Unit for and method of video signal enhancement and image...

Details Unit for and method of video signal enhancement and image... Unit for and method of video signal enhancement and image...

2005-09-13

2005-09-13

Yenke, Brian P. (Department: 2614)

Television

Image signal processing circuitry specific to television

Gray scale transformation

C348S603000, C348S625000, C348S673000

Reexamination Certificate

active

06943848

ABSTRACT:
A video signal enhancement unit (100) and an image display apparatus containing the unit have a processing unit (102) for contrast modification of the video signal. The processing unit (102) receives input data from a contrast counter (112), designed to store a contrast count. The contrast count is decreased by a pixel counter (104) each time the total number of pixels which have video signal levels that are higher than a predetermined video level, exceeds a predefined threshold. The contrast count is increased each time a trigger means (114) generates a pulse. A contrast comparator (116) can be coupled to the contrast counter (112) to limit the contrast count to a maximum contrast value.

REFERENCES:
patent: 5422680 (1995-06-01), Lagoni et al.
patent: 5808697 (1998-09-01), Fujimura et al.
patent: 5995161 (1999-11-01), Gadre et al.
patent: 6285413 (2001-09-01), Akbayir
patent: 6600519 (2003-07-01), Hwang
patent: 6809776 (2004-10-01), Simpson

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