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Method and system for determining image transformation

  • US 6,959,098 B1
  • Filed: 11/30/1999
  • Issued: 10/25/2005
  • Est. Priority Date: 11/30/1999
  • Status: Expired due to Term
First Claim
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1. A method of watermark decoding that includes:

  • providing a set of input image data;

    applying an edge detection algorithm to the image data to yield a processed image;

    sensing linear energy in the processed image along more than two different angles;

    identifying an angle yielding an extrema of energy; and

    decoding a watermark from the input image data by reference to said angle.

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