Video contrast enhancement through partial histogram...

Details Video contrast enhancement through partial histogram... Video contrast enhancement through partial histogram...

2006-02-21

2006-02-21

Mancuso, Joseph (Department: 2621)

Image analysis

Histogram processing

C382S254000

Reexamination Certificate

active

07003153

ABSTRACT:
Methods and apparatus for video contrast enhancement are disclosed. A pixel level threshold is set for an input video frame in a video sequence. For pixel levels in the input video frame that are below the threshold, an adaptive contrast-enhancing function is applied. For other pixel levels, a scene-stable mapping function is applied.This contrast enhancement method can improve the contrast in darker areas of a scene depicted in the video sequence, without destroying the intended light levels for a scene or causing temporal brightness fluctuations in the enhanced video sequence.

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