Image analysis – Image compression or coding – Predictive coding
Patent
1996-01-19
1998-03-10
Boudreau, Leo
Image analysis
Image compression or coding
Predictive coding
348409, 382232, G06K 936, G06K 946, H04N 1102, H04N 712
Patent
active
057270880
ABSTRACT:
When a data error is generated in a macroblock in a Bidirectionally-predictive coded picture (i.e., a B-picture), error concealment is performed on the macroblock. In the situation where the macroblock in the row just above and in the same column as the error-generated macroblock is an intra macroblock, the intra macroblock cannot be used to provide a motion vector for use in error concealment. In such a case, a method is provided to obtain a motion vector for the error-generated macroblock by taking the arithmetic average of the motion vectors of the macroblocks which are on each side of the macroblock just above the error-generated macroblock and in the same column. Error concealment by motion compensation is performed with respect to the corresponding macroblock in the same position in the B-picture which is either forward or backward in time sequence. Choice of whether the forward or backward B-picture is to be used is made adaptively, based upon whether a scene change is determined to have occurred.
REFERENCES:
patent: 5150210 (1992-09-01), Hoshi et al.
patent: 5243428 (1993-09-01), Challapali et al.
patent: 5247363 (1993-09-01), Sun et al.
patent: 5410553 (1995-04-01), Choon
patent: 5455629 (1995-10-01), Sum et al.
Boudreau Leo
Chen Wenpeng
Samsung Electronics Co,. Ltd.
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