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Signal, Image and Video Processing

, Volume 13, Issue 1, pp 17–25 | Cite as

Rate control for HEVC intra-coding with a CTU-dependent distortion model

  • Wei LiEmail author
  • Peng Ren
  • Erhu Zhang
  • Fan Zhao
Original Paper
  • 62 Downloads

Abstract

Rate control is used to regulate the coded bits for valid video storage or transmissions. For the novel high-efficiency video coding (HEVC) encoder, a new the Rλ-based rate control model is incorporated to further make a trade-off between video quality and bandwidth utilization. However, the intra-coding distortion, which is drifted from the coding tree units (CTUs) to subsequent CTUs and thus affects the performance of rate control, is not fully considered in Rλ model. To address this issue, an intra-CTU rate control scheme is developed in this paper for further improving the visual quality. First the 35 intra-modes are segmented into 5 categories, and then the distortion drift of each category is studied in terms of intra-prediction principle. Afterwards the SAD-based distortion formulation is derived and utilized into Rλ model. Finally, the modified Rλ model is added in HEVC rate control for quantization calculation. The experimental results show that the proposed method significantly increases the encoding performance while well accepting computational complexity.

Keywords

Rate control Distortion drift SATD HEVC 

Notes

Acknowledgements

This work was supported by Project funded by China Postdoctoral Science Foundation (2017M610644) and the National Science Foundation of China (61671376, 61671374).

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Digital Media TechnologyXi’an University of TechnologyXi’anChina
  2. 2.School of Telecommunication EngineeringXidian UniversityXi’anChina

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