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Halftone watermarking and related applications

  • US 7,020,349 B2
  • Filed: 02/17/2004
  • Issued: 03/28/2006
  • Est. Priority Date: 10/11/2000
  • Status: Expired due to Term
First Claim
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1. An image processor for determining geometric distortion of an image;

  • the process comprising;

    a halftone screen threshold analyzer for creating a target orientation signal by applying a halftone screen threshold mask to image data from a received image; and

    a correlation operator for correlating the target orientation signal with the received image in a correlation domain, the correlation operator producing one or more orientation parameters estimating geometric distortion of the image.

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