Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1997-06-24
1999-10-26
Chevalier, Robert
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386111, A04N 5917, A04N 726
Patent
active
059742240
ABSTRACT:
A method for decoding video signals comprising decoding a bit stream, and reproducing a video signal in reverse order of frames, the bit stream including each frame of the video signal which has been encoded using one of an intra coding system (I picture), a predictive coding system (P picture), and a bidirectionally predictive coding system (B picture), includes a group of frames including at least one frame of I picture, which can be decoded from the I picture and consecutively reproduced in order of the frames, being called a GOP (Group of Pictures); the frames being output in reverse order of the frames to obtain a desired frame, wherein: when the desired frame is one of I picture and P picture, only the I picture and P pictures from the first I picture in a GOP to the desired frame are decoded; and when the desired frame is B picture, only the desired frame is decoded if reference frames required for decoding of the desired frame are present in frame memories. As described above, in the method for decoding video signals according to the present invention, decoding processing of a desired frame is performed each time to output a reproduced image. Consequently, an increase in circuit scale can be avoided, resulting in smooth backward reproduction with a small memory capacity.
REFERENCES:
patent: 4931879 (1990-06-01), Koga et al.
patent: 5377051 (1994-12-01), Lane et al.
patent: 5493456 (1996-02-01), Augenbraun et al.
Chevalier Robert
Matsushita Electric - Industrial Co., Ltd.
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