Method and apparatus for stroboscopic video inspection of an...

Details Method and apparatus for stroboscopic video inspection of an... Method and apparatus for stroboscopic video inspection of an...

H - Electricity

04

N

350/32

H04N 7/18 (2006.01)

Patent

CA 1308805

ABSTRACT METHOD AND APPARATUS FOR STROBOSCOPIC VIDEO INSPECTION OF AN ASYNCHRONOUS EVENT Apparatus and method particularly suitable for use with the closed loop color to color registration system of a commercial web printing apparatus utilizes a CCD camera having an image sensor and a synchronization generator circuit which generates periodic scan pulses which trigger the image acquisition scan of the image sensor. A predetermined time prior to triggering of a strobe a prefresh pulse is generated in order to trigger a complete scan of the image sensor prior to firing the strobe. A predetermined time period subsequent to the firing of the strobe a scan triggering pulse is generated to trigger an image acquisition scan of the image sensor. This results in highly stable and reliable acquisition of a low noise image of for example, a registration mark on a printed web which may then be processed by a registration control system.

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