Image analysis – Applications
Patent
1998-01-16
2000-05-16
Au, Amelia
Image analysis
Applications
348461, 380200, G06K 900
Patent
active
060647485
ABSTRACT:
A method and apparatus for embedding and retrieving an additional data bitstream in an encoded data stream, such as MPEG. The embedded data is processed and a choice parameter in the header portion of the encoded data stream is varied according to the embedded information bit pattern. Optimization of the encoded data stream is not significantly affected. The embedded information is robust in that the encoded data stream would need to be decoded and re-encoded in order to change a bit of the embedded information. As relevant portions of the header are not scrambled to facilitate searching and navigation through the encoded data stream, the embedded data can generally be retrieved even when the encoded data stream is scrambled.
REFERENCES:
patent: 5768535 (1998-06-01), Chaddha et al.
patent: 5809139 (1998-09-01), Girod et al.
patent: 5821986 (1998-10-01), Yuan et al.
patent: 5923811 (1999-07-01), Kawamura et al.
patent: 5930369 (1999-07-01), Cox et al.
patent: 5937095 (1999-08-01), Machida
Information technology--Generic coding of moving pictures and associated audio information: Video (ITU-T Rec. H.262 (1995E), from Internatation Standard ISO/IEC 13818-2, First Edition May 15, 1996, pp. 39 and 50.
Au Amelia
Bali Vikkram
Hewlett--Packard Company
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