Image signal processing apparatus and method

Details Image signal processing apparatus and method Image signal processing apparatus and method

2004-02-27

2009-06-09

Tran, Trang U (Department: 2622)

Television

Image signal processing circuitry specific to television

Gray scale transformation

C348S677000, C348S712000

Reexamination Certificate

active

07545443

ABSTRACT:
In a conventional contrast adjustment circuit, since an entire signal level of a luminance signal is shifted, peak luminance is lowered, and luminance deterioration is undesirably raised. In the present invention, a direct-current component of a luminance signal is shifted according to need, and a predetermined expansion processing to increase a signal level of highlight portion is performed for a luminance signal having its direct-current component shifted.

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Patent Abstracts of Japan, publication No. 10-271409, publication date Oct. 9, 1998.

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