Spatio-temporal representation for face authentication by using multi-task learning with human attributes

For human identification, facial motion is useful in representing specific dynamic signature. In this paper, we present an effective spatio-temporal representation from facial motion as well as appearance by devising a 3D convolutional neural network (CNN). To maintain the intra-class invariance with limited number of training samples, a multi-task learning approach with human attributes, which are high-level semantic descriptions for identity, has been proposed. Identity-related human attributes can be leveraged to learn the 3D CNN. Comparative experiment has showed that the proposed method improves the performance of the face-based authentication system compared to conventional methods by effectively encoding facial appearance and motions with identity-related human attributes.