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A facial expression database is a collection of images or video clips with facial expressions of a range of emotions. Well-annotated ( emotion -tagged) media content of facial behavior is essential for training, testing, and validation of algorithms for the development of expression recognition systems .
However, an equals sign, a number 8, a capital letter B or a capital letter X are also used to indicate normal eyes, widened eyes, those with glasses or those with crinkled eyes, respectively. Symbols for the mouth vary, e.g. ")" for a smiley face or "(" for a sad face. One can also add a "}" after the mouth character to indicate a beard.
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Facial expression is the motion and positioning of the muscles beneath the skin of the face. These movements convey the emotional state of an individual to observers and are a form of nonverbal communication.
Face-angry_red.png (48 × 48 pixels, file size: 4 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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Microexpressions can be difficult to recognize, but still images and video can make them easier to perceive. In order to learn how to recognize the way that various emotions register across parts of the face, Ekman and Friesen recommend the study of what they call "facial blueprint photographs", photographic studies of "the same person showing all the emotions" under consistent photographic ...
In October 2018, a Wojak with a gray face, pointy nose and blank, emotionless facial expression, dubbed "NPC Wojak", became a popular visual representation for people who cannot think for themselves or make their own decisions, comparing them to non-player characters – computer-automated characters within a video game.