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An Optimized Rate Control Algorithm in Versatile Video Coding for 360° Videos
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DOI：10.1109/LSP.2022.3219359.png)
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Abstract
En 中文
Today, 360 degrees video has become an integral part of people's lives. Despite the fact that the latest generation standard Versatile Video Coding (VVC) demonstrates a significant gain in encoding capacity over High Efficiency Video Coding (HEVC), it still has room for 360 degrees video encoding improvements. To further enhance the applicability of 360 degrees video coding, an optimized rate control (RC) algorithm in VVC for 360 degrees video is proposed in this paper. We present an efficient extraction algorithm for obtaining the video's saliency feature. Furthermore, for the characteristics of 360 degrees video, a partitioning algorithm is also proposed to divide a frame into demand and non-demand regions. Additionally, to achieve precise and rational RC, a Coding Tree Unit (CTU)-level bit allocation strategy is proposed based on the saliency feature for the above-mentioned regions. The experimental results show that the proposed RC algorithm can achieve 11.77% bitrate savings and more accurate allocation compared with the default algorithm of VVC. Also, performance enhancement has been observed in comparison to the most advanced algorithm.
Keywords:
360 degrees video
partitioning algorithm
rate control
saliency feature
versatile video coding
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