Adaptive contrast enhancement method for video signals based...

Television – Image signal processing circuitry specific to television – Gray scale transformation

Reexamination Certificate

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C348S678000, C348S625000, C382S274000

Reexamination Certificate

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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.

REFERENCES:
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patent: 7042522 (2006-05-01), Kim
patent: 2003/0025838 (2003-02-01), Kim
U.S. Appl. No. 10/892,775, filed Jul. 16, 2004, Kim.
W.K. Pratt,Digital Image Processing, Wiley Interscience, 1991, pp. 263-284, 2nded., New York.
A.K. Jain,Fundamentals of Digital Image Processing, Prentice Hall, 1989, pp. 235, 241-244, Englewood Cliffs.

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