JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE C 2013 Vol.14 No.5 P.374-382

http://doi.org/10.1631/jzus.C1200333

Statistically uniform intra-block refresh algorithm for very low delay video communication

Author(s): Rui Song, Yang-li Wang, Ye Han, Yun-song Li
Affiliation(s): State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an 710071, China
Corresponding email(s): ruiScientif@gmail.com
Key Words: Video coding, Intra refresh, Low delay

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Abstract: This paper focuses on the mechanism underlying the overall delay of a real-time video communication system from the time of capture at the encoder to the time of display at the decoder. A detailed analysis is presented to illustrate the delay problem. We then describe a statistically uniform intra-block refresh scheme for very low delay video communication. By scattering intra-blocks uniformly into continuous frames, the overall delay is significantly decreased, and object changes in the scene could be presented to the end user instantly. For comparison, the overall delay and the peak signal-to-noise ratio (PSNR) performance are tested. The experiment results show that an average of approximately 0.1 dB PSNR gain on average is obtained relative to random intra-macroblock refresh algorithm in H.264 JM, and the end-to-end delay performance is significantly improved.

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