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Computing Distortion of Media Signals Using Embedded Data with Repetitive Structure and Log-Polar Mapping

  • US 20070092108A1
  • Filed: 12/19/2006
  • Published: 04/26/2007
  • Est. Priority Date: 08/15/2002
  • Status: Active Grant
First Claim
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1. A computing apparatus to determine distortion of a signal with embedded data, said apparatus comprising:

  • electronic processing circuitry; and

    memory, said memory comprising instructions for processing by said electronic processing circuitry, the instructions comprising instructions to;

    transform the signal into a transform domain to produce peaks due to a repetitive structure of the embedded data in the signal;

    perform a mapping of the transformed signal to convert distortion of the embedded data into a shift; and

    perform a correlation of the mapped signal with a signal representing an expected pattern of peaks associated with the repetitive structure of the embedded data signal, wherein the correlation detects the shift, and the shift provides a measure of the distortion of the signal.

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