arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2502.03465cs.CVcs.AIcs.GRcs.MM

简观世界动态

Seeing World Dynamics in a Nutshell

National University of Singapore(新加坡国立大学);Nanyang Technological University(南洋理工大学);Skywork AI(天工 AI)

Qiuhong Shen, Xuanyu Yi, Mingbao Lin, Hanwang Zhang, Shuicheng Yan, Xinchao Wang

AI总结:

针对单目视频的时空一致3D表示问题,提出NutWorld框架,通过STAG表示在单次前向传播中生成带深度与光流正则的动态3D高斯,实现高保真实时重建及下游应用。

摘要:

我们研究如何以空间和时间一致的方式高效表示随手拍摄的单目视频。现有方法主要依赖2D/2.5D技术,将视频视为时空像素集合,由于缺乏时间一致性和显式3D结构,在处理复杂运动、遮挡和几何一致性时存在困难。受单目视频是动态3D世界投影这一观点启发,我们探索通过时空中高斯基元的连续流,以视频固有的3D形式表示视频。本文提出NutWorld,这是一种仅需单次前向传播即可将单目视频高效转换为动态3D高斯表示的新颖框架。其核心是,NutWorld引入结构化时空对齐高斯(STAG)表示,可通过有效的深度和光流正则化实现无需优化的场景建模。大量实验表明,NutWorld实现了高保真视频重建质量,并能实时支持多种下游应用。演示和代码将在https://github.com/Nut-World/NutWorld提供。

英文摘要:

We consider the problem of efficiently representing casually captured monocular videos in a spatially- and temporally-coherent manner. While existing approaches predominantly rely on 2D/2.5D techniques treating videos as collections of spatiotemporal pixels, they struggle with complex motions, occlusions, and geometric consistency due to absence of temporal coherence and explicit 3D structure. Drawing inspiration from monocular video as a projection of the dynamic 3D world, we explore representing videos in their intrinsic 3D form through continuous flows of Gaussian primitives in space-time. In this paper, we propose NutWorld, a novel framework that efficiently transforms monocular videos into dynamic 3D Gaussian representations in a single forward pass. At its core, NutWorld introduces a structured spatial-temporal aligned Gaussian (STAG) representation, enabling optimization-free scene modeling with effective depth and flow regularization. Through comprehensive experiments, we demonstrate that NutWorld achieves high-fidelity video reconstruction quality while enabling various downstream applications in real-time. Demos and code will be available at https://github.com/Nut-World/NutWorld.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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