“DE-NeRF: DEcoupled Neural Radiance Fields for View-Consistent Appearance Editing and High-Frequency Environmental Relighting” by Wu, Sun, Lai and Gao
Conference:
Type(s):
Title:
- DE-NeRF: DEcoupled Neural Radiance Fields for View-Consistent Appearance Editing and High-Frequency Environmental Relighting
Session/Category Title: Environmental Rendering: NeRFs On Earth
Presenter(s)/Author(s):
Moderator(s):
Abstract:
Neural Radiance Fields (NeRF) have shown promising results in novel view synthesis. While achieving state-of-the-art rendering results, NeRF usually encodes all properties related to geometry and appearance of the scene together into several MLP (Multi-Layer Perceptron) networks, which hinders downstream manipulation of geometry, appearance and illumination. Recently researchers made attempts to edit geometry, appearance and lighting for NeRF. However, they fail to render view-consistent results after editing the appearance of the input scene. Moreover, high-frequency environmental relighting is also beyond their capability as lighting is modeled as Spherical Gaussian (SG) and Spherical Harmonic (SH) functions or a low-resolution environment map. To solve the above problems, we propose DE-NeRF to decouple view-independent appearance and view-dependent appearance in the scene with a hybrid lighting representation. Specifically, we first train a signed distance function to reconstruct an explicit mesh for the input scene. Then a decoupled NeRF learns to attach view-independent appearance to the reconstructed mesh by defining learnable disentangled features representing geometry and view-independent appearance on its vertices. For lighting, we approximate it with an explicit learnable environment map and an implicit lighting network to support both low-frequency and high-frequency relighting. By modifying the view-independent appearance, rendered results are consistent across different viewpoints. Our method also supports high-frequency environmental relighting by replacing the explicit environment map with a novel one and fitting the implicit lighting network to the novel environment map. Experiments show that our method achieves better editing and relighting performance both quantitatively and qualitatively compared to previous methods.
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