Mesh-based motion models for wavelet video coding
Mesh-based motion models for wavelet video coding
复制标题
用于小波视频编码的基于网格的运动模型
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
J. Konrad
中科院分区：
文献类型：
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作者：
N. Bozinovic;J. Konrad
离散小波变换，实现使用提升沿着运动轨迹，是有效的和高效的时间分解工具，促进视频压缩与当前标准的竞争。然而，如最近所示，为了使基于提升的运动补偿小波变换等效于其横向（标准）实现，运动变换必须是可逆的，并且帧之间的运动组成必须是明确定义的。在本文中，我们讨论了各种基于网格的运动模型，满足可逆性和组成的要求，从而适用于运动补偿提升小波变换。我们提出了一种新的网格配置，保留了网格结构的规律性，但提供了更好的运动补偿相比，以前报道的网格拓扑结构，特别是在图像边界附近。我们的研究结果表明，在运动补偿和整体压缩性能的改善是可能的，只有运动开销比特率的分数增加。
Discrete wavelet transforms, implemented using lifting along motion trajectories, are effective and efficient temporal decomposition tools that facilitate video compression competitive with the current standards. As recently shown, however, in order that a lifting-based motion-compensated wavelet transform be equivalent to its transversal (standard) implementation, motion transformation must be invertible and motion composition between frames must be well-defined. In this paper, we discuss various mesh-based motion models that satisfy requirements of invertibility and composition, and thus are suitable for use in motion-compensated lifting-based wavelet transforms. We propose a new mesh configuration that preserves regularity of the mesh structure but provides better motion compensation compared to previously-reported mesh topologies, particularly in the proximity of image boundaries. Our results show that an improvement in motion compensation and overall compression performance is possible with only a fractional increase in motion overhead bit-rate.