Virtual reality 360° video has an ultra-high resolution (usually 4–8 K), which takes more coding time than traditional video. Considering the degree of horizontal stretching in a different area of the ERP projected video, a fast coding unit (CU) partition algorithm based on the sum of region-directional dispersion is proposed. The relationship between the current block and its adjacent ones is measured based on the degree of horizontal stretching, and the current frame is divided into three regions. A new metric named the Sum of Region-directional Dispersion is defined to measure the complexity of the current block in different regions and directions. In the proposed algorithm, the optimal fast partition threshold is determined for each region to achieve the goal of early termination partition. Compared with the original reference software HM16.20, the proposed algorithm can reduce the time in virtual reality video coding by 38.5%, while the BD-rate only increases by 0.40%.

中文翻译：

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一种基于区域方向色散总和的虚拟现实360°视频快速CU划分算法

虚拟现实360°视频具有超高分辨率（通常为4-8K），比传统视频需要更多的编码时间。考虑到ERP投影视频不同区域的水平拉伸程度，提出了一种基于区域方向色散总和的快速编码单元(CU)划分算法。根据水平拉伸的程度来衡量当前块与其相邻块的关系，将当前帧分为三个区域。定义了一个名为 Sum of Region-directional Dispersion 的新指标来衡量当前块在不同区域和方向上的复杂度。该算法针对每个区域确定最优的快速分区阈值，以达到提前终止分区的目的。与原参考软件HM16.20相比，