codes for this?