Television camera equipped with continuously-variable-speed elec

Details Television camera equipped with continuously-variable-speed elec Television camera equipped with continuously-variable-speed elec

1994-07-01

1995-09-05

Razavi, Michael T.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348221, 348296, 348297, H04N 5335

Patent

active

054482933

ABSTRACT:
A television camera equipped with a continuously-variable-speed electronic shutter function which can control the charge-storing time of a solid-state image sensor and an amplifier so that a video signal follows the optimum light amount for a subject at high speed and with high accuracy. A shutter-equipped image sensor which is controlled by a shutter pulse generating unit, converts light incident on an optical lens into an electric signal. The electric signal, after being passed through an amplifier and a signal processing unit, is detected by a video level detecting unit as a video level. A shutter control unit holds the shutter amount corresponding to the video level for each field to immediately calculate an estimated shutter amount by using a predetermined equation, and supplies the calculated shutter amount to the shutter pulse generating unit for each field. A control mode decision unit exclusively controls a gain control unit serving as an AGC and the shutter control unit.

REFERENCES:
patent: 4635126 (1987-01-01), Kinoshita
patent: 4695888 (1987-09-01), Peterson
patent: 4843476 (1989-06-01), Fujioka et al.
patent: 5040070 (1991-08-01), Higashitsutsumi et al.
patent: 5157502 (1992-10-01), Nakajima et al.

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