Image signal processing apparatus and image signal...

Details Image signal processing apparatus and image signal... Image signal processing apparatus and image signal...

2007-08-23

2011-11-15

Harold, Jefferey (Department: 2422)

Television

Image signal processing circuitry specific to television

Brightness control

C348S691000, C348S695000, C348S257000, C348S572000, C348S571000

Reexamination Certificate

active

08059205

ABSTRACT:
An image signal processing apparatus includes a clamp circuit that clamps an image signal having a horizontal synchronization signal, an optical black level period representing an optical black level, and an effective signal period representing an image signal for one horizontal line so as to clamp a value offset from the image signal on the basis of a first reference value during the optical black level period and to clamp the image signal on the basis of a second reference value different from the first reference value during the effective signal period, and a level computation circuit that determines the second reference value on the basis of a signal level clamped during the optical black level period.

REFERENCES:
patent: 6580465 (2003-06-01), Sato
patent: 2005/0157214 (2005-07-01), Takahashi et al.
patent: 2000-13637 (2000-01-01), None
patent: 2005-150802 (2005-06-01), None

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