Low-Complexity Multiple Transform Selection Combining Multi-Type Tree Partition Algorithm for Versatile Video Coding.
Low-Complexity Multiple Transform Selection Combining Multi-Type Tree Partition Algorithm for Versatile Video Coding.
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DOI：
10.3390/s22155523
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发表时间：
2022-07-25
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尽管事实上通用视频编码（VVC）实现了比高效视频编码（HEVC）优越上级的编码性能，但是由于工具的高计算复杂度，其花费大量时间来编码视频序列。在这些工具中，多变换选择（MTS）需要使用率失真优化（RDO）过程获得几个变换中的最佳变换，这增加了视频编码所花费的时间，这意味着VVC不适合实时传感器应用网络。针对上述问题，提出了一种低复杂度的多变换选择算法，并结合多类型树划分算法。首先，为了跳过MTS过程，我们引入了一种基于变换候选的率失真（RD）成本与二进制分裂下子编码单元（sub-CU）的信息熵之间的相关性之间的关系来估计最后编码单元（CU）的率失真（RD）成本的方法。当子CU的RD成本的总和大于或等于其父CU时，将跳过MTS的RD检查。第二，充分利用相邻编码单元的编码信息，提前终止MTS。实验结果表明，与VVC相比，该方法在时间上减少了26.40%，Bjøontegaard Delta Bitrate（BDBR）提高了0.13%。
Despite the fact that Versatile Video Coding (VVC) achieves a superior coding performance to High-Efficiency Video Coding (HEVC), it takes a lot of time to encode video sequences due to the high computational complexity of the tools. Among these tools, Multiple Transform Selection (MTS) require the best of several transforms to be obtained using the Rate-Distortion Optimization (RDO) process, which increases the time spent video encoding, meaning that VVC is not suited to real-time sensor application networks. In this paper, a low-complexity multiple transform selection, combined with the multi-type tree partition algorithm, is proposed to address the above issue. First, to skip the MTS process, we introduce a method to estimate the Rate-Distortion (RD) cost of the last Coding Unit (CU) based on the relationship between the RD costs of transform candidates and the correlation between Sub-Coding Units’ (sub-CUs’) information entropy under binary splitting. When the sum of the RD costs of sub-CUs is greater than or equal to their parent CU, the RD checking of MTS will be skipped. Second, we make full use of the coding information of neighboring CUs to terminate MTS early. The experimental results show that, compared with the VVC, the proposed method achieves a 26.40% reduction in time, with a 0.13% increase in Bjøontegaard Delta Bitrate (BDBR).
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