Samsung GP9ATSCH-1 E-Manual page 219

Requirements for using Face Recognition
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Be sure to use Face Recognition within recommended distances:
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UN105S9WAF model: between 4.9 ft and 11.4 ft
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UHD 9000, UN110S9BF and SEK-2500U models: between 4.9 ft and 13.1 ft
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The appropriate ambient brightness is 50 to 500 lux. (100 Lux: Bathroom, 400 Lux: Living Room)
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Face Recognition can recognize up to 5 different users at a time.
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The TV may have difficulty recognizing twins and people with similar faces as two different
individuals.
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Note the following when using Face Recognition:
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Do not cover your face with a hat, a pair of sunglasses, or your hair.
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Your entire face must be visible to the camera. Avoid shadows over your face. Shadows
prevent the camera from recognizing faces accurately.
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Keep your expression as neutral as possible. In addition, keep your mouth closed and as
neutral as possible.
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When you log into your Samsung account, your facial expression must be the same as the
facial expression you had when you registered.