Image comparison library

I'm searching for the library about Image comparison.

So to speak, I have one big image and one small piece of image.
The small image is the piece of the big image.

Comparing the small image with big image, I want to know where the position is, what the xy location is.

How can I solve this?

Please recommend me the good library, or tool.
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Sharon SethCommented:
Why can't you use a image picker , it would give you the exact coordinates.

While you can get a comparison library , it may not exactly do the plotting for you . You might have to add over it

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