Television – Image signal processing circuitry specific to television – Gray scale transformation
Reexamination Certificate
2007-05-22
2007-05-22
Tran, Trang U. (Department: 2622)
Television
Image signal processing circuitry specific to television
Gray scale transformation
C348S678000, C348S625000, C382S274000
Reexamination Certificate
active
10641970
ABSTRACT:
An adaptive contrast enhancement (ACE) method and apparatus provide a natural enhancement in accordance with the time-varying characteristics of a video sequence. Characteristics of a time varying video sequence are specified and a nonlinear transform over the input video sequence is performed to enhance mainly the contrast of the input. A probability density function (PDF) of a time varying input video sequence is computed and then some predetermined video parameters relating to contrast is extracted from the PDF. Based upon the extracted video parameters, a nonlinear transform function is then constructed and updated as a look up table (LUT), which is synchronized with the associated video picture or field SYNC signal. The transform LUT is then applied to the input video to provide an enhanced video output signal.
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Myers Dawes Andras & Sherman LLP
Samsung Electronics Co,. Ltd.
Sherman, Esq. Kenneth L.
Tran Trang U.
Zarrabian, Esq. Michael
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