Accelerated access to frames from a compressed digital video...

Details Accelerated access to frames from a compressed digital video... Accelerated access to frames from a compressed digital video...

2002-08-22

2008-08-26

Tran, Thai (Department: 2621)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000, C386S349000, C386S349000, C386S349000, C386S349000

Reexamination Certificate

active

07418190

ABSTRACT:
A digital video recorder stores digital video streams having sequences of encoded frames that are predominantly non-keyframes. The digital video recorder synthesizes keyframes for the digital video stream by decoding the frames in sequence and occasionally capturing the state of the decoder as it decodes the frames. The decoder states are stored in a state index in association with the frames. During playback at normal or accelerated speeds, the digital video recorder is capable of random accelerated access of any frame in the digital video stream. A decoder state associated with the accessed frame is retrieved from the state index and used to begin decoding at or near the accessed frame. The decoder state initializes a playback decoder to the state that enables complete decoding and rendering of the accessed frame without having to decode multiple frames previous to the accessed frame, thereby minimizing time delays in playback.

REFERENCES:
patent: 4626828 (1986-12-01), Nishitani
patent: 7171594 (2007-01-01), Wyatt et al.
patent: 2002/0034374 (2002-03-01), Barton
patent: 2004/0247296 (2004-12-01), Nakatani et al.
patent: 2004/0264925 (2004-12-01), Harumoto et al.
patent: 2006/0056516 (2006-03-01), Hamamatsu et al.

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