Facial emotion recognition (FER) systems have gained significant attention in recent years due to their wide range of applications in various fields such as human-computer interaction, security, healthcare, and entertainment. This paper provides a comprehensive overview of FER systems, including their underlying principles, methodologies, technological advancements, and challenges. We delve into the historical context, the progression of FER technologies, state-of-the-art techniques, and future prospects in the domain.
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- et al. (2024) studied this question.