Method and apparatus for adjusting contrast of image

Details Method and apparatus for adjusting contrast of image Method and apparatus for adjusting contrast of image

2011-07-05

2011-07-05

Tran, Trang U (Department: 2422)

Television

Image signal processing circuitry specific to television

Gray scale transformation

C348S603000, C348S674000, C348S673000

Reexamination Certificate

active

07973860

ABSTRACT:
This invention relates to an apparatus for processing an input image including M input pixels. Each of the M input pixels respectively has an input gray scale. The apparatus includes a gain generating module, a contrast enhancing module, and a Gamma adjusting module. The gain generating module generates a contrast gain and a minimum input gray scale in accordance with the input gray scales of the M input pixels. The contrast enhancing module adjusts the input gray scales in accordance with the contrast gain and the minimum input gray scale, to generate an intermediate image. The intermediate image includes M intermediate pixels, and each of the M intermediate pixels respectively has an intermediate gray scale. The Gamma adjusting module adjusts the intermediate gray scales lower than a first threshold in accordance with the contrast gain and outputs the adjusted intermediate image as an output image.

REFERENCES:
patent: 6351558 (2002-02-01), Kuwata
patent: 6915024 (2005-07-01), Maurer
patent: 7127123 (2006-10-01), Wredenhagen et al.
patent: 7573533 (2009-08-01), Moldvai
patent: 2006/0239581 (2006-10-01), Neuman
patent: 1956495 (2005-10-01), None

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