Image analysis – Image enhancement or restoration
Reexamination Certificate
2005-07-05
2008-09-16
Ahmed, Samir A (Department: 2624)
Image analysis
Image enhancement or restoration
C382S274000
Reexamination Certificate
active
07426312
ABSTRACT:
A method and system for contrast enhancement of an input image that utilizes luminance values of pixels of the input image to derive transforms. The method down-samples and partitions an image into sub-images whereby transforms are generated for selected sub-images. The selected sub-image transforms are used to generate an output transform which is applied to the input image for local contrast enhancement of the image. Furthermore, a decision method as to whether or not the input image is to receive local contrast enhancement wherein darkness features of the input image are compared to threshold values and combined into an expression which results in the determination.
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Arregui Damian
Dance Christopher R.
Ahmed Samir A
Fay Sharpe LLP
Koziol Stephen R
Xerox Corporation
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