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

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

2. The maximum angle of

   incidence

   frontal perspective of the photos of people’s faces received from video cameras should not exceed +/-

   15 ° off the ground level.

   15°. 

3. The distance between the Distance between pupils on the received photos of face must be not  people’s faces received from video cameras should not be less than 32 pixels.
4. There Mutual faces covering should be minimum mutual overshadowing of the captured facesminimal.
5. The faces Faces should be evenly illuminated with a diffused light of at least 200 lux. Directional side lighting is not allowed.
6. The sharpness contrast of the photos of the captured faces on the received photos must should be over 64 grayscale. Deficient Insufficient or exceeding illumination excessive lighting is not allowed.
7. There should be no back light 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.