A method and an apparatus determines at least one of rank or suit of a playing card. The apparatus has at least one two-dimensional complementary metal oxide semiconductor imaging system that provides a signal when playing cards are moved over the system. The signal is a series of gray scale values that...http://www.google.com/patents/US20070018389?utm_source=gb-gplus-sharePatent US20070018389 - Card reading system employing CMOS reader
