Image signal processing apparatus and image pickup device

Details Image signal processing apparatus and image pickup device Image signal processing apparatus and image pickup device

1996-11-06

2000-10-31

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348224, H04N 5202, H04N 973

Patent

active

061410470

ABSTRACT:
Fine operation processing such as nonlinear processing is performed in units of frames in correspondence with each photographing frame. In order to effectively utilize the dynamic range of a digital processing circuit, there is provided an image processing apparatus which includes a varying circuit for varying the signal level in correspondence with the photographing contents, an A/D converter for converting an output varied by the varying circuit into a digital signal, an image memory for storing image information output from the A/D converter, an evaluation circuit for evaluating the image information, an operation circuit for performing operation processing of a signal output from the image memory, and a control circuit for controlling the varying circuit and the operation circuit on the basis of the evaluation result of the evaluation circuit. There is also provided an image pickup device in which the varying circuit includes an iris control circuit, a shutter speed control circuit, or a gain control circuit, and varies the signal level using the circuit.

REFERENCES:
patent: 4821100 (1989-04-01), Yamamoto
patent: 5185656 (1993-02-01), Yamamoto
patent: 5194960 (1993-03-01), Ota
patent: 5221963 (1993-06-01), Hashimoto et al.
patent: 6023533 (2000-02-01), Sano et al.

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