Ref-NPR: Reference-Based Non-Photorealistic Radiance Fields for Controllable Scene Stylization (CVPR2023)

This is the official implementation of the Ref-NPR paper

• Ref-NPR: Reference-Based Non-Photorealistic Radiance Fields for Controllable Scene Stylization
  Yuechen Zhang, Zexin He, Jinbo Xing, Xufeng Yao, Jiaya Jia
  IEEE Conference on Computer Vision and Pattern Recognition (CVPR) 2023
  [ arXiv ] [ Project Page ] [ BibTeX ] [ Video ] [ Data ]

Ref-NPR is a powerful tool for single-image scene stylization, allowing users to create stylized versions of scenes based on a given stylized view. The stylized view can be generated through various methods, including hand drawings, 2D image stylization techniques, or text-driven controllable generation (e.g., using ControlNet). Ref-NPR is also compatible with 3D objects represented in NeRF (Neural Radiance Fields) format.

Sourse Content	Hand Drawing Style Image	ControlNet "Chinese Painting"	ControlNet "Kyoto Animation"

For more examples, please refer our gallary in the project page.

Quick start

1. Install environment & Data download

bash ./create_env.sh
bash ./download_data.sh

2. (Optional) Photo-Realistic training (rendering) on all scenes

You can also utilize your pre-trained Plenoxel models with Ref-NPR. If you prefer not to apply basic PhotoRealistic (PR) models to all scenes, you can skip directly to step 3. This will automatically execute the appropriate PR model for the given scene.

cd opt
bash ../exps/base_pr/run_all_bases_syn.sh
bash ../exps/base_pr/run_all_bases_llff.sh
bash ../exps/base_pr/run_all_bases_tnt.sh

3. Run Ref-NPR

# Ref-NPR: 
# run_single.sh [style folder] [epoch_multi=2] [out_dir=./exps/refnpr]
bash ./exps/refnpr/run_single.sh ./data/ref_case/flower_colorful/

The optimized artistic radiance field is inside exps/refnpr/flower_control/exp_out, while the photorealistic one is inside opt/base_pr/ckpt_svox2/[scene_name(flower)].

(Optional) In addition to Ref-NPR, we provide implementations of ARF and SNeRF for comparison purposes. Please note that our SNeRF implementation is not the official version, as it is not open-sourced. We use Gatys' stylization module as a substitute in our SNeRF implementation.

# ARF: 
# run_single.sh [style folder] [epoch_multi=2] [out_dir=./exps/arf]
bash ./exps/arf/run_single.sh ./data/ref_case/flower_colorful/

# SNeRF: 
# run_single.sh [style folder] [epoch_multi=1] [out_dir=./exps/snerf]
bash ./exps/snerf/run_single.sh ./data/ref_case/flower_colorful/

4. Customization on own data

Training base on your own scene data:
Please follow the steps on Plenoxel to prepare your own custom training content data.

Use your own style reference:
If you want to customize your own style example, you can create a reference case follow the format as this:

├── data
│   ├── ref_case
│   │   ├── ref_case_1
│   │   │   ├── style.png
│   │   │   ├── data_config.json
│   │   ├── ref_case_2
│   │   │   ├── style.png
│   │   │   ├── data_config.json
└── ...

Here is an example of data_config.json. Please be noted that one of ["tmpl_idx_train", "tmpl_idx_test"] should be set to null.

To get content from training set, you can choose the image from training dataset. We provide a simple script to choose the content image and build a config. Inside this script, a dictionary is used to select scene and image.

python ./exps/ref_get_example.py

To get the test sequence content, you can run scripts ../exps/base_pr/render_all_bases_[dataset_name].sh (or part of it for a specific scene).

{
  "dataset_type": "llff",           # dataset type in ["llff", "synthetic", "tnt"]
  "scene_name": "flower",           # scene name in your used dataset
  "style_img": "./data/ref_case/flower_control/style.png", # path to reference image
  "tmpl_idx_train": null,           # index if you use a *TRAINING* set image as reference.
  "tmpl_idx_test": 112,             # index if you use a *TEST* set image as reference.
  "color_pre": true,                # whether enable the color matching loss [default true]
  "style_name": "flower_control"    # case name for output folders.
}

For multi-reference case, just use a list to store the style image and indexes:

{
  ...
  "style_img": ["./data/ref_case/playground/style_049.png",
                "./data/ref_case/playground/style_088.png",
                "./data/ref_case/playground/style_157.png"],
  "tmpl_idx_train": [49, 88, 157],
  ...
}

Citation

@inproceedings{
      zhang2023refnpr,
      title={Ref-{NPR}: Reference-Based Non-Photorealistic Radiance Fields for Controllable Scene Stylization},
      author={Zhang, Yuechen and He, Zexin and Xing, Jinbo and Yao, Xufeng and Jia, Jiaya},
      booktitle={CVPR},
      year={2023}
}

Acknowledgement and References:

This repository is built based on ARF. We would like to thank authors of Plenoxel and ARF for open-sourcing their wonderful implementations.