Image signal coding apparatus

Details Image signal coding apparatus Image signal coding apparatus

1986-07-23

1989-01-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 140

Patent

active

047991100

ABSTRACT:
An image signal coding apparatus includes reference and coding line change point detection circuits, reference line shift registers, a coding line shift register, a symbol detection circuit, coding and reference line ROM tables, and a code determination circuit. The coding line change point detection circuit receives a serial reference line image signal in synchronism with a serial coding line image signal. The reference line shift registers receive serial change point data in the reference line image signal and output parallel reference line change point data. The coding line shift register receives serial change point data in the coding line image signal and outputs parallel coding line change point data. The symbol detection circuit monitors output states of the reference and coding line shift registers. A run length counter counts the number of pixels between the change points in the coding line image signal. The ROM tables cooperate with the code determination circuit to code the coding line image signal in response to outputs from the symbol detection circuit and the run length counter.

REFERENCES:
patent: 4543612 (1988-09-01), Matsunaga et al.
patent: 4688100 (1987-08-01), Hagamuma et al.
patent: 4701803 (1987-10-01), Sato

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