FACE ENGINE SPECIFICATIONS AND RECOMMENDATIONS
General recommendations for facial recognition:
The face recognition engine has certain tolerance to face posture:
±15 degrees default value is the fastest setting which is usually sufficient for most near-frontal face images.
The head pitch tolerance can be increased up to ±25 degrees if several views of the same face that covered different pitch angles were used during enrollment.
Smaller yaw tolerance values are not recommended to be used except if the target system does not meet the system requirements.
Several views of the same face can be enrolled to the database to cover the whole ±90 degrees yaw range from frontal position.
Face liveness check:
Active ? the engine requests the user to perform certain actions like blinking or moving one's head. All requested actions should be performed to pass the liveness check. This mode can work with both colored and grayscale images. 5 frames per second or better frame rate required.
Passive ? the engine analyzes certain facial features while the user stays still in front of the camera for a short period of time. Colored images are required for this mode. 10 frames per second or better frame rate is required. Better score is achieved when users do not move at all.
Passive + Blink ? the engine analyzes certain facial features while the user stays still in front of the camera for a short period of time, when the engine requests the user to blink. Colored images are required for this mode. 10 frames per second or higher frame rate required.
Passive then active ? the engine first tries the passive liveness check, and if it fails, tries the active check. This mode requires colored images.
Simple ? the engine requires user to turn head from side to side while looking at camera. This mode can work with both colored and grayscale images. 5 frames per second or better frame rate recommended.
Single frame passive ? the engine uses a neural network to estimate if a face image is not inserted in front of a camera using a paper photo or smartphone screen. This mode does not need any interaction from the user.