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# Factors Affecting Face Analysis Performance

Estimating face demographics and expression is a complex operation and therefore requires a good quality input image. The factors that affect the performance of face analysis are the same as the factors affecting face detection, only more restrictive.

- Face direction. It is very important that the face is looking directly at the camera. Both eyes must be visible, and as much of the cheek and jaw bones on both sides of the face should be as visible as possible.
- Face size. The face should be large and form a large proportion of the image.
- Facial expression. Although Media Server can analyze faces with different expressions, facial expressions that cause a larger scale change in face shape (for example, winking or gaping) inhibit demographic classification.
- Lighting. Lighting should be consistent across the face, with no areas of shadow.

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