what java library exists that allows me to search for a given region of a picture? For example, I want to search for a specific picture within a larger picture.
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You could consider taking a look at imagej for a library to process the image. This stackoverflow question also has some good links as to other libraries you could use.
For tackling the actual problem of searching an image part in a larger image, I urge you to look at several resources: a thesis on region based image similarity search, cluster analysis, and another article on efficient region-based image retrieval.
I was unable to find a Java library that already fills this void, so you may have to roll your own.