Temporal Prediction Model-Based Fast Inter CU Partition for Versatile Video Coding.

Temporal Prediction Model-Based Fast Inter CU Partition for Versatile Video Coding.
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DOI:
10.3390/s22207741
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发表时间:
2022-10-12
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Zhu Y
Zhu Y
中科院分区:
其他
文献类型:
--
作者:
Li Y;Luo F;Zhu Y

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通用视频编码(Versatile Video Coding,VVC)采用先进的四叉树加多类型树(Quad-tree plus Multi-Type Tree,QTMT)编码结构,以获得更高的压缩效率,但其代价是编码复杂度大大增加。为了有效降低基于QTMT的编码单元(CU)划分的编码复杂度,提出了一种基于时间预测模型的快速CU间划分方法,包括提前终止QTMT划分和提前跳过多类型树(MT)划分。首先,根据当前编码单元的位置,提取出与先前编码帧对应位置的最优编码单元划分信息。然后,我们建立一个基于时间CU分区信息的时间预测模型来预测当前CU分区。最后,为了减少时间预测模型的累积误差,我们进一步提取CU的运动矢量差(MVD)来确定QTMT分区是否可以提前终止。实验结果表明,在随机接入(RA)配置下,该方法可使VVC帧间编码复杂度平均降低23.19%,而Bjontegaard delta比特率(BDBR)平均仅提高0.97%。
Versatile video coding (VVC) adopts an advanced quad-tree plus multi-type tree (QTMT) coding structure to obtain higher compression efficiency, but it comes at the cost of a considerable increase in coding complexity. To effectively reduce the coding complexity of the QTMT-based coding unit (CU) partition, we propose a fast inter CU partition method based on a temporal prediction model, which includes early termination QTMT partition and early skipping multi-type tree (MT) partition. Firstly, according to the position of the current CU, we extract the optimal CU partition information of the position corresponding to the previously coded frames. We then establish a temporal prediction model based on temporal CU partition information to predict the current CU partition. Finally, to reduce the cumulative of errors of the temporal prediction model, we further extract the motion vector difference (MVD) of the CU to determine whether the QTMT partition can be terminated early. The experimental results show that the proposed method can reduce the inter coding complexity of VVC by 23.19% on average, while the Bjontegaard delta bit rate (BDBR) is only increased by 0.97% on average under the Random Access (RA) configuration.
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