Code reader

Details Code reader Code reader

G - Physics

06

K

352/53.74

G06K 9/00 (2006.01) G06K 7/016 (2006.01) G06K 7/10 (2006.01) G06K 7/14 (2006.01)

Patent

CA 1246219

CODE READER ABSTRACT OF THE DISCLOSURE A code reader and method which is capable of reading "black-on-black" codes such as bar codes which are molded in the surface of an object. The code is illuminated so as to provide light-to-shadow transitions which are read by an imaging device such as a video camera. The resultant video signal transitions representing light-to-dark transitions are differentiated and converted to a train of pulses which are submitted to a delay line sequencing network to develop a series of timing signals. These timing signals are utilized to operatea sampling network to derive 0-bit and 1-bit code information which is submitted serially to a serial-to-parallel shift register to permit code reading by a microcomputer function. Legality checks are carried out with respect to sampling and the developed word and quiescent zones are developed with respect to the start and stop of a given code sequence.

503318

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