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Content adaptive interpolation filters based on HEVC framework

机译：基于HEVC框架的内容自适应插值滤波器

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摘要

Motion compensation is the key technique to reduce temporal redundancy in video coding. Interpolation filters are adopted to generate the inter frame prediction for motion compensation with fractional pixel accuracy. In existing video coding standards such as H.264/AVC and HEVC, a set of predefined interpolation filters is adopted in motion compensation. However, predefined interpolation filters cannot adapt to the video content, which may compromise the coding efficiency. In this paper, a content adaptive interpolation scheme is proposed for motion compensation. In the proposed scheme, a set of adaptive interpolation filters is derived for each frame as additional interpolation filters to minimize the inter prediction difference. Rate-distortion optimization is employed to choose between the predefined interpolation filters and the derived adaptive interpolation filters to achieve the best coding performance at the low bit rates. The proposed scheme is implemented into the HM 12.1 software. Experimental results show that the proposed scheme achieves 5.13 percent, 3.42 percent and 4.07 percent bit rate saving on average compared with HEVC under the "low delay P", the "low delay B" and the "random access" configurations respectively. (C) 2018 Elsevier Inc. All rights reserved.
机译：运动补偿是减少视频编码中时间冗余的关键技术。采用插值滤波器来生成帧间预测，以分数像素精度进行运动补偿。在诸如H.264 / AVC和HEVC之类的现有视频编码标准中，在运动补偿中采用了一组预定义的插值滤波器。但是，预定义的插值滤波器不能适应视频内容，这可能会损害编码效率。本文提出了一种内容自适应插值方案，用于运动补偿。在提出的方案中，为每个帧导出一组自适应插值滤波器作为附加的插值滤波器，以最小化帧间预测差异。率失真优化用于在预定义的插值滤波器和派生的自适应插值滤波器之间进行选择，以在低比特率下实现最佳编码性能。提议的方案已在HM 12.1软件中实现。实验结果表明，与HEVC相比，在“低延迟P”，“低延迟B”和“随机访问”下，该方案平均节省了5.13％，3.42％和4.07％的比特率。配置。 （C）2018 Elsevier Inc.保留所有权利。

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