Flexible Mode Selection and Complexity Allocation in High Efficiency Video Coding
Flexible Mode Selection and Complexity Allocation in High Efficiency Video Coding
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DOI：
10.1109/jstsp.2013.2271421
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发表时间：
2013-06
影响因子：
7.5
通讯作者：
Tiesong Zhao;Zhou Wang;S. Kwong
中科院分区：
文献类型：
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作者：
Tiesong Zhao;Zhou Wang;S. Kwong
为了提高压缩性能，高效视频编码（HEVC）采用基于四叉树的块表示，即编码树单元（CTU），与传统宏块相比，它可以支持更大的分区和更多的编码模式。尽管压缩效率很高，但编码模式的组合数量急剧增加，这导致编码器的计算复杂度很高。在这里，我们提出了一个灵活的 HEVC 编码模式选择框架，具有用户定义的全局复杂度因子。基于线性规划，开发了分层复杂性分配方案，以在帧和编码单元（CU）之间分配计算复杂性，以最大化整体率失真（RD）性能。在每个CU中，利用分配的复杂度因子，采用基于模式映射的方法来进行编码模式选择。大量的实验表明，在一系列全局复杂性因素的影响下，所提出的模型可以在计算复杂性和RD性能之间实现良好的权衡。
To improve compression performance, High Efficiency Video Coding (HEVC) employs a quad-tree based block representation, namely Coding Tree Unit (CTU), which can support larger partitions and more coding modes than a traditional macroblock. Despite its high compression efficiency, the number of combinations of coding modes increases dramatically, which results in high computational complexity at the encoder. Here we propose a flexible framework for HEVC coding mode selection, with a user-defined global complexity factor. Based on linear programming, a hierarchical complexity allocation scheme is developed to allocate computational complexities among frames and Coding Units (CUs) to maximize the overall Rate-Distortion (RD) performance. In each CU, with the allocated complexity factor, a mode mapping based approach is employed for coding mode selection. Extensive experiments demonstrate that, with a series of global complexity factors, the proposed model can achieve good trade-offs between computational complexity and RD performance.