Visual-Quality Guided Global Backlight Dimming for Video Display on Mobile Devices

Chia Hung Yeh*, Kyle Shih Huang Lo, Weisi Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This proposes a visual-quality guided global backlight dimming (VQG-GBD) algorithm to reduce the power consumption of liquid-crystal display on mobile devices. We build a backlight scaling ratio (BSR) prediction model via visual-quality assessment that not only considers the display contents but also the backlight intensity while measuring video quality. Also, we add visual uncertainty as an indicator to dim the backlight without being noticed by observers. The VQG-GBD includes a training stage and an online stage. For the training stage, first, we collect videos with distinct attributes of brightness and uncertainty. Then, the subjective rating obtains the relationship among the visual quality, BSR, brightness, and visual uncertainty. Finally, we use the trust-region method to build the BSR prediction model. In the online stage, the model is applied to mobile devices for real-time video display and a BSR optimization strategy is proposed to eliminate the flicker effect between frames, followed by three techniques to accelerate the process: 1) motion vector extraction; 2) pixel subsampling to reduce the computation while analyzing frame content; and 3) GPU rendering to speed up the pixel compensation. The experimental results show that VQG-GBD achieves 21% of the power demand reduction on average for displaying videos on mobile devices while preserving good visual quality. The VQG-GBD delivers more power reduction than the state-of-the-art algorithm image integrity-based gray-level error control and multi-histogram-based gray-level error control by 10% and 8%, respectively.

Original languageEnglish
Article number8519755
Pages (from-to)3393-3403
Number of pages11
JournalIEEE Transactions on Circuits and Systems for Video Technology
Volume29
Issue number11
DOIs
Publication statusPublished - 2019 Nov

Keywords

  • ACR11
  • Global backlight dimming
  • liquid-crystal display
  • mobile devices
  • subjective visual quality assessment
  • trust-region method
  • visual uncertainty

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering

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