Image pickup apparatus for clamping optical black level to a...

Details Image pickup apparatus for clamping optical black level to a... Image pickup apparatus for clamping optical black level to a...

2005-09-20

2009-06-23

Vu, Ngoc-Yen T (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S241000

Reexamination Certificate

active

07551212

ABSTRACT:
An image pickup apparatus includes an imaging device configured to convert an optical image of an object into an electrical signal, an optical black level extraction unit configured to extract an optical black level included in an image signal obtained by photoelectric conversion by the imaging device, a blanking level extraction unit configured to extract a blanking level in a blanking period of the image signal, an abnormality detection unit configured to detect an abnormality of the optical black level, and a clamp unit configured, at a normal time when the abnormality is not detected by the abnormality detection unit, to clamp the optical black level to a first target value with the optical black level extracted by the optical black level extraction unit as a reference, and at an abnormal time when the abnormality is detected by the abnormality detection unit, to clamp the optical black level to a second target value with the blanking level extracted by the blanking level extraction unit as a reference.

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patent: 2003-143488 (2003-05-01), None

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