Moving image signal coding system

Details Moving image signal coding system Moving image signal coding system

1987-11-09

1989-06-06

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, H04N 712

Patent

active

048376183

ABSTRACT:
A system of coding moving image signals produces a predictive error signal by a predictive coding based on inter-frame correlation and quantizing the predictive error signal for each block of a picture frame constituted by N lines of M pixels. The system includes a block coding
on-coding decision unit for calculating a first evaluation value Sm of the predictive error signal for each block of the picture frame. This unit decides that block non-coding is applicable when the first evaluation value Sm is less than a first threshold value T.sub.1 and that block coding is applicable when the first evaluation value Sm is greater than the first threshold value T.sub.1. The predictive error signal is not transmitted when the result of the decision is for block non-coding, and the predictive error signal is quantized and transmitted when the result of the decision is for block coding.

REFERENCES:
patent: 3185824 (1965-05-01), Blasbalg et al.
patent: 4077053 (1978-02-01), Ishiguro
patent: 4546386 (1985-10-01), Matsumoto et al.
patent: 4723161 (1988-02-01), Koga

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