Patent ID: 6135354
Filing Date: 2000-10-24
Classification: G06K

Abstract:
A system for processing video signals representing barcode labels, the system comprising:a video camera positioned to view a moving web carrying a plurality of barcode labels disposed thereon and which outputs a video signal;a strobe device positioned to illuminate a field of view of the video camera;a sync separator circuit receiving as input the video signal output from the video camera and extracting therefrom a vertical synchronization signal which comprises a sequence of pulses occurring at a predetermined frequency, each pulse representing a start of a video field of the video signal;a detector to detect a barcode label approaching the field of view of the video camera and generating as output a registration signal indicative thereof;a control circuit coupled to the sync separator circuit, to the detector and to the strobe device, the control circuit receiving as input the vertical synchronization signal and the registration signal output from the detector and generating a strobe trigger signal timed with respect to pulses in the vertical synchronization signal so as to cause the strobe device to flash at a time coincident with a next available video field integration period of the video camera.