A ROI quality adjustable rate control scheme for low bitrate video coding

Authors:
Ling Yang;Li Zhang;Siwei Ma;Debin Zhao
Affiliations:
Graduate University, Chinese Academy of Sciences, Beijing;Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China;Institute of Digital Media, School of Electronic Engineering and Computer Science, Peking University, Beijing, China;Department of Computer Science and Engineering, Harbin Institute of Technology, Harbin, China
Venue:
PCS'09 Proceedings of the 27th conference on Picture Coding Symposium
Year:
2009

Citing 4
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Abstract

This paper proposed a novel Region of Interest (ROI) based rate control algorithm for video communication systems, in which the subjective quality of ROI can be adjusted according to users' requirements. In the proposed scheme, in order to analyze the relationship between subjective quality and encoding parameters, a Structural Similarity Index Map - quantization parameter (SSIM-QP) model is established. Through this relation, the possible visual quality range of ROI is defined according to the range of ROI QP, which is predicted by rate control algorithm. Then, with interest levels being identified within the visual quality range, resources allocated to ROI is determined. Finally, considering both the quality of ROI and the entire frame, resource allocation is slightly adjusted. Experimental results demonstrate that the subjective visual quality of ROI in our proposed scheme can be adjustable improved compared to the existing rate control algorithms.