A system for generating and displaying a contrast false color overlay as a focus assist includes a signal divider, an automatic gain control unit, an adder, a signal reducer and a signal combiner. The signal divider receives a signal representing an image and divides the signal into a red channel signal,...http://www.google.com.mx/patents/US5496106?utm_source=gb-gplus-sharePatent US5496106 - System and method for generating a contrast overlay as a focus assist for an imaging device
