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Product provided with a coding pattern and apparatus and method for reading the pattern

  • US 8,162,220 B2
  • Filed: 08/06/2009
  • Issued: 04/24/2012
  • Est. Priority Date: 10/01/1999
  • Status: Expired due to Fees
First Claim
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1. A product for decoding information, the product comprising:

  • a sensor for detecting a plurality of marks on a surface to obtain associated mark location data, at least a first group of the plurality of marks being arranged on the surface so as to define an invisible raster with predetermined dimensions, and wherein marks in at least a second group of the plurality of marks are displaced from raster locations in a manner encoding information; and

    a processor for receiving from the sensor at least some of the mark location data, the processor being configured to determine, using the received mark location data, a position of the invisible raster on the surface, and the processor being further configured to decode information based on positions of at least some of the marks in the second group of the plurality of marks relative to locations on the invisible raster.

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