Bayes' Rays: Uncertainty Quantification for Neural Radiance Fields
Authors: name: Lily Goli, name: Cody Reading, name: Silvia Selllán, name: Alec Jacobson, name: Andrea Tagliasacchi

Neural Radiance Fields (NeRFs) have shown promise in applications like view
synthesis and depth estimation, but learning from multiview images faces
inherent uncertainties. Current methods to quantify them are either heuristic
or computationally demanding. We introduce BayesRays, a post-hoc framework to
evaluate uncertainty in any pre-trained NeRF without modifying the training
process. Our method establishes a volumetric uncertainty field using spatial
perturbations and a Bayesian Laplace approximation. We derive our algorithm
statistically and show its superior performance in key metrics and
applications. Additional results available at: https://bayesrays.github.io.