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BARCODE READER WITH EDGE DETECTION ENHANCEMENT

  • US 20120118974A1
  • Filed: 11/17/2010
  • Published: 05/17/2012
  • Est. Priority Date: 11/17/2010
  • Status: Active Grant
First Claim
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1. An optical reader for decoding an encoded symbol character of a symbology, the optical reader comprising:

  • a laser source for generating a laser beam along an optical path;

    a lens assembly for focusing the laser beam on the encoded symbol character at a plane of focus;

    a scanning mechanism for oscillating the laser beam at a pre-determined frequency to sweep over the encoded symbol character according to a pre-described scan pattern;

    a photodetector having as an input detected light intensity corresponding to the laser beam scattered off the scanned encoded symbol character, and having as an output a scan data signal encoding information representative of the encoded symbol character; and

    a scan data signal processor having an input and an output, the scan data signal processor comprising a first time delay stage adapted to provide a primary phase waveform from the scan data signal, a second time delay stage adapted to provide an early phase waveform from the scan data signal, the early phase waveform having a propagation delay less than the primary phase waveform, and a third time delay stage adapted to provide a delayed phase waveform from the scan data signal, the delayed phase waveform having a propagation delay greater than the primary phase waveform, the scan data signal processor further comprising a peak window detection stage for generating a peak window timeframe when an amplitude of the primary phase waveform is greater than or equal to, less than, or equal to both an amplitude of the early phase waveform and the delayed phase waveform; and

    a digitizer circuit adapted to accept, within the peak window timeframe, the scan data signal processor output.

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