An effective CU size decision method for quality scalability in SHVC

An effective CU size decision method for quality scalability in SHVC
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SHVC 中质量可扩展性的有效 CU 大小决策方法

DOI:
10.1007/s11042-016-3460-9
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发表时间:
2017-03
期刊:
Multimed Tools and Applications
影响因子:
--
通讯作者:
Moncef Gabbouj
Moncef Gabbouj
中科院分区:
其他
文献类型:
--
作者:
Xiaoni Li;Mianshu Chen;Zhaowei Qu;Jimin Xiao;Moncef Gabbouj

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高效视频编码的可伸缩扩展(称为SHVC)将高压缩效率与在单个比特流中对相同编码视频的不同分辨率进行编码的可能性相结合。然而,这伴随着高计算复杂度。在本文中,我们提出了一种有效的编码单元(CU)的大小决定方法,通过限制CU的深度范围,以减少编码时间的质量可伸缩性SHVC。由于增强层(enhancement layer,EL)中的最佳深度等级与基础层(base layer,BL)中的最佳深度等级高度相关,因此我们可以根据BL中的共位CU的深度来确定EL中的CU深度范围。基于当前编码单元与其时空相邻编码单元之间的高度相关性,所提出的方法跳过了在先前帧和相邻编码单元中很少使用的一些特定深度级别,以进一步降低计算复杂度。实验结果表明,该方法可以有效地降低计算复杂度,同时保持类似的率失真(RD)性能的原始SHVC编码器。
The Scalable extension of the High Efficiency Video Coding (known as SHVC) combines the high compression efficiency with the possibility of encoding different resolutions of the same encoded video in a single bitstream. However, this is accompanied with a high computational complexity. In this paper, we propose an effective coding unit (CU) size decision method by restricting the CU depth range to reduce the encoding time for quality scalability in SHVC. Since the optimal depth level in the enhancement layer (EL) is highly correlated to that in the base layer (BL), we can determine the CU depth range in the EL according to the depth of the co-located CU in the BL. Based on the high correlation between the current CU and its spatio-temporal neighboring CUs, the proposed method skips some specific depth levels which are rarely used in the previous frame and neighboring CUs to further reduce the computational complexity. Experimental results demonstrate that the proposed method can efficiently reduce computational complexity while maintaining similar rate distortion (RD) performance as the original SHVC encoder.
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