Patent ID: 6497366
Filing Date: 2002-12-24
Classification: G06K

Abstract:
A dual channel video data recovery system for use in a bar code scanner, comprising:a video signal generator for producing first and second video signals in response to light reflected from a bar code; a first video processing circuit for processing the first video signal, the first video processing circuit comprising: a first bandpass filter for filtering the first video signal, the first bandpass filter having a first center frequency and a first frequency range, the first bandpass filter producing a filtered video signal; and a first threshold generator for generating a first threshold; a second video processing circuit for processing the second video signal, the second video processing circuit comprising: a second bandpass filter for filtering the second video signal the second bandpass filter having a second center frequency different from the first center frequency and a second frequency range, the second bandpass filter producing a second filtered video signal; and a second threshold generator for generating a second threshold which is different from the first threshold; a circuit for converting the first and second thresholded video signals to a first and a second digital data string; and a data decoding circuit for decoding the first and second digital data strings to recover bar code data.