HDR-NSFF: High Dynamic Range Neural Scene Flow Fields

Radiance of real-world scenes typically spans a much wider dynamic range than what standard cameras can capture, often leading to saturated highlights or underexposed shadows. While conventional HDR methods merge alternatively exposed frames, most approaches remain constrained to the 2D image plane, failing to model geometry and motion consistently. To address these limitations, we present HDR-NSFF, a novel framework for reconstructing dynamic HDR radiance fields from alternatively exposed monocular videos. Our method explicitly models 3D scene flow, HDR radiance, and tone mapping in a unified end-to-end pipeline. We further enhance robustness by (i) extending semantic-based optical flow with DINO features to achieve exposure-invariant motion estimation, and (ii) incorporating a generative prior as a regularizer to compensate for sparse-view and saturation-induced information loss. To enable systematic evaluation, we construct a real-world GoPro dataset with synchronized multi-exposure captures. Experiments demonstrate that HDR-NSFF achieves state-of-the-art performance in novel view and time synthesis, recovering fine radiance details and coherent dynamics even under challenging exposure variations and large motions.