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System and method for detecting the watermark using decision fusion

  • US 8,666,111 B2
  • Filed: 07/28/2011
  • Issued: 03/04/2014
  • Est. Priority Date: 05/24/2011
  • Status: Active Grant
First Claim
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1. A method for detection of a plurality of attacks or distortions on an electronic media signal, the method comprising the computer implemented steps of:

  • extracting the electronic media signal from a compressed electronic media signal by employing at least one decompressing means, wherein the electronic media signal comprises one or more frames;

    instantaneously estimating plurality of parameters associated with at least one distortion or attack on the electronic media signal;

    estimating a type and a strength of distortions or attacks occurring simultaneously on the electronic media signal;

    synchronously generating a set of candidate templates for each frame using the plurality of parameters, wherein each candidate template of the set of candidate templates is configured with a predictively designed cross correlation filter;

    obtaining a Peak to Side lobe Ratio (PSR) score for each candidate template;

    obtaining a maximum PSR score from the PSR score associated with each candidate template for each frame of the electronic media signal to obtain a classifier for each frame;

    determining a correlation output between each candidate template and each frame of the electronic media signal based upon the PSR score;

    detecting a watermark for each frame, using the classifier of each frame, when the maximum PSR score commensurates with a predefined threshold value; and

    determining presence of the watermark in the electronic media signal using one or more fusion rules applied on the correlation output of each frame.

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