Neural radiance fields (NeRFs) show potential for transforming images captured worldwide into immersive 3D visual experiences. However, most of this captured visual data remains siloed in our camera rolls as these images contain personal details. Even if made public, the problem of learning 3D representations of billions of scenes captured daily in a centralized manner is computationally intractable. Our approach, DecentNeRF, is the first attempt at decentralized, crowd-sourced NeRFs that require $\sim 10^4\times$ less server computing for a scene than a centralized approach. Instead of sending the raw data, our approach requires users to send a 3D representation, distributing the high computation cost of training centralized NeRFs between the users. It learns photorealistic scene representations by decomposing users' 3D views into personal and global NeRFs and a novel optimally weighted aggregation of only the latter. We validate the advantage of our approach to learn NeRFs with photorealism and minimal server computation cost on structured synthetic and real-world photo tourism datasets. We further analyze how secure aggregation of global NeRFs in DecentNeRF minimizes the undesired reconstruction of personal content by the server.

DecentNeRF是第一次尝试的去中心化、众包的神经辐射场（NeRFs），与集中式方法相比，它在训练过程中减少了服务器计算成本，并通过将用户的3D视图分解为个人和全局NeRFs以及一种新颖的最优加权聚合，实现学习具有照片级真实感的场景表示。它在结构化合成和真实世界照片旅游数据集上验证了我们的方法学习NeRFs具有照片级真实感和最小的服务器计算成本，并进一步分析了DecentNeRF中全局NeRFs的安全聚合如何最小化服务器对个人内容的不良重建。

分布式神经辐射场模型: 基于众包图像的去中心化实现