Apparatus and method for controlling black stretch of video...

Details Apparatus and method for controlling black stretch of video... Apparatus and method for controlling black stretch of video...

2005-10-04

2005-10-04

Hsia, Sherrie (Department: 2614)

Television

Cathode-ray tube display automatic black level bias control

C348S691000, C348S678000

Reexamination Certificate

active

06952235

ABSTRACT:
An apparatus and method for adaptively varying a black stretch control range and a gain according to a mean level of a video signal to control black stretch of the video signal. According to the apparatus and method, the slope and range of black stretch are varied depending on the mean of the input video signal, so black stretch compensation can be adaptively performed depending on the brightness of a screen. Particularly, black stretch compensation can be effectively performed on a dark screen.

REFERENCES:
patent: 5257108 (1993-10-01), Muraoka
patent: 5422680 (1995-06-01), Lagoni et al.
patent: 5515113 (1996-05-01), Takeshima
patent: 5548341 (1996-08-01), Klink et al.
patent: 6600519 (2003-07-01), Hwang
patent: 2001-0067348 (2001-07-01), None

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