library that identifies similar images

Question

I want to determine how similar 2 images are. The images may have been scaled, cropped, etc, so a simple pixel comparison won't work.

I have had a look around and there are a lot of academic papers on this topic but they don't release their code. So, do you know of a released library that can compare images (for Linux and Windows)?

Answer 1

I came across this fantastic list of software for computer vision: http://www.cs.cmu.edu/~cil/v-source.html

And decided to look at these 2 tools in more detail:

• http://libpuzzle.pureftpd.org/project/libpuzzle
• http://appsrv.cse.cuhk.edu.hk/~jkzhu/felib.html