System and method for reliable content access using a cellular/wireless device with imaging capabilities

  • US 7,575,171 B2
  • Filed: 08/30/2006
  • Issued: 08/18/2009
  • Est. Priority Date: 09/01/2005
  • Status: Expired due to Fees
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First Claim
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1. A method to use part of a printed or displayed medium for identifying a reference and using the reference to access at least one of information, services, and content related to the reference, the method comprising:

  • capturing an image of the reference with an imaging device;

    sending the image via a communications network to a processing center;

    pre-processing by the processing center to identify at least one relevant frame within the image and to perform general purpose enhancement operations;

    detecting most relevant frame within the image and frame properties comprising at least one of pixels, axis ratio, and illumination characteristics;

    applying geometric, illumination, and focus correction on the most relevant frame;

    using color, aspect ration, and frame color, to perform a coarse recognition and thereby limit a number of possible identifications of the reference within the most relevant frame; and

    using rescaling, histogram equalization, block labeling, edge operation, and normalized cross correlation, to identify the reference within the image.

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