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High power-saving and fidelity-conserving object-based local dimming for LCD systems with LED-based backlight units

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Abstract

A local dimming technique which is enabled on LED-based LCD systems is expected to give more power saving than a global one. However, prior local dimming techniques have not considered human visual system-awareness much as done in an advanced global dimming technique. In this paper, we propose a novel local dimming technique using an object-based approach for both good human visuality and high power saving. It utilizes prevalent colors of individual objects in a given image to do initial dimming, and then enhances the image using a proper fidelity threshold to reduce visible artifacts. Experimental results show that the proposed technique achieves power saving up to 13 and 12 times higher than human visual system-aware global dimming and prior well-designed local dimming techniques, respectively, with a similar human visual system-aware image quality level in a uniform backlight optical profile. It achieves power saving up to 15 and 6 times higher in a Gaussian-based backlight optical profile. Due to a good use of a simpler image fidelity metric, the proposed technique also can make the complexity go lower while keeping a satisfactory image quality.

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Acknowledgements

An earlier version of this paper appeared in the Proceedings of International Symposium on Low Power Electronics and Design (ISLPED) 2011, Fukuoka, Japan. This work was supported by the new faculty research fund of Ajou University. This work was partially supported by the Ajou university research fund.

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Authors and Affiliations

  1. Ministry of Communications and Information Technology of Republic of Indonesia, Jakarta, 10110, Indonesia

    Aldhino Anggorosesar

  2. Department of Electrical and Computer Engineering, Ajou University, San 5, Woncheon-dong, Yeongtong-gu, Suwon, 443-749, Korea

    Young-Jin Kim

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  1. Aldhino Anggorosesar
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  2. Young-Jin Kim
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Correspondence to Young-Jin Kim.

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Anggorosesar, A., Kim, YJ. High power-saving and fidelity-conserving object-based local dimming for LCD systems with LED-based backlight units. Multimed Tools Appl 72, 1115–1141 (2014). https://doi.org/10.1007/s11042-013-1425-9

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