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how to detect object and pattern and retrieve the angle of orientation

I am new to OpenCV I want to know how i can detect an object regardless of its orientation for example. the following is a reference picture

Reference Picture:

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2.How to detect the object in difference orientations, how to know the angle of its orientation?

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  1. How to detect the same object eventhough it has a spot, and point out where the spot is

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My development platform is VS2010 with opencv 2.4.10, much appreciate if you can help me. Color is not essential here.