😈BAD-Gaussians: Bundle-Adjusted Deblur Gaussian Splatting

This as an official implementation of our arXiv 2024 paper BAD-Gaussians: Bundle Adjusted Deblur Gaussian Splatting, based on the nerfstudio framework.

Demo

Deblurring & novel-view synthesis results on Deblur-NeRF's real-world motion-blurred data:

bad-gaussians-decoration.x264.2400.3M.mp4

Left: BAD-Gaussians deblured novel-view renderings;

Right: Input images.

Quickstart

1. Installation

You may check out the original nerfstudio repo for prerequisites and dependencies. Currently, our codebase is build on top of the latest version of nerfstudio (v1.0.3), so if you have an older version of nerfstudio installed, please git clone the main branch and install the latest version.

TL;DR: You can install nerfstudio with:

# (Optional) create a fresh conda env
conda create --name nerfstudio -y python=3.10
conda activate nerfstudio

# install dependencies
pip install --upgrade pip setuptools
pip install torch==2.1.2+cu118 torchvision==0.16.2+cu118 --extra-index-url https://download.pytorch.org/whl/cu118

conda install -c "nvidia/label/cuda-11.8.0" cuda-toolkit
pip install ninja git+https://github.com/NVlabs/tiny-cuda-nn/#subdirectory=bindings/torch

# install nerfstudio!
git clone https://github.com/nerfstudio-project/nerfstudio
cd nerfstudio
pip install -e .

Besides, we use pypose to implement the pose interpolation. You can install it with:

pip install pypose

Then you can clone and install this repo as a Python package with:

git clone https://github.com/WU-CVGL/BAD-Gaussians
cd BAD-Gaussians
pip install -e .

2. Prepare the dataset

Deblur-NeRF Synthetic Dataset (Re-rendered)

As described in the previous BAD-NeRF paper, we re-rendered Deblur-NeRF's synthetic dataset with 51 interpolations per blurry image.

Additionally, in the previous BAD-NeRF paper, we directly run COLMAP on blurry images only, with neither ground-truth camera intrinsics nor sharp novel-view images. We find this is quite challenging for COLMAP - it may fail to reconstruct the scene and we need to re-run COLMAP for serval times. To this end, we provided a new set of data, where we ran COLMAP with ground-truth camera intrinsics over both blurry and sharp novel-view images, named bad-nerf-gtK-colmap-nvs:

Download link

Deblur-NeRF Real Dataset

You can directly download the real_camera_motion_blur folder from Deblur-NeRF.

Your Custom Dataset

1. Use the ns-process-data tool from Nerfstudio to process deblur-nerf training images.

   For example, if the dataset from BAD-NeRF is in llff_data, execute:

   ns-process-data images \
       --data llff_data/blurtanabata/images \
       --output-dir data/my_data/blurtanabata
   

2. The folder data/my_data/blurtanabata is ready.

Note: Although nerfstudio does not model the NDC scene contraction for LLFF data, we found that scale_factor = 0.25 works well on LLFF datasets. If your data is captured in a LLFF fashion (i.e. forward-facing), instead of object-centric like Mip-NeRF 360, you can pass the scale_factor = 0.25 parameter to the nerfstudio dataparser (which is already set to default in our DeblurNerfDataParser), e.g., ns-train bad-gaussians --data data/my_data/my_seq --vis viewer+tensorboard nerfstudio-data --scale_factor 0.25

3. Training

1. For Deblur-NeRF synthetic dataset, train with:

   ns-train bad-gaussians \
       --data data/bad-nerf-gtK-colmap-nvs/blurtanabata \
       --pipeline.model.camera-optimizer.mode "linear" \
       --vis viewer+tensorboard \
       deblur-nerf-data

   where

   • --data data/bad-nerf-gtK-colmap-nvs/blurtanabata is the relative path of the data sequence;
   • --pipeline.model.camera-optimizer.mode "linear" enables linear camera pose interpolation
   • --vis viewer+tensorboard enables both the viewer and the tensorboard metrics saving
   • deblur-nerf-data chooses the DeblurNerfDataparser

2. For Deblur-NeRF real dataset with downscale_factor=4, train with:

   ns-train bad-gaussians \
       --data data/real_camera_motion_blur/blurdecoration \
       --pipeline.model.camera-optimizer.mode "cubic" \
       --vis viewer+tensorboard \
       deblur-nerf-data \
       --downscale_factor 4

   where

   • --pipeline.model.camera-optimizer.mode "cubic" enables cubic B-spline;
   • --downscale_factor 4 after the deblur-nerf-data tells the DeblurNerfDataparser to downscale the images' width and height to 1/4 of its originals.

