A system (20) for recognizing gaming chips (500) includes pairs of light emitting devices P1 through Pn, each pair emitting light (28) of a different color. The light (28) is reflected off of the surface (502) of the gaming chip (500), is sensed by a light detector (32), digitized by an analog to digital...http://www.google.com/patents/US6567159?utm_source=gb-gplus-sharePatent US6567159 - System for recognizing a gaming chip and method of use
