Fixed bit rate compression encoding method

Details Fixed bit rate compression encoding method Fixed bit rate compression encoding method

1992-07-13

1994-01-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 7133

Patent

active

052820319

ABSTRACT:
A fixed bit rate compression encoding method for dividing a two-dimensional video signal into DCT blocks and encoding the transform coefficients of each DCT block at a certain compression rate. The DC coefficient of each DCT block is scalar-quantized by l bits, each DCT block is classified into m classes according to its edge direction, AC coefficients of the classified DCT blocks are approximated to n representative vectors set for each class and are vector-scalar-quantized by p-bit indices of each representative vector, and the number B of encoding bits per block is generated at a fixed bit rate according to the expression: B=l+log.sub.2 m+n.times.p.

REFERENCES:
patent: 4963030 (1990-10-01), Makur
patent: 5144423 (1992-09-01), Knauer

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