Largest coding unit based framework for non-local means filter
Largest coding unit based framework for non-local means filter
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发表时间：
2012-12
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通讯作者：
Masaaki Matsumura;Seishi Takamura;A. Shimizu
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作者：
Masaaki Matsumura;Seishi Takamura;A. Shimizu
低延迟的编解码能力是视频编解码器在环滤波的重要因素之一。本文将采样自适应偏移量和自适应环路滤波器之间的非局部均值滤波应用于高效视频编码HM7.0参考软件中，提出了一种基于最大编码单位(LCU)的非局部均值滤波框架，能够在编解码端按最大编码单位(LCU)的顺序重建解码图像。结果表明，与HM7.0锚相比，在基于图片的RD优化的情况下，亮度和色度的平均BD率分别提高了0.36%到1.52%和0.04%到1.37%。同样，基于LCU的One分别提高了0.20%到1.27%和0.67%到1.91%。确定了低延时P上“和服”序列的最大增益，分别为3.50%(Y)、2.89%(U)和1.84%(V)。主观质量的改善也被观察到。
One of the important factors for in-loop filter of video codec is low-delay capability for encoding and decoding. In this paper, we employ non-local means filter between sample adaptive offset and adaptive loop filter to the reference software of High Efficiency Video Coding HM7.0, and propose largest coding unit (LCU) based framework for non-local means filter that can reconstruct a decoded picture in LCU order at encoder and decoder. As the result, compared to HM7.0 anchor, in the case of picture-based RD-optimization, the average improvements of BD-rate for luma and chroma are 0.36 to 1.52% and 0.04 to 1.37%, respectively. Similarly, LCU-based one improves 0.20 to 1.27% and 0.67 to 1.91%, respectively. We confirm the maximum gain in the sequence of “Kimono” on low-delay P; the gains are 3.50% (Y), 2.89% (U) and 1.84% (V), respectively. Subjective quality improvements are also observed.