A control system is disclosed for controlling misregistration between the colors of an image printed on a web. The system includes an imaging device such as a camera or group of cameras, a processor, and image conversion circuits coupled to the processor. The system detects print color misregistration...http://www.google.com.tw/patents/US5412577?utm_source=gb-gplus-share專利 US5412577 - Color registration system for a printing press
