Advances in Multimedia

Advances in Multimedia / 2007 / Article
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Cross-layer Optimized Wireless Multimedia Communications

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Research Article | Open Access

Volume 2007 |Article ID 83715 | 10 pages |

Quality-Based Backlight Optimization for Video Playback on Handheld Devices

Academic Editor: Haohong Wang
Received18 Dec 2006
Accepted23 Apr 2007
Published04 Jul 2007


For a typical handheld device, the backlight accounts for a significant percentage of the total energy consumption (e.g., around 30% for a Compaq iPAQ 3650). Substantial energy savings can be achieved by dynamically adapting backlight intensity levels on such low-power portable devices. In this paper, we analyze the characteristics of video streaming services and propose a cross-layer optimization scheme called quality adapted backlight scaling (QABS) to achieve backlight energy savings for video playback applications on handheld devices. Specifically, we present a fast algorithm to optimize backlight dimming while keeping the degradation in image quality to a minimum so that the overall service quality is close to a specified threshold. Additionally, we propose two effective techniques to prevent frequent backlight switching, which negatively affects user perception of video. Our initial experimental results indicate that the energy used for backlight is significantly reduced, while the desired quality is satisfied. The proposed algorithms can be realized in real time.


  1. A. Azevedo, R. Cornea, I. Issenin et al., “Architectural and compiler strategies for dynamic power management in COPPER project,” in Proceedings of International Workshop on Innovative Architecture (IWIA '01), Maui, Hawaii, USA, January 2001. View at: Google Scholar
  2. K. Choi, W.-C. Cheng, and M. Pedram, “Frame-based dynamic voltage and frequency scaling for an MPEG player,” Journal of Low Power Electronics, vol. 1, no. 1, pp. 27–43, 2005. View at: Publisher Site | Google Scholar
  3. S. Chandra, “Wireless network interface energy consumption: implications for popular streaming formats,” Multimedia Systems, vol. 9, no. 2, pp. 185–201, 2003. View at: Publisher Site | Google Scholar
  4. M. Stemm, P. Gauthier, D. Harada, and R. H. Katz, “Reducing power consumption of network interfaces in hand-held devices,” in Proceedings of the 3rd International Workshop on Mobile Multimedia Communications (MoMuc '96), Princeton, NJ, USA, September 1996. View at: Google Scholar
  5. S. Pasricha, M. Luthra, S. Mohapatra, N. Dutt, and N. Venkatasubramanian, “Dynamic backlight adaptation for low-power handheld devices,” IEEE Design and Test of Computers, vol. 21, no. 5, pp. 398–405, 2004. View at: Publisher Site | Google Scholar
  6. N. Chang, I. Choi, and H. Shim, “DLS: dynamic backlight luminance scaling of liquid crystal display,” IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol. 12, no. 8, pp. 837–846, 2004. View at: Publisher Site | Google Scholar
  7. W.-C. Cheng, Y. Hou, and M. Pedram, “Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling,” in Proceedings of Design, Automation and Test in Europe Conference and Exhibition (DATE '04), vol. 1, pp. 252–257, Paris, France, February 2004. View at: Google Scholar
  8. S. Wolf and M. H. Pinson, “Spatial-temporal distortion metrics for in-service quality monitoring of any digital video system,” in Proceedings of the Multimedia Systems and Applications II, vol. 3845 of Proceedings of SPIE, pp. 266–277, Boston, Mass, USA, September 1999. View at: Publisher Site | Google Scholar
  9. M. H. Pinson and S. Wolf, “A new standardized method for objectively measuring video quality,” IEEE Transactions on Broadcasting, vol. 50, no. 3, pp. 312–322, 2004. View at: Publisher Site | Google Scholar
  10. J. L. Zachary, Introduction to Scientific Programming: Computational Problem Solving Using Maple and C., Telos Publishers, Surrey, UK, 1996.

Copyright © 2007 Liang Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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