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TeethDreamer: 3D Teeth Reconstruction from Five Intra-oral Photographs

Chenfan Xu*, Zhentao Liu*, Yuan Liu, Yulong Dou, Jiamin Wu, Jiepeng Wang, Minjiao Wang, Dingggang Shen, and Zhiming Cui<sup>+</sup>.

[Paper]|[Project Page]

Inference code and pretrained models.
Training code.

Demo

Five intra-oral photos in example/oral.
Segmented teeth images in example/teeth.
Generated images and Reconstruction.

Getting started

Install packages in requirements.txt. We test our model on a 40G A100 GPU with 11.6 CUDA and 1.12.0 pytorch.

conda create -n TeethDreamer
conda activate TeethDreamer
pip install torch==1.12.0+cu116 torchvision==0.13.0+cu116 torchaudio==0.12.0 --extra-index-url https://download.pytorch.org/whl/cu116
pip install -r requirements.txt

Download pretrained model checkpoints

Inference

Make sure you have the following models.

SyncDreamer
|-- ckpt
    |-- ViT-L-14.ckpt
    |-- TeethDreamer.ckpt
    |-- zero123-xl.ckpt
    |-- sam_vit_b_01ec64.pth

Segment upper and lower teeth from your five intral-oral photos. You can use our script seg_teeth.py in the command line. Before that, you need renumber your five intral-oral images by 0~4 corresponding to anterior view, left buccal view, right buccal view, maxillary occlusal view, and mandibular occlusal view. And then you can manually segment upper teeth and lower teeth by clicking left mouse button in the target area within the interactive interface created by our script.

Tips: You can refer to image files in example folder.

python seg_teeth.py --img directory/of/your/intra-oral/images \
                    --seg directory/to/store/segmented/images \
                    --suffix suffix/of/your/image/files

Tips: You need segment upper teeth for the first four intra-oral images and then lower teeth for the last four images. If unexpected regions are segmented, you can click the right mouse button to label the irrelevant area.

Make sure you have following file structure.

|-- your_seg_dir
    |-- XXX_norm_lower
    |-- XXX_norm_upper

Generate color and normal images of eight viewpoints.

python TeethDreamer.py -b configs/TeethDreamer.yaml \
                       --gpus 0 \
                       --test ckpt/TeethDreamer.ckpt \
                       --output directory/to/store/generated/images \
                       data.params.test_dir=directory/of/segmented/images

(Optional) Segment foreground of the generated image manually which is necessary for Neus (Because the foreground mask automatically generated by rembg package may be wrong sometimes)

python seg_foreground.py --img path/to/your/generated/image \
                         --seg path/to/your/segmented/image \

Reconstruct tooth model from generation by Neus.

cd instant-nsr-pl
python run.py --img ../example/results/generation/1832_upper_cond_000_000_000_000.png" \
              --cpu 4 \
              --dir ../example/results/reconstruction/ \
              --normal \
              --rembg

Explanation:

--img is the path to your generated image
--cpu is the number of your CPU cores
--dir is the directory to store reconstruction
--normal indicates the generation includes normal images
--rembg indicates background removement (The foreground mask is necessary here)

Data Preparation for Training

Make sure you have normalized tooth models which are segmented from intra-oral scanning models.
Render color and normal images by blender scripts. We test following scripts on Windows with Blender 4.0.1

blender --background
        --python normal_render.py
        -- --object_path path/to/your/tooth/model
        --target_dir directory/to/store/rendered/normal/images
        --input_dir directory/to/store/rendered/condition/images

blender --background
        --python color_render.py
        -- --object_path path/to/your/tooth/model
        --target_dir directory/to/store/rendered/color/images
        --input_dir directory/to/store/rendered/condition/images

Explanation: normal_render.py only renders target normal images with fixed viewpoints set by view16 dictionary. color_render.py renders condition images corresponding to segmented intra-oral photos taken by dentists and target color images. 3. Make sure you have a pkl file which includes a dictionary with train, val keys and corresponding lists including cases' ids such as XXX_norm_lower and XXX_norm_upper. 4. Check if your directory of rendering data has following structures.

Data
|-- target
|-- normal
|-- input
|-- mv-splits.pkl

Explanation: The target folder is the directory of your rendered color images which is the argument target_dir in the script color_render.py.

The normal folder is the directory of your rendered normal images which is the argument target_dir in the script normal_render.py.

The input folder is the directory of your rendered condition images which is the argument input_dir in the script color_render.py.

The mv-splits.pkl file is the pkl file mentioned in the previous step. 5. Finetune pretrained zero123 model on your own data.

python TeethDreamer.py -b configs/TeethDreamer.yaml \
                       --gpus 0 \
                       --finetune_from ckpt/zero123-xl.ckpt \
                       data.target_dir=path/to/your/target/folder \
                       data.input_dir=path/to/your/input/folder \
                       data.uid_set_pkl=path/to/your/pkl/file \
                       data.validation_dir=path/to/your/input/folder

Acknowledgement

We have intensively borrow codes from the following repositories. Many thanks to the authors for sharing their codes.

Citation

If you find this repository useful in your project, please cite the following work. :)

@InProceedings{10.1007/978-3-031-72104-5_68,
author="Xu, Chenfan and Liu, Zhentao and Liu, Yuan and Dou, Yulong and Wu, Jiamin and Wang, Jiepeng and Wang, Minjiao and Shen, Dinggang and Cui, Zhiming",
editor="Linguraru, Marius George and Dou, Qi and Feragen, Aasa and Giannarou, Stamatia and Glocker, Ben and Lekadir, Karim and Schnabel, Julia A.",
title="TeethDreamer: 3D Teeth Reconstruction from Five Intra-Oral Photographs",
booktitle="Medical Image Computing and Computer Assisted Intervention -- MICCAI 2024",
year="2024",
publisher="Springer Nature Switzerland",
address="Cham",
pages="712--721",
isbn="978-3-031-72104-5"
}