Passive Liveness Detection has the following features.
The liveness check is performed by the face engine before feature extraction. If fails to qualify as "live", the features are not extracted.
Only one face should be visible
Colored images are required
10 frames per second or better frame rate required
Better score is achieved when users do not move at all
80 pixels is the recommended minimal distance between eyes (IOD) for a reliable performance (100 pixels or more recommended for smoother performance)
Analyzes certain facial features while the user stays still in front of the camera for a short period of time
The face should be still and the user has to look directly at the camera with ±15 degrees tolerances for roll, pitch and yaw to experience the best performance.