Method and device for inserting and detecting a watermark in digital data
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United States of America Patent
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Jan 6, 2004
Grant Date -
N/A
app pub date -
Oct 13, 1999
filing date -
Oct 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a method of inserting an additional information item in a set of digital data representing physical quantities, the data having been processed by transformation, quantization and entropic coding in order to be compressed, characterized in that it comprises the steps of extracting a subset of low-frequency coefficients, from the set of data, entropic decoding of the coefficients of the subset, modulation of the decoded coefficients by a signal representing the additional information item, so as to form quantized watermarked coefficients, entropic coding of the watermarked coefficients, and insertion of the watermarked encoded coefficients in place of the coefficients of the subset, in the set of data.
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