Television – Image signal processing circuitry specific to television – Gray scale transformation
Reexamination Certificate
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.
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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
Koninklijke Philips Electronics , N.V.
Yenke Brian P.
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