Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Reexamination Certificate
2008-04-15
2008-04-15
Wu, Jingge (Department: 2624)
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
C382S168000, C382S169000, C382S254000, C345S617000
Reexamination Certificate
active
10699658
ABSTRACT:
A contrast compensation apparatus and a method thereof utilize a simplified hardware structure and a low contrast distortion. The contrast compensation apparatus includes a pixel value detection unit to detect a distribution of pixel values of respective pixels of an input image signal, a pixel value limit unit having pre-set luminance limit values and re-configuring the distribution of the pixel values of the respective pixels based on the pre-set luminance limit values, and a mapping unit to set luminance for the respective pixels based on a cumulative distribution function with respect to the re-configured pixel values. When certain portions of an image are rendered very bright or dark, the phenomenon in which the entire image becomes abruptly bright or dark is reduced. Further, the contrast compensation apparatus uses the minimum number of multipliers, adders, and subtractors only, thus having an advantage of simplified structure and using less electric power.
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Chinese Office Action for corresponding application 200310114817.3, dated Jul. 1, 2005.
Kang Hyun
Oh Jae-hwan
Park Yung-jun
Yang Seung-joon
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
Torres José M
Wu Jingge
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