DiSR-NeRF: Diffusion-Guided View-Consistent Super-Resolution NeRF

• URL: http://arxiv.org/abs/2404.00874v1
• Date: Mon, 1 Apr 2024 03:06:23 GMT
• Title: DiSR-NeRF: Diffusion-Guided View-Consistent Super-Resolution NeRF
• Authors: Jie Long Lee, Chen Li, Gim Hee Lee,
• Abstract summary: DiSR-NeRF is a diffusion-guided framework for view-consistent super-resolution (SR) NeRF. We propose Iterative 3D Synchronization (I3DS) to mitigate the inconsistency problem via the inherent multi-view consistency property of NeRF.
• Score: 50.458896463542494
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present DiSR-NeRF, a diffusion-guided framework for view-consistent super-resolution (SR) NeRF. Unlike prior works, we circumvent the requirement for high-resolution (HR) reference images by leveraging existing powerful 2D super-resolution models. Nonetheless, independent SR 2D images are often inconsistent across different views. We thus propose Iterative 3D Synchronization (I3DS) to mitigate the inconsistency problem via the inherent multi-view consistency property of NeRF. Specifically, our I3DS alternates between upscaling low-resolution (LR) rendered images with diffusion models, and updating the underlying 3D representation with standard NeRF training. We further introduce Renoised Score Distillation (RSD), a novel score-distillation objective for 2D image resolution. Our RSD combines features from ancestral sampling and Score Distillation Sampling (SDS) to generate sharp images that are also LR-consistent. Qualitative and quantitative results on both synthetic and real-world datasets demonstrate that our DiSR-NeRF can achieve better results on NeRF super-resolution compared with existing works. Code and video results available at the project website.

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