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Digital watermark detection using predetermined color projections

  • US 7,995,790 B2
  • Filed: 06/28/2006
  • Issued: 08/09/2011
  • Est. Priority Date: 01/26/2001
  • Status: Expired due to Fees
First Claim
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1. A system to read a digital watermark from digital imagery that includes data representing a number of pixels, wherein each pixel of the number of pixels is defined by a set of values representing color components of the particular pixel, and wherein the digital watermark is embedded in the digital imagery through modifications to at least some data representing the digital imagery, the system comprising:

  • a filter for calculating values of pixels along a preferred projection axis, wherein the preferred projection axis corresponds to a direction of embedding determined based on color characteristics of at least some pixels associated with the digital imagery; and

    an electronic processing unit programmed as a digital watermark reader for operating on values calculated by the filter.

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