Table 2.

Classification of HCI technologies

Technology areas	Encompass	References
Cognition and meaning understanding	Facial/gesture tracking & recognition	[41–53]
	Text & code recognition	[54, 55]
	Voice recognition	[56]
	Identity recognition	[57]
	Image description	[58]
Wearable technologies	Head-mounted devices	[42, 45, 47–50, 53, 59–61]
	Smart belts	[44, 45, 49, 50, 60]
	Smart watches/bands	[57, 62, 63]
	Smart jewels	[64]
	Smart vest	[65]
Social network & communication	Online social platforms	[21, 66–72]
	Video/audio communication	[66–69, 73–76]
	Messaging communication	[23, 54, 66, 68, 69, 75]
Multimedia technologies	Media playing/recording/sharing system	[21, 51, 55, 66, 67, 72, 74, 77–81]
	Interpretation systems	[56, 82]
Human-interface technology	Haptic interface	[65, 83–85]
	Tangible interface	[21, 76, 86–88]
	Touchscreen interface	[80, 81, 89]
	Semi-transparent Video Interface	[90]
Sensor and device network	Distributed/Multiagent systems	[42, 87, 91–94]
	Multi-device systems	[14, 39, 44, 49, 61, 85]
Virtual Reality (VR)	Therapeutic VR applications	[25, 71, 96]
	360 videos and images	[97]
	Immersive touring application	[97]
Ambient intelligence (AmI)	Ambient displays	[22, 79, 91]
	Ambient lightings	[22, 98]
Electronic measurement	Social environment tracking and navigation	[55, 93, 99]
	Head gesture recognition	[47]
Augmented Reality (AR)	Mobile application	[13]
	Technology mediated sight	[59]
Others	Affective avatar taxonomy	[100]