Method and apparatus for encoding a video signal employing trans

Details Method and apparatus for encoding a video signal employing trans Method and apparatus for encoding a video signal employing trans

1995-05-02

1996-10-01

Kostak, Victor R.

Television

Bandwidth reduction system

Data rate reduction

348398, H04N 726

Patent

active

055614647

ABSTRACT:
A novel apparatus for improving the overall compression efficiency comprises: a transformer for transforming an input video signal into a plurality of subbands of transform coefficients, wherein one subband which exists in the lowest frequency band includes one or more DC coefficients, the remaining subbands contain a multiplicity of AC coefficients, respectively; a converter for converting the transform coefficients included in the plurality of subbands into a number of assembled blocks with a predetermined identical size, each of the blocks having one DC coefficient and a plurality of AC coefficients; a generator for generating a selection signal representing a class for each of the assembled blocks; first encoder for encoding the DC coefficients of the assembled blocks, to thereby generate a first encoded video signal; a second encoder, responsive to the selection signal, and for encoding the AC coefficients of each of the assembled blocks, to thereby produce a second encoded video signal; and a formatter for formatting the first encoded video frame signal and the second encoded video frame signal.

REFERENCES:
patent: 5128757 (1992-07-01), Citta et al.
patent: 5339164 (1994-08-01), Lim
patent: 5420636 (1995-05-01), Kojima
patent: 5442399 (1995-08-01), Asamura et al.

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