A Survey of Deep Learning-based Facial Expression Recognition Research

Facial expression is one of the ways to convey emotional expression. Deep learning is used to analyze facial expression to understand people's true feelings, and human-computer interaction is integrated into it. However, in the natural real environment and various interference (such as lighting, age and ethnicity), facial expression recognition will face many challenges. In recent years, with the development of artificial intelligence, scholars have studied more and more facial expression recognition in the case of interference, which not only promotes the theoretical research, but also makes it popularized in the application. Facial expression recognition is to identify facial expressions to carry out emotion analysis, and emotion analysis can be analyzed with the help of facial expressions, speech, text, video and other signals. Therefore, facial expression recognition can be regarded as a research direction of emotion analysis. This paper focuses on the perspective of facial expression recognition to summarize. In the process of facial expression recognition, researchers usually try to combine multiple modal information such as voice, text, picture and video for analysis. Due to the differences between single-modal data set and multi-modal data set, this paper will analyze static facial expression recognition, dynamic facial expression recognition and multi-modal fusion. This research has a wide range of applications, such as: smart elderly care, medical research, detection of fatigue driving and other fields.