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Curve fitting for synchronizing readers of hidden auxiliary data

  • US 7,391,881 B2
  • Filed: 07/11/2006
  • Issued: 06/24/2008
  • Est. Priority Date: 12/18/2000
  • Status: Expired due to Term
First Claim
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1. A method of encoding a reference signal into an image comprising:

  • defining a reference signal comprising signal elements in a circular reference pattern; and

    steganographically embedding the reference signal in perceptible content of the image such that geometric distortion of the image is derived by detecting the signal elements, fitting the detected elements to an ellipse and deriving affine parameters of the geometric distortion from the ellipse.

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