Point clouds-based Networks have achieved great attention in 3D object classification, segmentation and indoor scene semantic parsing. In terms of face recognition, 3D face recognition method which directly consume point clouds as input is still under study. Two main factors account for this: One is how to get discriminative face representations from 3D point clouds using deep network; the other is the lack of large 3D training dataset. To address these problems, a data-free 3D face recognition method is proposed only using synthesized unreal data from statistical 3D Morphable Model to train a deep point cloud network. To ease the inconsistent distribution between model data and real faces, different point sampling methods are used in train and test phase. In this paper, we propose a curvature-aware point sampling(CPS) strategy replacing the original furthest point sampling(FPS) to hierarchically down-sample feature-sensitive points which are crucial to pass and aggregate features deeply. A PointNet++ like Network is used to extract face features directly from point clouds. The experimental results show that the network trained on generated data generalizes well for real 3D faces. Fine tuning on a small part of FRGCv2.0 and Bosphorus, which include real faces in different poses and expressions, further improves recognition accuracy.

1. Download the BFM2017 h5 file model2017-1_face12_nomouth.h5. Move into /data.
2. Using GenerateTrainData.m to generate total 500,000 face scans.
3. Using PCL to computer normal and curvature.

Our work is based on erikwijmans/Pointnet2_PyTorch. We modify the sampling and network struture in our project. First, we should building ext moudle

python setup.py build_ext --inplace

then we can get a .so file in /pointnet2

Training examples are provided by pointnet2/train/train_cls.py and pointnet2/train/train_triplet.py. train_cls is used to pre-train on generated data and train_triplet is used to fine tune on real faces to get better results.

python -m pointnet2.train.train_cls
python -m pointnet2.train.train_triplet -model_checkpoint=checkpoints/model.pth.tar  --margin=0.3 --num_triplet=30000

the checkpoints/model.pth.tar is train_cls result.

FRGCv2

Bosphorus

FRGCv2 ROC curve