Optimization methods for the insertion, protection, and detection of digital watermarks in digital data

  • US 7,991,188 B2
  • Filed: 08/31/2007
  • Issued: 08/02/2011
  • Est. Priority Date: 07/02/1996
  • Status: Expired due to Fees
First Claim
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1. A system for encoding of digital watermark information in a signal, comprising:

  • at least one processor for processing data, said system configured to use said processor in performing functions for following elements;

    a window identifier for using time base alignment to identify sample windows in the signal to enable aligning watermark information amplitude values with sample windows;

    an interval calculator for determining a quantization interval of the sample window, where the quantization interval is used to quantize normalized window samples; and

    a sampler for normalizing the sample window to provide normalized samples, where the normalized samples conform to a limited range of values that are proportional to real sample values and comprise a representation of the real sample values with a resolution higher than the real range of values, and where the normalized values can be divided by the quantization interval into distinct quantization levels.

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