need general resource about image matching
Check out Szeliski's book:
http://szeliski.org/Book/drafts/SzeliskiBook_20100903_draft.pdf

There is also an old book on feature detection:
http://www.amazon.com/Feature-Extraction-Processing-Computer-Edition/dp/0123965497

You can read the sections that you care about. Also, I think it is always a good idea to read about scale space theory if you are to work with such algorithms. For example:

http://www.nada.kth.se/~tony/book.html