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arXiv 2309.08596cs.CVcs.GRcs.RO
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Robust e-NeRF:非均匀运动下从稀疏且含噪事件中重建NeRF

Robust e-NeRF: NeRF from Sparse & Noisy Events under Non-Uniform Motion

National University of Singapore(新加坡国立大学);NUS Graduate School(新加坡国立大学研究生院)

Weng Fei Low, Gim Hee Lee

AI总结:

提出Robust e-NeRF方法,通过逼真事件生成模型和归一化重建损失,从非均匀运动下的稀疏含噪事件中稳健重建NeRF,克服了对密集低噪事件的依赖并提升了对任意速度和参数的泛化能力。

摘要:

事件相机凭借其独特的工作原理,相比标准相机具有诸多优势:低功耗、低延迟、高时间分辨率和高动态范围。尽管如此,许多下游视觉应用的成功也依赖于高效且有效的场景表示,其中神经辐射场(NeRF)被视为首选方案。事件相机与NeRF的这种前景和潜力启发了近期的研究,开始探索从移动事件相机重建NeRF。然而,这些工作主要在以下方面存在局限:对密集且低噪声事件流的依赖,以及对任意对比度阈值和相机速度分布的泛化能力。在本研究中,我们提出了Robust e-NeRF,这是一种在多种真实世界条件下,特别是针对非均匀运动下产生的稀疏和含噪事件,能够直接且稳健地从移动事件相机重建NeRF的新颖方法。它包含两个关键组件:一个考虑了各种内在参数(例如时间无关、不对称阈值和不应期)和非理想性(例如像素间的阈值变化)的逼真事件生成模型;以及一对互补的归一化重建损失,能够在没有此类先验知识的情况下,有效泛化到任意速度分布和内在参数值。在真实和全新逼真模拟序列上的实验验证了我们的有效性。我们的代码、合成数据集和改进的事件模拟器已公开。

英文摘要:

Event cameras offer many advantages over standard cameras due to their distinctive principle of operation: low power, low latency, high temporal resolution and high dynamic range. Nonetheless, the success of many downstream visual applications also hinges on an efficient and effective scene representation, where Neural Radiance Field (NeRF) is seen as the leading candidate. Such promise and potential of event cameras and NeRF inspired recent works to investigate on the reconstruction of NeRF from moving event cameras. However, these works are mainly limited in terms of the dependence on dense and low-noise event streams, as well as generalization to arbitrary contrast threshold values and camera speed profiles. In this work, we propose Robust e-NeRF, a novel method to directly and robustly reconstruct NeRFs from moving event cameras under various real-world conditions, especially from sparse and noisy events generated under non-uniform motion. It consists of two key components: a realistic event generation model that accounts for various intrinsic parameters (e.g. time-independent, asymmetric threshold and refractory period) and non-idealities (e.g. pixel-to-pixel threshold variation), as well as a complementary pair of normalized reconstruction losses that can effectively generalize to arbitrary speed profiles and intrinsic parameter values without such prior knowledge. Experiments on real and novel realistically simulated sequences verify our effectiveness. Our code, synthetic dataset and improved event simulator are public.

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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