CF-NeRF

Project Page | Paper

This repository contains the code release for our ECCV paper: Conditional-Flow NeRF: Accurate 3D Modelling with Reliable Uncertainty Quantification. This implementation is written in Pytorch.

Abstract

A critical limitation of current methods based on Neural Radiance Fields (NeRF) is that they are unable to quantify the uncertainty associated with the learned appearance and geometry of the scene. This information is paramount in real applications such as medical diagnosis or autonomous driving where, to reduce potentially catastrophic failures, the confidence on the model outputs must be included into the decision-making process. In this context, we introduce Conditional-Flow NeRF (CF-NeRF), a novel probabilistic framework to incorporate uncertainty quantification into NeRF-based approaches. For this purpose, our method learns a distribution over all possible radiance fields modelling which is used to quantify the uncertainty associated with the modelled scene. In contrast to previous approaches enforcing strong constraints over the radiance field distribution, CF-NeRF learns it in a flexible and fully data-driven manner by coupling Latent Variable Modelling and Conditional Normalizing Flows. This strategy allows to obtain reliable uncertainty estimation while preserving model expressivity. Compared to previous state-of-the-art methods proposed for uncertainty quantification in NeRF, our experiments show that the proposed method achieves significantly lower prediction errors and more reliable uncertainty values for synthetic novel view and depth-map estimation.

Installation

We recommend using Anaconda to set up the environment. Run the following commands:

conda env create -f environment.yml
conda activate cf_nerf
git clone https://github.com/poetrywanderer/CF-NeRF.git
cd CF-NeRF

Data

Download the LF datasets(official) or LF (used in the paper), LLFF datasets.

Your Own data

To play with other scenes, place your data according to the following directory structure:

├── configs                                                                                                       
│   ├── ...                                                                                     
│                                                                                               
├── data                                                                                                                                                                                                       
│   ├── nerf_llff_data                                                                                                  
│   │   └── fern                                                                                                                             
│   │   └── flower  # downloaded llff dataset                                                                                   
|   |   └── ...
│   ├── lf_data  
│   │   └── basket   # downloaded lf dataset
|   |   └── ...

Training and Testing

To train CF-NeRF on different datasets:

bash train_NF.sh # change the content there

Pre-trained Models

We will gradually release the pretrained models so that you can play with.

License

CF-NeRF is MIT-licensed. The license applies to the pre-trained models as well.

Citation

Please cite as:

@misc{CF-NeRF,
    title = {Conditional-Flow NeRF: Accurate 3D Modelling with Reliable Uncertainty Quantification},
    author = {Shen, Jianxiong and Agudo, Antonio and Moreno-Noguer, Francesc and Ruiz, Adria},
    year = {2022},
    eprint={2203.10192},
    archivePrefix={arXiv},
    primaryClass={cs.CV}
}

Acknowledgement

This inplementation is based on https://github.com/yenchenlin/nerf-pytorch