sapiens2-matting-1b

Sapiens2-1B-Matting

Per-pixel human image matting with a soft alpha matte and pre-multiplied foreground RGB output.

This repository contains the 1B Human Matting checkpoint, finetuned from the Sapiens2-1B pretrained backbone.

• 📄 Paper: arXiv:2604.21681
• 🌐 Project Page: rawalkhirodkar.github.io/sapiens2
• 💻 Code: github.com/facebookresearch/sapiens2

Model Details

• Developed by: Meta
• Model type: Vision Transformer
• License: Sapiens2 License
• Task: Human image matting
• Base model: facebook/sapiens2-pretrain-1b
• Format: safetensors
• File: sapiens2_1b_matting.safetensors

Quick Start

Install the Sapiens2 repo (pip install -e .), download the checkpoint, and run the demo:

# 1. Download the checkpoint to $SAPIENS_CHECKPOINT_ROOT/matting/
hf download facebook/sapiens2-matting-1b sapiens2_1b_matting.safetensors \
    --local-dir ~/sapiens2_host/matting

# 2. Run the demo (edit INPUT, OUTPUT, and MODEL_NAME inside the script)
cd $SAPIENS_ROOT/sapiens/dense
./scripts/demo/matting.sh

See the Human Matting guide for details on inputs, outputs, and visualization options.

Model Card

Sapiens2-Matting Family

See the Sapiens2 Collection for all variants and other downstream task checkpoints.

Intended Use

• Human image matting on human-centric imagery
• Research on human-centric vision

License

Released under the Sapiens2 License.

Citation

@article{khirodkarsapiens2,
  title={Sapiens2},
  author={Khirodkar, Rawal and Wen, He and Martinez, Julieta and Dong, Yuan and Su, Zhaoen and Saito, Shunsuke},
  journal={arXiv preprint arXiv:2604.21681},
  year={2026}
}