Face anti-spoofing is essential to prevent face recognition systems from a security breach. Much of the progresses have been made by the availability of face anti-spoofing benchmark datasets in recent years. However, existing face anti-spoofing benchmarks have limited number of subjects ($\le\negmedspace170$) and modalities ($\leq\negmedspace2$), which hinder the further development of the academic community. To facilitate future face anti-spoofing research, we introduce a large-scale multi-modal dataset, namely CASIA-SURF, which is the largest publicly available dataset for face anti-spoofing both in terms of subjects and visual modalities. Specifically, it consists of $1,000$ subjects with $21,000$ videos and each sample has $3$ modalities (i.e., RGB, Depth and IR). Associated with this dataset, we also provide concrete measurement set, evaluation protocol and training/validation/testing subsets, developing a new benchmark for face anti-spoofing. Moreover, we present a new multi-modal fusion method as a strong baseline, which performs feature re-weighting to select the more informative channel features while suppressing less useful ones for each modal. Extensive experiments have been conducted on the proposed dataset to verify its significance and generalization capability.

CASIA-SURF是迄今最大的人脸反欺诈公共数据集，提出了一种基于特征重新加权的多模态融合方法，并在数据集上进行了广泛的实验，验证了其重要性和通用性。

用于大规模多模态面部防欺诈的数据集和基准