Find known sub image in larger image

Question

Does anyone know of an algorithm (or search terms / descriptions) to locate a known image within a larger image?

e.g.

I have an image of a s

Answer 1

You said your image may not be exactly the same, but then say you don't want "fuzzy" algorithms. I'm not sure those are compatible. In general, though, I think you want to look at image registration algorithms. There's an open source C++ package called ITK that might provide some hints. Also ImageJ is a popular open source Java package. Both of these have at least some registration capabilities available if you poke around.