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Watermark detection using adaptive color projections

  • US 7,072,487 B2
  • Filed: 01/26/2001
  • Issued: 07/04/2006
  • Est. Priority Date: 01/26/2001
  • Status: Expired due to Term
First Claim
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1. A method of filtering data prior to reading a digital watermark that was inserted using a scale to black technique, said method comprising:

  • projecting color values of each pixel onto a preferred projection axis that is adaptively determined by examining color of at least some of the pixels surrounding each pixel, wherein the preferred projection is adaptively determined from said examining and not through selection of a predetermined projection axis without such an examination, whereby watermark reading is aligned to watermark insertion, andreading the watermark from resulting data.

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