SDPose-Body

SDPose: Exploiting Diffusion Priors for Out-of-Domain and Robust Pose Estimation (Body - 17 Keypoints)

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Model Description

SDPose is a state-of-the-art human pose estimation model that leverages the powerful visual priors from Stable Diffusion to achieve exceptional performance on out-of-distribution (OOD) scenarios. This model variant estimates 17 COCO body keypoints including nose, eyes, ears, shoulders, elbows, wrists, hips, knees, and ankles.

Model Architecture

SDPose employs a U-Net backbone initialized with Stable Diffusion v2 weights, combined with a specialized heatmap head for keypoint prediction. The model operates in a top-down manner:

1. Person Detection: Detect human bounding boxes using an object detector (e.g., YOLO11-x)
2. Pose Estimation: Crop and estimate 17 body keypoints for each detected person
3. Heatmap Generation: Produce confidence heatmaps for precise keypoint estimation

Model Specifications:

• Backbone: Stable Diffusion v2 U-Net (fine-tuned; minimal architectural changes)
• Head: Custom heatmap prediction head
• Input Resolution: 1024×768 (H×W)
• Output: 17 keypoint heatmaps + coordinates with confidence scores
• Framework: MMPose

Supported Keypoints (COCO Format)

The model predicts 17 body keypoints following the COCO keypoint format:

0: nose
1: left_eye
2: right_eye
3: left_ear
4: right_ear
5: left_shoulder
6: right_shoulder
7: left_elbow
8: right_elbow
9: left_wrist
10: right_wrist
11: left_hip
12: right_hip
13: left_knee
14: right_knee
15: left_ankle
16: right_ankle

Intended Use

Primary Use Cases

• Human pose estimation in natural images
• Pose estimation in artistic and stylized domains (paintings, anime, sketches)
• Animation and video pose tracking
• Cross-domain pose analysis and research
• Applications requiring robust pose estimation under distribution shifts

How to Use

Installation

# Clone the repository
git clone https://github.com/t-s-liang/SDPose-OOD.git
cd SDPose-OOD

# Install dependencies
pip install -r requirements.txt
# Download YOLO11-x for human detection
wget https://github.com/ultralytics/assets/releases/download/v8.3.0/yolo11x.pt -P models/

# Launch Gradio interface
cd gradio_app
bash launch_gradio.sh

Training Data

Datasets

Trained exclusively on COCO-2017 train2017 (no extra data).

• COCO (Common Objects in Context): 200K+ images with 17 body keypoints

Preprocessing

• Images are resized and cropped to 1024×768 resolution
• Augmentation: random horizontal flip, half-body & bbox transforms, UDP affine; Albumentations (Gaussian/Median blur, coarse dropout).
• Heatmaps: UDP codec (MMPose style).

Comparison with Baselines

SDPose significantly outperforms traditional pose estimation models (e.g., Sapiens, ViTPose++) on out-of-distribution benchmarks while maintaining competitive performance on in-domain data.

See our paper for comprehensive evaluation results.

Citation

If you use SDPose in your research, please cite our paper:

@misc{liang2025sdposeexploitingdiffusionpriors,
      title={SDPose: Exploiting Diffusion Priors for Out-of-Domain and Robust Pose Estimation}, 
      author={Shuang Liang and Jing He and Chuanmeizhi Wang and Lejun Liao and Guo Zhang and Yingcong Chen and Yuan Yuan},
      year={2025},
      eprint={2509.24980},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={https://arxiv.org/abs/2509.24980}, 
}

License

This model is released under the MIT License.

Additional Resources

• 🌐 Project Website: https://t-s-liang.github.io/SDPose
• 📄 Paper: arXiv:2509.24980
• 💻 Code Repository: GitHub
• 🤗 Demo: HuggingFace Space
• 📧 Contact: [email protected]

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