Duplicate image detection algorithms?

Question

I am thinking about creating a database system for images where they are stored with compact signatures and then matched against a \"query image\" that could be a resized, c

Answer 1

The article you might be referring to on Wikipedia on feature detection.

If you are running on Intel/AMD processor, you could use the Intel Integrated Performance Primitives to get access to a library of image processing functions. Or beyond that, there is the OpenCV project, again another library of image processing functions for you. The advantage of a using library is that you can try various algorithms, already implemented, to see what will work for your situation.