The Microsoft Cognitive Services Emotion API recognizes emotions expressed by one or more people in an image, and returns a face identification bounding box. It detects the following emotions: happiness, sadness, surprise, anger, fear, contempt, and disgust. For video, it returns emotions of a group of faces over a period of time. 2 paid options are available, and a free plan that limits transactions to 30,000 a month is available as well. The Emotion API uses JSON for data exchange, and API Keys for authentication.
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The Microsoft Unconscious Bias C# Sample Code by James Sturtevant and Jennifer Marsman demonstrates how to analyze sentiment in emails. It promotes respect by cautioning users being overly positive or negative in their text tones.