结合视频内容的AV1快速块划分决策

Fast Coding Block Partition Decision for AV1 Combining Video Content

针对AOMedia Video 1(AV1)编码时间较长的问题,基于不同纹理的视频内容与分区模式之间的联系,引入了虚拟子块的跨块梯度差来衡量图像纹理分布的差异,提出了一种快速块划分决策算法,以跳过非必要的分区模式。利用分区终止块大小与性能损失之间的联系,根据当前块大小自适应调整快速块划分的判断阈值,使得较小的编码块具有较宽松的跳过条件。与libaom相比,该算法在全帧内(All-Intra,AI)配置下平均可节省16.15%的编码时间,同时性能损失较小,有望被用于减少高分辨率视频的编码时间。

To solve the problem of long encoding time of AOMedia Video 1(AV1),based on the connection between video content with different textures and partition modes,we propose a method that utilizes the cross-block gradient difference of virtual sub-blocks to measure the difference in image texture distribution.And a fast coding block partition decision to skip unnecessary partition modes is proposed.Besides,the connection between the partition termination block size and the increment of performance loss has been considered.The threshold for fast coding block partition decision can be adjusted adaptively according to the current block size,with smaller blocks having relatively loose judgment conditions.Compared with libaom,the proposed method can achieve an average encoding time saving of 16.15%in All-Intra(AI)configuration,without a significant loss in compression performance.It is expected to be applied to reduce the encoding time of high-resolution video.