Taming Latent Diffusion Model for Neural Radiance Field Inpainting
Authors: name: Chieh Hubert Lin, name: Changil Kim, name: Jia-Bin Huang, name: Qinbo Li, name: Chih-Yao Ma, name: Johannes Kopf, name: Ming-Hsuan Yang, name: Hung-Yu Tseng

Neural Radiance Field (NeRF) is a representation for 3D reconstruction from
multi-view images. Despite some recent work showing preliminary success in
editing a reconstructed NeRF with diffusion prior, they remain struggling to
synthesize reasonable geometry in completely uncovered regions. One major
reason is the high diversity of synthetic contents from the diffusion model,
which hinders the radiance field from converging to a crisp and deterministic
geometry. Moreover, applying latent diffusion models on real data often yields
a textural shift incoherent to the image condition due to auto-encoding errors.
These two problems are further reinforced with the use of pixel-distance
losses. To address these issues, we propose tempering the diffusion model's
stochasticity with per-scene customization and mitigating the textural shift
with masked adversarial training. During the analyses, we also found the
commonly used pixel and perceptual losses are harmful in the NeRF inpainting
task. Through rigorous experiments, our framework yields state-of-the-art NeRF
inpainting results on various real-world scenes. Project page:
https://hubert0527.github.io/MALD-NeRF