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Optimized Brightness Compensation and Contrast Enhancement for Transmissive Liquid Crystal Displays

Authors
Lee, ChulKim, Jin-HwanLee, ChulwooKim, Chang-Su
Issue Date
4월-2014
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Backlight scaling; brightness compensation; contrast enhancement; histogram modification; low-power image processing; power management; transmissive liquid crystal display (LCD)
Citation
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, v.24, no.4, pp.576 - 590
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY
Volume
24
Number
4
Start Page
576
End Page
590
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/98908
DOI
10.1109/TCSVT.2013.2276154
ISSN
1051-8215
Abstract
An optimized brightness-compensated contrast enhancement (BCCE) algorithm for transmissive liquid crystal displays (LCDs) is proposed in this paper. We first develop a global contrast enhancement scheme to compensate for the reduced brightness when the backlight of an LCD device is dimmed for power reduction. We also derive a distortion model to describe the information loss due to the brightness compensation. Then, we formulate an objective function that consists of the contrast enhancement term and the distortion term. By minimizing the objective function, we maximize the backlight-scaled image contrast, subject to the constraint on the distortion. Simulation results show that the proposed BCCE algorithm provides high-quality images, even when the backlight intensity is reduced by up to 50-70% to save power.
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공과대학 (전기전자공학부)
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