Digital hidden data transport (DHDT)
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United States of America Patent
Stats
-
Dec 2, 2008
Grant Date -
Dec 9, 2004
app pub date -
May 26, 2004
filing date -
May 12, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for embedding auxiliary digital information into a primary digital signal to form a composite digital signal. Auxiliary data bits modulate a pseudo-random (e.g., PN) sequence to provide an auxiliary data sequence used to modify the Least Perceptually Significant Bits (LPSBs) of successive multi-bit samples of the primary signal. In a cross-term compensation embodiment, a correlation between the PN sequence and the sample bits is determined, and compared to the auxiliary data bits to determine whether there is a desired correspondence. The LPSBs in the samples are toggled, if necessary, to provide the desired correspondence. The selection of LPSBs to modify accounts for a desired noise level of the auxiliary data in the primary signal. LPSBs may be modified based on a sparse PN sequence to achieve the desired noise level and conceal the presence of the auxiliary data.
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Cited Art Landscape
Patent Citation Ranking
- 40 Citation Count
- H04N Class
- 77.63 % this patent is cited more than
- 17 Age
