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Image matching with a slight twist

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I'm working on a little project to do with image processing and recognition, and to start with I'm trying to find a specified smaller image within another larger image. I've got this working with no issue; can detect the smaller image every time.


As an added extra I want to be able to find my smaller image inside the big one even if it’s been rotated by an unspecified amount inside the big one.


But I’m not really sure how I would go about this. Any help would be appreciated, either topics I can read on the subject or even specific example.


Just for added detail I'm using c#.


Thanks in advance.

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