用于完全可伸缩视频编码的运动域的分层锚定

Dominic Rüfenacht, R. Mathew, D. Taubman
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引用次数: 9

摘要

传统的视频编解码器将运动域锚定在要预测的帧中,这在不可伸缩的上下文中是很自然的。在本文中,我们提出了在参考帧上对运动场进行分层锚定,这允许在更精细的时间级别上“重用”它们——这是时间可扩展性的一个非常理想的特性。使用这种方法的主要挑战是运动场需要被扭曲到目标帧,导致扭曲的运动场中的解咬合和运动折叠。我们展示了如何通过使用最近提出的可扩展运动编码的断点字段来解决在移动对象边界附近发生的运动折叠歧义。在运动场扭曲过程中,我们实时获得消光和折叠映射,用于控制Haar小波的时间更新步长。综合数据的结果表明,所提出的分层锚定方案优于传统的运动场锚定方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hierarchical anchoring of motion fields for fully scalable video coding
Traditional video codecs anchor motion fields in the frame that is to be predicted, which is natural in a non-scalable context. In this paper, we propose a hierarchical anchoring of motion fields at reference frames, which allows to “reuse” them at finer temporal levels - a very desirable property for temporal scalability. The main challenge using this approach is that the motion fields need to be warped to the target frames, leading to disocclusions and motion folding in the warped motion fields. We show how to resolve motion folding ambiguities that occur in the vicinity of moving object boundaries by using breakpoint fields that have recently been proposed for the scalable coding of motion. During the motion field warping process, we obtain disocclusion and folding maps on-the-fly, which are used to control the temporal update step of the Haar wavelet. Results on synthetic data show that the proposed hierarchical anchoring scheme outperforms the traditional way of anchoring motion fields.
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