Televison camera

Details Televison camera Televison camera

1992-06-16

1994-03-08

Razavi, Michael T.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348229, 348910, H04N 5335

Patent

active

052932389

ABSTRACT:
Flicker which occurs when a television camera images an object under illumination of a flickering light source such as fluorescent lamp is minimized without causing sensitivity of a photoelectric conversion element and hence the camera to be degraded under a non-flickering light source. The television camera includes an automatic iris control device, an automatic gain control circuit, a microcomputer, a photoelectric conversion element and an integration circuit for integrating output signal of the photoelectric conversion element for each field period. The microcomputer sets a signal storage time of the photoelectric conversion element to a value by which flicker noise can be restricted when flicker is detected on the basis of a change of an output signal of the integration circuit and sets it to another value when a change of light source is detected on the basis of a change of iris value and gain.

REFERENCES:
patent: 4670787 (1987-06-01), Levine
patent: 4774588 (1988-09-01), Noda et al.
patent: 4992855 (1991-02-01), Takei
patent: 5204741 (1993-04-01), Sakaguchi

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