Image analysis – Image compression or coding – Including details of decompression
Patent
1995-04-18
1998-03-03
Boudreau, Leo
Image analysis
Image compression or coding
Including details of decompression
382236, 348402, 348416, G06K 936, G06K 946
Patent
active
057244464
ABSTRACT:
An video decoder system, such as for use with MPEG video compression, uses a previous B-frame as an additional prediction source for the current B-frame, along with the past and future reference frames as defined by the MPEG specification. In one embodiment a given macroblock within a current B-frame "N" reuses pixel values from the previous B-frame "N-1" if they are "similar enough" to the anticipated pixels which would otherwise need to be computed. For a given macroblock, motion vectors for both B-frames are compared: if they differ by less than a similarity threshold value, then the pixel values from the previous B-frame are reused without further computation. The similarity threshold may be adaptively adjusted to reduce the computational burden of video decompression, while affording a gradual degradation of picture quality, rather than wholesale skipping of entire frames.
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Liu Yi
Strongin Geoffrey S.
Tucker Michael R.
Advanced Micro Devices , Inc.
Boudreau Leo
Graham Andrew C.
Tran Phuoc
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