Samsung LED 6400 Series E-Manual page 214

Requirements for using Face Recognition
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You should be located between 1.5m and 4.0m from the camera. The actual recognition range
may vary depending on the camera angle and other factors.
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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 recognise up to 5 different users at a time.
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The TV may have difficulty recognising 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 recognising your face 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. Facial expression you had during the
registration process.