自适应分辨率变化的多功能视频编码

Tsui-Shan Chang, Yu-Chen Sun, Ling Zhu, J.-G. Lou
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引用次数: 5

摘要

为了使视频码流传输适应动态网络环境,提出了一种应用于通用视频编码(VVC)的自适应分辨率变化(ARC)方法。这种方法可以在视频序列的任何帧内改变分辨率,而不需要插入即时解码器刷新(IDR)或帧内随机访问图像(IRAP)。其基础技术包括参考图像重采样和处理现有编码工具与分辨率变化之间的相互作用。在VVC中采用的技术基础上,本文提出了时间运动矢量预测和去块滤波两种技术,进一步提高了图像的主客观质量。实验结果表明,该方法可以有效地避免分辨率变化过程中插入帧对码元成本造成的负担。同时,Y、Cb和Cr组分的bd率分别降低了18%、21%和21%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adaptive Resolution Change for Versatile Video Coding
This paper presents an adaptive resolution change (ARC) method adopted in versatile video coding (VVC) to adapt the video bit-stream transmission to dynamic network environments. This approach enables resolution changes within a video sequence at any frame without the insertion of an instantaneous decoder refresh (IDR) or intra random access picture (IRAP). The underlying techniques include reference picture resampling and handling of interactions between the existing coding tools and the changes in resolution. In addition to the techniques adopted in VVC, this paper proposes two techniques for temporal motion vector prediction and deblocking filter to further improve both subjective and objective quality. The experimental results show that the combined ARC method can prevent the burden on bit cost exerted by the insertion of an intra frame during resolution changes. At the same time, 18%, 21% and 21% BD-rate reductions are achieved for Y, Cb, and Cr components, respectively.
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