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Classification | Particular factors |
| Population demographics |
Age, ethnic origin, gender,
occupation, etc. |
Application |
Template aging, shooting time,
User friendliness, user motivation, etc. |
User physiology |
Hair, baldness, illnesses and diseases,
eyelashes, nail length, skin tone, etc. |
User behavior |
Facial expression, dialect, motion,
posture, angle, distance, stress, nervousness, etc. | Environmental influences |
Background features (color, shadow,
sound, etc.), lighting strength and direction, weather, (temperature,
humidity, rain, snow,
etc.) |
User appearance | Outfit (hat, sleeves, pants, dress shoes, etc.), band (bandage), contact lenses,
makeup, glasses, fake nails, hairstyle, rings, tattoos, etc. |
Sensor | Dirt on camera lenses, focus, sensor quality, | and hardware | sensor change, transmission
channel, etc. |
User interface | Feedback, instructions, supervising director |
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