Method of compressing image signals using vector quantization

Details Method of compressing image signals using vector quantization Method of compressing image signals using vector quantization

1988-02-25

1989-08-01

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358426, H04N 712

Patent

active

048537780

ABSTRACT:
A method of compressing image signals comprises the steps of dividing original image signals representing a two-dimensional image into blocks each of which is composed of a plurality of samples, converting the original image signals at respective picture elements in each of the blocks into n-valued system where n denotes an integer of 2 or larger, calculating means values m.sub.1, m.sub.2, . . . , m.sub.n of the original image signals at the respective picture elements in the block that have the common n-valued signals, and encoding the mean values m.sub.1, m.sub.2, . . . , m.sub.n and the n-valued signals. The mean values m.sub.1, m.sub.2, . . . , m.sub.n and/or the n-valued signals in each of the blocks are then subjected to vector quantization.

REFERENCES:
patent: 4541012 (1985-09-01), Tescher
patent: 4558350 (1985-12-01), Murakami
patent: 4670851 (1987-06-01), Murakami et al.
patent: 4710812 (1987-12-01), Murakami et al.

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