Combined training strategy for low‐resolution face recognition with limited application‐specific data

Application‐specific data for certain biometric applications are often not sufficiently available. The authors present a solution for face recognition with limited application‐specific data. Existing methods often use a classifier with convolutional neural networks (CNNs) as feature extractors. The CNNs are trained with massive general (i.e. not application specific) data and the classifier is trained with application‐specific data. Alternatively, the authors propose a combined training strategy to train the classifier on a balanced mixture of general and application‐specific data, such that the recognition performance is maximised. The proposed method largely alleviates the needs for application‐specific data. To prove its effectiveness, they apply the proposed method to low‐resolution face recognition. Specifically, they use the heterogeneous joint Bayesian (HJB) classifier that is capable of comparing features from the same modality but with different characteristics. To further boost performance, the authors augment the training data by pre‐processing it to resemble application‐specific data. They conducted extensive experiments on challenging datasets, namely, SCface and COX. The results show that the proposed method improves the true match rate on SCface at a false match rate of 10% by ∼11% and the true match rate on COX at a false match rate of 1% by ∼12%.