Table 1. Detailed technology used in analysis of 4Vs: vision, voice, verbal, and vital sign

Characteristic	Technology
Vision	• Technology that can recognize image information• Imitation of human visual function• Facial expressions, emotional expressions, eye movements, facial movements, etc.
Voice	• Technology that can recognize voice information• Imitation of human auditory function• Voice tone, size change, speed, pause change, pronunciation, etc.
Verbal	• Technology that can recognize language information• Imitation of human language functions• Speech to text (STT), Text to speech (TTS)• Understand meaning of words, vocabulary usage, etc.
Vital sign	• Physiological data measurement technology• Application of image information processing technology• Pulse information detected by subtle changes in facial muscles and colors