Television – Bandwidth reduction system – Data rate reduction
Patent
1991-10-31
1995-05-09
Herndon, Heather R.
Television
Bandwidth reduction system
Data rate reduction
348416, H04N 713
Patent
active
054144698
ABSTRACT:
A system and method for processing a stream of video image data so as to create a video representation that multiplexes data corresponding to resolution or bitstream scales. This representation is such that the identity of the basic MacroBlock (MB) structure of the MPEG-1 ISO standard is preserved across all resolution and bitstream scales, e.g. by scaling across four levels of resolution. A MacroBlock is associated with a series of attributes which contribute to the amount of overhead data incorporated in an MPEG-1 compressed data stream, so that by preserving the MacroBlock identify across multiple resolutions and bitstream scales, these scales can share this overhead, thus requiring it to be included only once in the data stream. Preserving the MacroBlock identify also simplifies significantly the derivation of motion estimation vector data for all resolution scales other than the highest resolution. Essentially, the motion vector data corresponding to any resolution scales can be derived from the highest resolution motion vector by appropriately scaling it down. Alternatively, the full resolution motion vectors can be derived by appropriate scale up of lower resolution motion vectors. Further, the methodology for coding a MacroBlock is also preserved.
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Gonzales Cesar A.
Ramm Dov
Viscito Eric
Burraston N. Kenneth
Dowd Thomas P.
Herndon Heather R.
International Business Machines - Corporation
Ludwin Richard M.
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