Encoding video signals using selective pre-filtering

Details Encoding video signals using selective pre-filtering Encoding video signals using selective pre-filtering

1994-10-31

1996-09-17

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348420, H04N 726

Patent

active

055573304

ABSTRACT:
Video frames to be encoded are divided into regions, which are then classified into different classes of regions. One or more different filters are then applied to the regions of different classes to generate pre-filtered video frames which are then further encoded to generate an encoded bit stream. In a preferred embodiment, the regions are classified into substantially changed regions and substantially unchanged regions. The pre-filtered video frames are generated by applying a temporal filter to the substantially unchanged regions and by applying a spatial filter to the substantially changed regions.

REFERENCES:
patent: 4821119 (1989-04-01), Gharavi
patent: 4942466 (1990-07-01), Sandbank et al.
patent: 5046071 (1991-09-01), Tanoi
patent: 5267334 (1993-11-01), Normille et al.
patent: 5313298 (1994-05-01), Meeker
patent: 5333012 (1994-07-01), Singhal et al.
patent: 5367629 (1994-11-01), Chu et al.
patent: 5440346 (1995-08-01), Alattar et al.

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