Image analysis – Image compression or coding – Adaptive coding
Patent
1998-06-19
1999-10-26
Chang, Jon
Image analysis
Image compression or coding
Adaptive coding
348404, 348431, G06K 936
Patent
active
059741856
ABSTRACT:
Plurality of encoding methods and apparatus for encoding video data in a manner that makes it well suited for decoding by either regular or downconverting decoders are described. In one embodiment, the selection and/or generation of motion vectors by an encoder is controlled so that only motion vectors having a size that corresponds to an integer multiple of a downsampling rate expected to be used by a downconverting decoder are generated and/or selected. In another embodiment, motion vectors having a size which corresponds to an integer multiple of an expected downsampling rate are preferred over other motion vectors. In various additional encoder embodiments feedback circuitry which models a downconverting decoder, and/or which provides feedback information on downconverted images generated by decoding the compressed video data generated by the encoder using a downconverting decoder, are incorporated into the encoder of the present invention.
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Boyce Jill
Pearlstein Larry
Chang Jon
Hitachi America Ltd.
Michaelson Peter L.
Patel Jayanti K.
Straub Michael P.
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