Apparatus and method for controlling an iris according to bright

Details Apparatus and method for controlling an iris according to bright Apparatus and method for controlling an iris according to bright

1996-08-23

1999-07-13

Ho, Tuan V.

Television

Camera, system and detail

Optics

348364, H04N 5238

Patent

active

059233729

ABSTRACT:
An apparatus and a method for controlling an iris. The apparatus includes a data detector, a controller, and an iris controller using a feedback method, and further includes a buffer which stores an amplification ratio for modifying the input video signal to include a proper brightness level when the controller determines that adjustment of the iris is needed. An amplification ratio of 1 is stored when the controller determines that adjustment of the iris is not needed. A multiplier amplifies the input video signal by the amplification ratio stored in the buffer. As a result, a video signal having a proper brightness level is output.

REFERENCES:
patent: 4780766 (1988-10-01), Nutting
patent: 5455685 (1995-10-01), Mori
patent: 5473374 (1995-12-01), Shimizu et al.
Patent Abstracts of Japan, vol. 095, No. 002, Mar. 31, 1995, JP 06 311422 A, Nov. 4, 1994.

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