Moments and Moment Invariants in Pattern Recognition - Jan Flusser, Barbara Zitova, Tomas Suk - Google Books

http://books.google.de/books?id=IAFDvarv-AAC&pg=PA165&dq=moment,+vectorspace,+basis&hl=de&sa=X&ei=qZcvUrWDFZCQ7AbTkoDoAQ&ved=0CE

Moments as projections of an image’s intensity onto a proper polynomial basis can be applied to many different aspects of image processing. These include invariant pattern recognition, image normalization, image registration, focus/ defocus measurement,…