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System for locating and determining the orientation of bar codes in a two-dimensional image

  • US 5,296,690 A
  • Filed: 09/26/1991
  • Issued: 03/22/1994
  • Est. Priority Date: 03/28/1991
  • Status: Expired due to Term
First Claim
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1. A method for reading a bar code symbol, said method comprising:

  • capturing and storing a two dimensional image in a memory, said stored two dimensional image containing an image of a bar code symbol anywhere within the field of view of said stored two dimensional image;

    locating an area within the field of view of said stored two dimensional image, said located area being likely to contain a bar code image, said locating step including the step of comparing two substantially parallel scan line segments by comparing corresponding points of a function of the reflectance waveforms of said two substantially parallel scan line segments, said function having a plurality of output points for each of said scan line segments;

    examining the image within said located area to determine the orientation of said bar code image within said located area of said stored two dimensional image;

    filtering said bar code image along an axis substantially perpendicular to said detected orientation of said bar code image; and

    scanning said filtered bar code image to read out information contained in said bar code image.

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