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arXiv 2106.02634cs.CVcs.AIcs.GRcs.LGcs.MM
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光场网络:具有单一评估渲染的神经场景表示

Light Field Networks: Neural Scene Representations with Single-Evaluation Rendering

MIT CSAIL(麻省理工学院计算机科学与人工智能实验室);Columbia University(哥伦比亚大学);IAFI;MIT BCS(麻省理工学院脑与认知科学系);CBMM

Vincent Sitzmann, Semon Rezchikov, William T. Freeman, Joshua B. Tenenbaum, Fredo Durand

摘要:

从二维观测数据推断三维场景的表示是计算机图形学、计算机视觉和人工智能的基本问题。新兴的三维结构神经场景表示是一种很有前途的三维场景理解方法。在这项工作中,我们提出了一种新的神经场景表示,光场网络或LFNs,它表示通过神经隐式表示参数化的360度四维光场中的基础3D场景的几何形状和外观。渲染来自LFN的光线仅需要单个网络评估,而不是3D结构神经场景表示中的光线行进或基于体积的渲染器的每根光线的数百个评估。在简单场景的设置中,我们利用元学习来学习LFN的先验知识,该先验知识可以从单个图像观察中实现多视图一致的光场重建。这将大大减少时间和内存复杂性,并实现实时渲染。通过LFN存储360度光场的成本比Lumigraph等传统方法低两个数量级。利用神经隐式表示的解析可微性和一种新颖的光空间参数化,我们进一步证明了从LFNs中提取稀疏深度图。

英文摘要:

Inferring representations of 3D scenes from 2D observations is a fundamental problem of computer graphics, computer vision, and artificial intelligence. Emerging 3D-structured neural scene representations are a promising approach to 3D scene understanding. In this work, we propose a novel neural scene representation, Light Field Networks or LFNs, which represent both geometry and appearance of the underlying 3D scene in a 360-degree, four-dimensional light field parameterized via a neural implicit representation. Rendering a ray from an LFN requires only a single network evaluation, as opposed to hundreds of evaluations per ray for ray-marching or volumetric based renderers in 3D-structured neural scene representations. In the setting of simple scenes, we leverage meta-learning to learn a prior over LFNs that enables multi-view consistent light field reconstruction from as little as a single image observation. This results in dramatic reductions in time and memory complexity, and enables real-time rendering. The cost of storing a 360-degree light field via an LFN is two orders of magnitude lower than conventional methods such as the Lumigraph. Utilizing the analytical differentiability of neural implicit representations and a novel parameterization of light space, we further demonstrate the extraction of sparse depth maps from LFNs.

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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