Image matching

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We are about to start a big project where image matching is a central function. We want to know wheter Open-CV is a sufficient Tool for that. We got a very big master image and a number of discrete images taken from above the master image. Now we want to find the exact position, orientation and scale of the smaller image in relation to our master image. Do anyone have experiance with similar functionality? Can you give us an idea on the efficiency of the involved algorithms?

Thanks.