How AI Analyzes facial expressions?

Until now, most AI-related news reports have been related to image recognition and voice recognition, but with the evolution of AI, it is likely that there will be more reports and discussions on sentiment analysis AI in the future. In the United States, sentiment analysis AI that works on online conferencing systems has recently appeared one after another and has become a subject of controversy. For example, Silicon Valley startup Uniphore announced on March 1, 2022, the sentiment analysis AI "Q for Sales" aimed at supporting business negotiations . It is a sentiment analysis AI that uses computer vision, tonal analysis, conversation analysis, natural language processing, etc. It is said to read emotions from the facial expressions of the business partner and increase the business negotiation success rate.