Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY
Volume 24, Issue 4, Pages 576-590Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSVT.2013.2276154
Keywords
Backlight scaling; brightness compensation; contrast enhancement; histogram modification; low-power image processing; power management; transmissive liquid crystal display (LCD)
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Funding
- National Research Foundation of Korea (NRF) Grant
- Korea government (MSIP) [2012-011031, 2011-0031648]
- Global Frontier Research and Development Program on Human-centered Interaction for Coexistence
- NRF
- National Research Foundation of Korea [2011-0031648, 21A20131612106, 2012R1A2A2A01011031] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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