Deep Face Image Retrieval for Cancelable Biometric Authentication

This paper presents a cancelable biometric system for face authentication by exploiting the convolutional neural network (CNN)-based face image retrieval system. For the cancelable biometrics, we must build a template that achieves good performance while maintaining some essential conditions. First, the same template should not be used in different applications. Second, if the compromise event occurs, original biometric data should not be retrieved from the template. Last, the template should be easily discarded and recreated. Hence, we propose a Deep Table-based Hashing (DTH) framework that encodes CNN-based features into a binary code by utilizing the index of the hashing table. We employ noise embedding and intra-normalization that distorts biometric data, which enhances the non-invertibility. For training, we propose a new segment-clustering loss and pairwise Hamming loss with two classification losses. The final authentication results are obtained by voting on the outcome of the retrieval system. Experiments conducted on two large scale face image datasets demonstrate that the proposed method works as a proper cancelable biometric system.