Solution for ChaLearn Face Anti-spoofing Attack Detection Challenge @ CVPR2019 by a.parkin (VisionLabs)

Our method uses a modified network architecture in [1]. As shown on image, the RGB, Depth and IR inputs are processed by separate streams followed by the concatenation and fully-connected layers. Differently from [1] we use aggregation blocks (Agg res2, ...) to aggregate outputs from multiple layers of the network. We pre-train network weights on four different tasks for face recognition and gender recognition. We then fine- tune these networks separately on the training set of the CASIA-SURF face anti-spoofing dataset. To increase the robustness to various attacks, we ensemble networks trained on three training folds and with two initial seeds. Results of our models evaluated separately and in combination are illustrated in table.

NN1	NN1a	NN2	NN3	NN4	seed	Val trp@fpr=10e-4	Test trp@fpr=10e-4
✔️						0.9943
	✔️					0.9987
		✔️				0.9870
			✔️			0.9963
				✔️		0.9933
✔️		✔️				0.9963
✔️		✔️	✔️			0.9983
✔️		✔️	✔️		✔️	0.9997
✔️		✔️	✔️	✔️	✔️	1.0000
	✔️	✔️	✔️	✔️	✔️	1.0000	0.9988

References

[1] Shifeng Zhang, Xiaobo Wang, Ajian Liu, Chenxu Zhao, Jun Wan, Ser- gio Escalera, Hailin Shi, Zezheng Wang, Stan Z. Li, ”CASIA-SURF: A Dataset and Benchmark for Large-scale Multi-modal Face Anti-spoofing”, arXiv, 2018.

Environment

Сreating the conda environment and installing the required libraries

conda create --name python3 --file spec-file.txt;
conda activate python3;
pip install -r requirements.txt

Train

Used pretrained models for face or gender recognition

Exp. Name	Model architecture	Train description	Architecture	Weights
exp1_2stage	resnet caffe34	CASIA, sphere loss	MCS2018	Google Drive
exp2	resnet caffe34	Gender classifier on AFAD-Lite	./attributes_trainer	Google Drive
exp3b	IR50	MSCeleb, arcface	face.evoLVe.PyTorch	Google Drive
exp3c	IR50	asia(private) dataset, arcface	face.evoLVe.PyTorch	Google Drive

Step 1 (can be skipped)

Download all pretrained models (Google Drive) and challenge train/val/test data

Step 2 (can be skipped)

Download AFAD-Lite and train a model for gender recognition task

Step 3 (can be skipped)

Train models:

• exp1
• exp2
• exp3b
• exp3c

or run train.sh

Inference

Step 1 (can be skipped)

Step 1.1

Change data_root path in datasets/init_dataloader.py:23

Step 1.2

Run all prepaired models from data/opts/ and use inference.py or inference.sh

Step 2

ensemble all results

python ensemble.py