Table 4.

Mostly used emotion recognition datasets.

Expression	Database	Posed/ In the Wild	Images/Videos	Type	Subjects	Expressions	References
Facial Macro	FER-2013 [60]	in the wild	35,000 images	gray	-	anger, disgust, fear, happiness, sadness, surprise, neutral	[61,62,63]
	CK+ [64]	posed	593 images	mostly gray	123	neutral, sadness, surprise, happiness, fear, anger, contempt, disgust	[61,65,66,67,68,69]
	JAFFE [70]	posed	213 images	gray	10	neutral, sadness, surprise, happiness, fear, anger, disgust	[61,67,68,71]
	RAF-DB [72]	in the wild	29,000 images	color	300+	anger, disgust, fear, happiness, sadness, surprise, neutral	[72]
	AffectNET [73]	in the wild	950,000	color	-	neutral, happiness, sadness, surprise, fear, disgust, anger, and contempt	[45,74]
	Aff-Wild2 [75]	in the wild	2,800,000	color	458	neutral, happiness, sadness, surprise, fear, disgust, anger + valence–arousal + action units 1, 2, 4, 6, 12, 15, 20, 25	[76]
Facial Micro	CASME [77]	posed	195 images	color	19	amusement, sadness, disgust, surprise, contempt, fear, repression, tense	[78]
	CASME II [79]	posed	247 images	color	26	happiness, disgust, surprise, repression, and others	[40,41,78,80]
Gestures	MHHRI [81]	posed	48 videos	color	18	self-/acquaintance-assessed personality, self-reported engagement	[12]
Static Poses	EMOTIC [82]	in the wild	18,313 images	color	18	anger, fatigue, fear, happiness, sadness, pain, confidence, and others	[13]