Abstract
The world today is being hit by COVID-19. As opposed to fingerprints and ID cards, facial recognition technology can effectively prevent the spread of viruses in public places because it does not require contact with specific sensors. However, people also need to wear masks when entering public places, and masks will greatly affect the accuracy of facial recognition. Accurately performing facial recognition while people wear masks is a great challenge. In order to solve the problem of low facial recognition accuracy with mask wearers during the COVID-19 epidemic, we propose a masked-face recognition algorithm based on large margin cosine loss (MFCosface). Due to insufficient masked-face data for training, we designed a masked-face image generation algorithm based on the detection of the detection of key facial features. The face is detected and aligned through a multi-task cascaded convolutional network; and then we detect the key features of the face and select the mask template for coverage according to the positional information of the key features. Finally, we generate the corresponding masked-face image. Through analysis of the masked-face images, we found that triplet loss is not applicable to our datasets, because the results of online triplet selection contain fewer mask changes, making it difficult for the model to learn the relationship between mask occlusion and feature mapping. We use a large margin cosine loss as the loss function for training, which can map all the feature samples in a feature space with a smaller intra-class distance and a larger inter-class distance. In order to make the model pay more attention to the area that is not covered by the mask, we designed an Att-inception module that combines the Inception-Resnet module and the convolutional block attention module, which increases the weight of any unoccluded area in the feature map, thereby enlarging the unoccluded area’s contribution to the identification process. Experiments on several masked-face datasets have proved that our algorithm greatly improves the accuracy of masked-face recognition, and can accurately perform facial recognition with masked subjects.
Highlights
As a convenient and fast method of identification, facial recognition technology has been widely used in the fields of public security, financial business, justice, and criminal investigation
This paper proposes a masked-face recognition algorithm based on large margin cosine loss (MFCosface)
Experiments on our artificial masked-face dataset and a real masked-face image dataset proved that our algorithm greatly improves the accuracy of masked-face recognition, and can accurately perform facial recognition in spite of mask occlusion
Summary
As a convenient and fast method of identification, facial recognition technology has been widely used in the fields of public security, financial business, justice, and criminal investigation. Facial recognition technology extracts facial features for classification and recognition, and it is has been one of the hotspots of research in recent years [1]. The current identification methods based on ID cards and fingerprints require contact with specific sensors, and facial recognition technology can avoid this unnecessary contact to a certain extent, avoiding the spread of COVID-19. Wearing a mask affects the extraction of facial features [3,4], leading to low recognition accuracy, so the algorithm research on masked-face recognition has great practical significance at the moment [5]
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