MPS-NeRF: Generalizable 3D Human Rendering from Multiview Images (TPAMI 2022)

This repository contains the official PyTorch implementation of the TPAMI 2022 paper:

MPS-NeRF: Generalizable 3D Human Rendering from Multiview Images
Xiangjun Gao, Jiaolong Yang, Jongyoo Kim, Sida Peng, Zicheng Liu, and Xin Tong
Paper | Project website | Video

Abstract — There has been rapid progress recently on 3D human rendering, including novel view synthesis and pose animation, based on the advances of neural radiance fields (NeRF). However, most existing methods focus on person-specific training and their training typically requires multi-view videos. This paper deals with a new challenging task – rendering novel views and novel poses for a person unseen in training, using only multiview still images as input without videos. For this task, we propose a simple yet surprisingly effective method to train a generalizable NeRF with multiview images as conditional input. The key ingredient is a dedicated representation combining a canonical NeRF and a volume deformation scheme. Using a canonical space enables our method to learn shared properties of human and easily generalize to different people. Volume deformation is used to connect the canonical space with input and target images and query image features for radiance and density prediction. We leverage the parametric 3D human model fitted on the input images to derive the deformation, which works quite well in practice when combined with our canonical NeRF. The experiments on both real and synthetic data with the novel view synthesis and pose animation tasks collectively demonstrate the efficacy of our method.

Installation

• The code has been tested with python 3.7 + CUDA 11.1. + torch 1.8.1 on Ubuntu 18.04

• In the folder of this repository, run the following commands to install dependencies:

  pip install -r requirements.txt

• Install the Pytorch3D package (guidance from here).

Set up Dataset

THuman Dataset

For generalizable NeRF training, we render multi-view images from THuman dataset, which is a 3D Human Dataset with both geometry and texture.

THuman dataset is released in DeepHuman by TsingHua University. We are not allowed to publish or distribute the dataset in any form to any third party without Tsinghua University’s prior written permission.

If you want to use the rendered images from THuman dataset, you may check this download Instruction of THuman dataset. Please fill in the application form and get permission from Prof. Yebin Liu' Group. Then you may send me(xiangjun_gao@outlook.com) an email with the agreement as an attachment or just forward their reply email to me. I will share with you the download link of our Thuman training set rendered from the THuman dataset.

Human3.6M dataset

Since the license of Human3.6M dataset does not allow us to distribute its data and the dataset is further processed by animatable_nerf, we cannot release the Human3.6M dataset publicly. please refer to this page to get access to Human3.6M dataset.

cd data
ln -s /path/to/THuman THuman
ln -s /path/to/h36m h36m

Train MPS-NeRF

Training demo with THuman dataset

CUDA_VISIBLE_DEVICES=0,1 python3 run_nerf_batch.py --config configs/canonical_transformer.txt --view_num 3 --data_root  ./data/THuman/nerf_data_/results_gyx_20181013_hyd_1_M --expname THuman_3_view

Training demo with H36M dataset

For S1

CUDA_VISIBLE_DEVICES=0,1  python3 run_nerf_batch.py --config configs/h36m.txt --view_num 3 --test_persons 0 --data_root ./data/h36m/S1/Posing --expname H36M_S1

For S5

CUDA_VISIBLE_DEVICES=0,1  python3 run_nerf_batch.py --config configs/h36m.txt --view_num 3 --test_persons 1 --data_root ./data/h36m/S5/Posing --expname H36M_S5

The training will start! The evaluation will be done automatically once the training is finished.

The code will save the loss curves and evaluation results under logs/expname.

The SMPL body related files (including all .pkl files under the assets/ folder) are subject to the license of the SMPL model. You should download the smpl basic model from this link and move it to the assets/ folder.

Extract and Repose Human 3D Shape

To extract and repose the 3D shape using the density field from sparse input views, you may run the following command.

python3 extract_thuman_mesh.py --config configs/canonical_transformer.txt --view_num 3 --expname THuman_3_view --use_os_env 1

To render the normal map of extracted mesh,

python3 render_thuman_mesh.py --config configs/canonical_transformer.txt --view_num 3 --expname THuman_3_view

Citations

If you find the codes of this work or the associated ReSynth dataset helpful to your research, please consider citing:

@ARTICLE{9888037,
  author={Gao, Xiangjun and Yang, Jiaolong and Kim, Jongyoo and Peng, Sida and Liu, Zicheng and Tong, Xin},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence}, 
  title={MPS-NeRF: Generalizable 3D Human Rendering From Multiview Images}, 
  year={2022},
  volume={},
  number={},
  pages={1-12},
  doi={10.1109/TPAMI.2022.3205910}}

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