System for controlling the amount of light reaching an image pic

Details System for controlling the amount of light reaching an image pic System for controlling the amount of light reaching an image pic

1987-11-20

1989-06-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, H04N 5235, H04N 5238

Patent

active

048434760

ABSTRACT:
A light signal control circuit for an image pick-up apparatus detects a substantially peak value of image pick-up signals by a first level detection circuit, detects a substantially average value of the image pick-up signals by a second level detection circuit, determine a brightness condition of an object by a decision circuit, weights the outputs of the first level detection circuit and the second level detection circuit by a weighting circuit, and controls the amount of light reaching an image pick-up apparatus in accordance with an output of the weighting circuit. Optimum light control corresponding to the brightness condition of the object is attained by controlling the weighting operation in accordance with an output of the decision circuit.

REFERENCES:
patent: 4516172 (1985-05-01), Miyata et al.
patent: 4638350 (1987-01-01), Kato et al.
patent: 4717960 (1988-01-01), Shikano et al.

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