SPC: Fast and Efficient Scalable Predictive Coding of Animated Meshes
SPC: Fast and Efficient Scalable Predictive Coding of Animated Meshes
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DOI：
10.1111/j.1467-8659.2009.01547.x
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发表时间：
2010-03
影响因子：
2.5
通讯作者：
N. Stefanoski;J. Ostermann
中科院分区：
文献类型：
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作者：
N. Stefanoski;J. Ostermann
动画网格通常由一系列具有恒定连通性的静态网格表示。由于它们基于帧的表示形式，通常会占用大量带宽或磁盘空间。我们提出了一种快速高效的可扩展预测编码（SPC）方案，用于动画网格的基于帧的表示。SPC将动画网格分解为空间层和时间层，在对动画进行一次遍历的过程中对这些层进行高效编码。编码以一种可流式传输和可扩展的方式进行。利用已编码的时空邻域对相邻空间层和时间层之间的相关性进行预测性挖掘。在旋转不变坐标空间中进行预测，以补偿局部刚性运动。SPC支持空间和时间可扩展性，并且能够实现高效压缩以及快速编码和解码。SPC的部分内容被采用到MPEG - 4 FAMC标准中。然而，SPC的性能明显优于FAMC的流模式，编码增益超过33%，而与可扩展的FAMC相比，SPC实现的编码增益高达15%。与FAMC相比，SPC具有额外的优势，即能够实现实时编码和解码速率，同时对内存的要求较低。与其他一些不可扩展的现有先进方法相比，SPC在比特率方面表现出卓越的压缩性能，增益超过16%。
Animated meshes are often represented by a sequence of static meshes with constant connectivity. Due to their frame‐based representation they usually occupy a vast amount of bandwidth or disk space. We present a fast and efficient scalable predictive coding (SPC) scheme for frame‐based representations of animated meshes. SPC decomposes animated meshes in spatial and temporal layers which are efficiently encoded in one pass through the animation. Coding is performed in a streamable and scalable fashion. Dependencies between neighbouring spatial and temporal layers are predictively exploited using the already encoded spatio‐temporal neighbourhood. Prediction is performed in the space of rotation‐invariant coordinates compensating local rigid motion. SPC supports spatial and temporal scalability, and it enables efficient compression as well as fast encoding and decoding. Parts of SPC were adopted in the MPEG‐4 FAMC standard. However, SPC significantly outperforms the streaming mode of FAMC with coding gains of over 33%, while in comparison to the scalable FAMC, SPC achieves coding gains of up to 15%. SPC has the additional advantage over FAMC of achieving real‐time encoding and decoding rates while having only low memory requirements. Compared to some other non‐scalable state‐of‐the‐art approaches, SPC shows superior compression performance with gains of over 16% in bit‐rate.