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In posed expression databases, the participants are asked to display different basic emotional expressions, while in spontaneous expression database, the expressions are natural. Spontaneous expressions differ from posed ones remarkably in terms of intensity, configuration, and duration. Apart from this, synthesis of some AUs are barely achievable without undergoing the associated emotional state. Therefore, in most cases, the posed expressions are exaggerated, while the spontaneous ones are subtle and differ in appearance.
Many publicly and commercially available databases are categorized here.<ref>{{Cite web|url=http://emotion-research.net/wiki/Databases|title=collection of emotional databases|archive-url=https://web.archive.org/web/20180325205102/http://emotion-research.net/wiki/Databases|archive-date=2018-03-25|url-status=dead}}</ref><ref>{{Cite web|url=https://www.ecse.rpi.edu/~cvrl/database/other_facial_expression.htm|title=facial expression databases}}</ref> Here are some details of the [[facial expression]] databases.
{| class="wikitable"
!Database
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!Ground truth
!Type
|-
|[https://hume.ai/solutions/faces Hume AI - Facial Expressions]
|Admiration, Adoration, Aesthetic Appreciation, Amusement, Anger, Anxiety, Awe, Awkwardness, Boredom, Calmness, Concentration, Contemplation, Confusion, Contempt, Contentment, Craving, Determination, Disappointment, Disgust, Distress, Doubt, Ecstasy, Embarrassment, Empathic Pain, Entrancement, Envy, Excitement, Fear, Guilt, Horror, Interest, Joy, Love, Nostalgia, Pain, Pride, Realization, Relief, Roman, Sadness, Satisfaction, Sexual Desire, Shame, Surprise (Negative), Surprise (Positive), Sympathy, Tiredness, and Triumph
|2,000+ Male and 2,000+ Female
|Over 330,000 images
|Color
|Variable
|48 self-reported emotion categories, free response, valence and arousal
|Mimicry and posed
|-
|[https://hume.ai/solutions/reactions/ Hume - Evoked Emotion]
|Admiration, Adoration, Aesthetic Appreciation, Amusement, Anger, Anxiety, Awe, Awkwardness, Boredom, Calmness, Concentration, Contemplation, Confusion, Contempt, Contentment, Craving, Determination, Disappointment, Disgust, Distress, Doubt, Ecstasy, Embarrassment, Empathic Pain, Entrancement, Envy, Excitement, Fear, Guilt, Horror, Interest, Joy, Love, Nostalgia, Pain, Pride, Realization, Relief, Roman, Sadness, Satisfaction, Sexual Desire, Shame, Surprise (Negative), Surprise (Positive), Sympathy, Tiredness, and Triumph
|1,000+ Male and 1,000+ Female
|Over 170,000 videos
|Color
|Variable
|48 self-reported emotion categories, free response, valence and arousal
|Spontaneous reactions
|-
|FERG-3D-DB (Facial Expression Research Group 3D Database) for stylized characters <ref>Aneja, Deepali, et al. "Learning to generate 3D stylized character expressions from humans." 2018 IEEE Winter Conference on Applications of Computer Vision (WACV). IEEE, 2018.</ref>
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