Image processing apparatus
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United States of America Patent
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Jul 12, 2011
Grant Date -
Sep 11, 2008
app pub date -
Mar 6, 2008
filing date -
Mar 7, 2007
priority date (Note) -
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Abstract
The invention discloses an image processing apparatus for adjusting lightness of an input image. The image processing apparatus includes a first processing module, a second processing module, a third processing module, and a fourth processing module. The first processing module is used for generating a lightness histogram with reference to the input image and determining a maximum lightness and an average lightness according to the lightness histogram. The second processing module is used for determining a first gain and a second gain according to the maximum lightness and a look-up table. The third processing module is used for selecting a lightness adjusting curve according to the average lightness. The fourth processing module is used for generating an output lightness corresponding to the input image.
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