Method and apparatus for enhancing digital image quality

Details Method and apparatus for enhancing digital image quality Method and apparatus for enhancing digital image quality

2007-01-30

2007-01-30

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900, C382S254000, C382S260000, C382S274000, C347S248000, C347S248000, C347S248000, C347S248000

Reexamination Certificate

active

10653452

ABSTRACT:
A method of and an apparatus for enhancing digital image quality. Input color data are transformed to obtain brightness data and chrominance data. The transformed brightness data is compared with predetermined brightness levels X1and X2on a pixel by pixel basis and the brightness data of each concerned pixel is reset or output without change according to the comparison. The comparison identifies the concerned pixel as belonging to one of a dark area and a light area requiring contrast enhancement and the brightness level of the concerned pixel is adjusted to provide the enhanced contrast. The obtained chrominance data and the reset brightness data are inversely transformed into corresponding color data. The predetermined brightness levels X1and X2are adaptively recomputed after a last pixel in a concerned line is considered for contrast enhancement.

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patent: 2004/0197021 (2004-10-01), Huang et al.
patent: 2005/0088695 (2005-04-01), Fuchigami
patent: 920 193 (1999-06-01), None

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