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Proceedings Paper

An efficient contents-adaptive backlight control method for mobile devices
Author(s): Qiao Song Chen; Ya Xing Yan; Xiao Mou Zhang; Hua Cai; Xin Deng; Jin Wang
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Paper Abstract

For most of mobile devices with a large screen, image quality and power consumption are both of the major factors affecting the consumers’ preference. Contents-adaptive backlight control (CABC) method can be utilized to adjust the backlight and promote the performance of mobile devices. Unlike the previous works mostly focusing on the reduction of power consumption, both of image quality and power consumption are taken into account in the proposed method. Firstly, region of interest (ROI) is detected to divide image into two parts: ROI and non-ROI. Then, three attributes including entropy, luminance, and saturation information in ROI are calculated. To achieve high perceived image quality in mobile devices, optimal value of backlight can be calculated by a linear combination of the aforementioned attributes. Coefficients of the linear combination are determined by applying the linear regression to the subjective scores of human visual experiments and objective values of the attributes. Based on the optimal value of backlight, displayed image data are processed brightly and backlight is darkened to reduce the power consumption of backlight later. Here, the ratios of increasing image data and decreasing backlight functionally depend on the luminance information of displayed image. Also, the proposed method is hardware implemented. Experimental results indicate that the proposed technique exhibits better performance compared to the conventional methods.

Paper Details

Date Published: 11 March 2015
PDF: 10 pages
Proc. SPIE 9411, Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2015, 94110U (11 March 2015); doi: 10.1117/12.2087385
Show Author Affiliations
Qiao Song Chen, Chongqing Univ. of Posts and Telecommunications (China)
Ya Xing Yan, Chongqing Univ. of Posts and Telecommunications (China)
Xiao Mou Zhang, Chongqing Univ. of Posts and Telecommunications (China)
Hua Cai, Chongqing Univ. of Posts and Telecommunications (China)
Xin Deng, Chongqing Univ. of Posts and Telecommunications (China)
Jin Wang, Chongqing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 9411:
Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2015
Reiner Creutzburg; David Akopian, Editor(s)

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