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Autodiscrimination for dataform decoding and standardized recording

  • US 5,739,518 A
  • Filed: 05/17/1995
  • Issued: 04/14/1998
  • Est. Priority Date: 05/17/1995
  • Status: Expired due to Term
First Claim
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1. A method employing 2D dataform identification before decoding of a dataform present in a target area, comprising the steps of:

  • (a) making available feature reference data defining at least a first image feature of at least a first type of 2D dataform;

    (b) making available pattern reference data defining at least a first sampling pattern for selecting a limited amount of image data for a predetermined pattern of pixel positions representing less than a complete dataform image;

    (c) providing image data, for a two-dimensional array of pixel positions, representative of illumination reflected from said target area;

    (d) using step (b) pattern reference data for said first sampling pattern to select image data from pixel positions corresponding to said first sampling pattern from image data provided in step (c);

    (e) utilizing step (a) feature reference data for said first image feature to develop an identification indicia representative of a level of compatibility between said sampling pattern image data selected in step (d) and said image feature; and

    (f) activating, in response to said identification indicia, a decoding protocol suitable for processing step (c) image data to decode said first type of 2D dataform, in order to attempt to decode said dataform present in said target area.

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