3. For Deblur-NeRF real dataset with full resolution, train with:

   ns-train bad-gaussians \
       --data data/real_camera_motion_blur/blurdecoration \
       --pipeline.model.camera-optimizer.mode "cubic" \
       --pipeline.model.camera-optimizer.num_virtual_views 15 \
       --pipeline.model.num_downscales 2 \
       --pipeline.model.resolution_schedule 3000 \
       --vis viewer+tensorboard \
       deblur-nerf-data

   where

   • --pipeline.model.camera-optimizer.mode "cubic" enables cubic B-spline;
   • --pipeline.model.camera-optimizer.num_virtual_views 15 increases the number of virtual cameras to 15;
   • --pipeline.model.num_downscales 2 and --pipeline.model.resolution_schedule 3000 enables coarse-to-fine training.

4. For custom data processed with ns-process-data, train with:

   ns-train bad-gaussians \
       --data data/my_data/blurtanabata \
       --vis viewer+tensorboard \
       nerfstudio-data --eval_mode "all"

   Note: To improve reconstruction quality on your custom dataset, you may need to add some of the parameters to enable cubic B-spline, more virtual cameras and coarse-to-fine training, as shown in the examples above.

4. Render videos

This command will generate a trajectory with the camera poses of the training images, keeping their original order, interplate 10 frames between adjacent images with a frame rate of 30. It will load the config.yml and save the video to renders/<your_filename>.mp4.

ns-render interpolate \
  --load-config outputs/blurtanabata/bad-gaussians/<your_experiment_date_time>/config.yml \
  --pose-source train \
  --frame-rate 30 \
  --interpolation-steps 10 \
  --output-path renders/<your_filename>.mp4

Note1: You can add the --render-nearest-camera True option to compare with the blurry inputs, but it will slow down the rendering process significantly.

Note2: The working directory when executing this command must be the parent of outputs, i.e. the same directory when training.

Note3: You can find more information of this command in the nerfstudio docs.

5. Export the 3D Gaussians

This command will load the config.yml and export a splat.ply into the same folder:

ns-export gaussian-splat \
    --load-config outputs/blurtanabata/bad-gaussians/<your_experiment_date_time>/config.yml \
    --output-dir outputs/blurtanabata/bad-gaussians/<your_experiment_date_time>

Note1: We use rasterize_mode = antialiased by default. However, if you want to export the 3D gaussians, since the antialiased mode (i.e. Mip-Splatting) is not supported by most 3D-GS viewers, it is better to turn if off during training using: --pipeline.model.rasterize_mode "classic"

Note2: The working directory when executing this command must be the parent of outputs, i.e. the same directory when training.

Then you can visualize this file with any viewer, for example the WebGL Viewer.

6. Debug with your IDE

Open this repo with your IDE, create a configuration, and set the executing python script path to <nerfstudio_path>/nerfstudio/scripts/train.py, with the parameters above.

Citation

If you find this useful, please consider citing:

@misc{zhao2024badgaussians,
    title={{BAD-Gaussians: Bundle Adjusted Deblur Gaussian Splatting}},
    author={Zhao, Lingzhe and Wang, Peng and Liu, Peidong},
    year={2024},
    eprint={2403.11831},
    archivePrefix={arXiv},
    primaryClass={cs.CV}
}

Acknowledgment

• Kudos to the Nerfstudio contributors for their amazing work:

@inproceedings{nerfstudio,
	title        = {Nerfstudio: A Modular Framework for Neural Radiance Field Development},
	author       = {
		Tancik, Matthew and Weber, Ethan and Ng, Evonne and Li, Ruilong and Yi, Brent
		and Kerr, Justin and Wang, Terrance and Kristoffersen, Alexander and Austin,
		Jake and Salahi, Kamyar and Ahuja, Abhik and McAllister, David and Kanazawa,
		Angjoo
	},
	year         = 2023,
	booktitle    = {ACM SIGGRAPH 2023 Conference Proceedings},
	series       = {SIGGRAPH '23}
}

@software{Ye_gsplat,
    author  = {Ye, Vickie and Turkulainen, Matias, and the Nerfstudio team},
    title   = {{gsplat}},
    url     = {https://github.com/nerfstudio-project/gsplat}
}

@misc{ye2023mathematical,
    title={Mathematical Supplement for the $\texttt{gsplat}$ Library}, 
    author={Vickie Ye and Angjoo Kanazawa},
    year={2023},
    eprint={2312.02121},
    archivePrefix={arXiv},
    primaryClass={cs.MS}
}