Abstract
Facial expression recognition (FER) is the current hot research topic, and it is widely used in the fields of pattern recognition, computer vision and artificial intelligence. As it is an important part of intelligent human-computer interaction technology, the FER has received widespread attention in recent years, and researchers in different fields have proposed many approaches for it. This paper reviews recent developments on FER approaches and the key technologies involved in the FER system: face detection and preprocessing, facial expression feature extraction and facial expression classification, which are analyzed and summarized in detail. Finally, the state-of-the-art of the FER is summarized, and its future development direction is pointed out.
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