Face detection works properly if cameras are installed and set up as follows:

1. The frame rate should not be less than 12 fps and not less than 6 fps for face recognition at turnstiles.

2. The maximum angle of frontal perspective of the photos of people’s faces received from video cameras should not exceed +/- 15 °. 

3. The distance between the pupils on the photos of people’s faces received from video cameras should not be less than 32 pixels.
4. Mutual faces covering should be minimal.
5. Faces should be evenly illuminated with diffused light of at least 200 lux. Directional side lighting is not allowed.
6. The contrast of the photos of the captured faces should be over 64 grayscale. Insufficient or excessive lighting is not allowed.
7. There should be no backlighting and sharp gradients of light and shade.
8. The photos of the captured faces received from video cameras should be clear. Image blurring caused by motion is not allowed.