空表面的重建技术综述

A Survey of Space-time Surface Reconstruction

时空表面表示了随时间变化(运动或非刚性变形)的动态对象(如人体、布料等),具有显著的科学意义和应用前景,可直接应用到动画和影视制作、虚拟现实和机器人控制等领域。随着扫描技术的发展,逆向数字化重建时空表面成为可能。但由于遮挡问题,获取的有噪声的局部模型持久性地缺失数据(具有空洞甚至间隙);而且时空表面固有的时空对应性问题更决定了其重建的挑战性。概述了其原理、属性和应用,分析了时空表面重建所包含的许多十分困难的且常常为病态的问题,系统地介绍了这一领域的工作成果并进行了分类,分析了各方面典型算法的优缺点,最后展望了这一技术的发展前景。

Space-time surface continuously describes and represents the dynamic objects in the real world, such as body and cloth, which temporally change their shapes in the motion or non-rigid deformation. The research of time-space surface has important scientific significance, since it could be directly applied in many fields, e.g., computer animation, cinema production, virtual reality and robot management. Recent advanced scanning technologies together with increasing computational power allow the space-time capture of three-dimensional objects as they move and deform. Organizing the data captured by these scanners into a coherent model of a deforming object is a challenging computational problem, since it contains a number of hard and often ill-posed problems. For the input scans, large parts of the surface are occluded in each frame, leading to gaping holes that often persist across many frames, more important, it is difficult how to process the temporal and spatial correspondences of large number of (noisy) scanned geometric information. In this paper, the theory, properties, and application of space-time surface reconstruction are addressed, the recent advantages are detailed and classified, typical methods are analyzed, and the outlook of the future work is given at the end.