Method and apparatus for dynamic image contrast expansion

Details Method and apparatus for dynamic image contrast expansion Method and apparatus for dynamic image contrast expansion

2006-04-25

2009-10-27

Do, Anh Hong (Department: 2624)

Image analysis

Histogram processing

With a gray-level transformation

C382S168000

Reexamination Certificate

active

07609886

ABSTRACT:
The present invention discloses a method and an apparatus for applying a dynamic contrast expansion technique to plasma display panels through performing a gamma conversion for the inputted image to convert the relationship of the brightness and gray level of the inputted image into a linear relation, performing a subtraction for the gray level value of the image to maintain the image at its smallest color deviation, analyzing the image property histogram to compute the maximum gray level and the minimum gray level required for carrying out the image contrast expansion and obtaining an image contrast expansion gain, and adopting an average of several previously inputted image contrast expansion gains and a current image contrast expansion gain as the contrast expansion gain used in the actual contrast expansion gain formula, so as to compute a new outputted gray level value after the image contrast expansion is performed.

REFERENCES:
patent: 6664973 (2003-12-01), Iwamoto et al.

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