Method and system for contrast enhancement of digital video

Details Method and system for contrast enhancement of digital video Method and system for contrast enhancement of digital video

2004-06-28

2008-09-09

Alavi, Amir (Department: 2624)

Image analysis

Histogram processing

With a gray-level transformation

C382S274000

Reexamination Certificate

active

07424148

ABSTRACT:
A method for enhancing the contrast of video pictures that includes the steps of receiving an input video signal; extracting a picture from said input video signal; determining an active window for said picture; calculating a histogram for luminance values of pixels in said active window of said picture; determining characteristics of said histogram; selecting one suitable mapping function from a plurality of mapping functions based on the determined characteristics of said histogram; and mapping the luminance value of each pixel in said picture in accordance with said selected mapping function.

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