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Derivation and quantization of robust non-local characteristics for blind watermarking

  • US 7,634,660 B2
  • Filed: 12/15/2004
  • Issued: 12/15/2009
  • Est. Priority Date: 04/24/2001
  • Status: Expired due to Fees
First Claim
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1. A system facilitating protection of digital signals, the system comprising:

  • a means for processing;

    a means for storing coupled to the means for processing;

    a means for obtaining a digital signal, wherein the digital signal comprises multi-dimensional data;

    a means for partitioning the digital signal into a plurality of segments, wherein the partitioning comprises pseudorandomly segmenting the signal, wherein the plurality of segments are pseudorandomly positioned, such that said segments have the ability to overlap;

    a means for calculating for one or more segments statistics of a segment that are representative of that segment;

    a means for quantizing such statistics of a segment to watermark the signal using quantization index modulation (QIM), wherein the statistics associated with at least one said segment are determined using non-local characteristics of at least two said segments, and wherein the at least two segments of the signal are pseudorandomly dimensioned;

    a means for generating a marked signal equivalent to a combination of the digital signal and the combination of the quantized statistics of the one or more segments, wherein the generating comprises embedding a watermark via quantization index modulation (QIM).

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