Device and method for enhancing image contrast

Details Device and method for enhancing image contrast Device and method for enhancing image contrast

2006-09-05

2010-11-30

Le, Brian Q (Department: 2624)

Image analysis

Histogram processing

C382S274000

Reexamination Certificate

active

07844112

ABSTRACT:
We describe a device that dynamically increases the contrast of the effective gray level based on the gray level distribution of serial images, performs soft-transfer of dynamic contrast adjustment curve when a scene switch occurs thereby realizing adaptive contrast enhancing while effectively avoiding image flicker. A device and associated method for enhancing image contrast includes a gray level distribution statistic circuit to calculate gray level statistic data of an image responsive to an image brightness signal. An adaptive contrast mapping curve calculation circuit calculates a gray level mapping curve responsive to the gray level statistic data. An inter-frame curve soft-merging circuit performs inter-frame soft-merging to the gray level mapping curve. And a gray level mapping circuit performs gray level mapping of the input image brightness signal.

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