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Backlight Power Reduction Using Efficient Image Compensation for Mobile Devices

Authors
Kim, Tae-HyunChoi, Kang-SunKo, Sung-Jea
Issue Date
8월-2010
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Image enhancement; luminance compensation; DCT coefficients; LCD backlight control; mobile devices
Citation
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, v.56, no.3, pp.1972 - 1978
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS
Volume
56
Number
3
Start Page
1972
End Page
1978
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/115925
DOI
10.1109/TCE.2010.5606354
ISSN
0098-3063
Abstract
Since backlight dimming widely used for power reduction of mobile devices degrades the image quality in brightness and contrast, image enhancement is exploited to compensate the degradation. In this paper, we propose a novel backlight power reduction scheme using an efficient image compensation algorithm that scales discrete cosine transform (DCT) coefficients of image in the compressed domain. To reduce the computational burden of the conventional backlight dimming method where decompression is performed prior to image compensation in the spatial domain, we introduce a computationally efficient image compensation algorithm that processes only dominant DCT coefficients of images using a mapping function in the DCT domain. Experimental results indicate that our proposed method provides higher visual quality with reduced complexity as compared to conventional image compensation schemes(1).
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