G4L
User Manual
P a g e
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Copyright©2020 ZKTECO CO., LTD. All rights reserved.
1:1 Threshold Value
Under 1:1 verification mode, the verification will only be successful when the
similarity between the acquired facial image and the user’s facial templates
enrolled in the device is greater than the set value.
The valid value ranges from 55 to 120. The higher the thresholds, the lower the
misjudgment rate, the higher the rejection rate, and vice versa. It is
recommended to set the default value of 63.
Enrollment
Threshold Value
During face enrollment, 1:N comparison is used to determine whether the user
has already registered before.
When the similarity between the acquired facial image and all registered facial
templates is greater than this threshold value, it indicates that the face has
already been registered.
Face Pitch Angle
The pitch angle tolerance of a face for facial registration and comparison.
If a face’s pitch angle exceeds this set value, it will be filtered by the algorithm,
i.e. ignored by the terminal thus no registration and comparison interface will be
triggered.
Face Rotation
Angle
The rotation angle tolerance of a face for facial template registration and
comparison.
If a face’s rotation angle exceeds this set value, it will be filtered by the
algorithm, i.e. ignored by the terminal thus no registration and comparison
interface will be triggered.
Image Quality
Image quality for facial registration and comparison. The higher the value, the
clearer the image requires.
Minimum
Recognition Value
Required for facial registration and comparison.
If the minimum size of the captured figure is smaller than this set value, then it
will be filtered off and will not be recognized as a face.
This value can be understood as the face comparison distance. The farther the
person is, the smaller the face is, and the smaller the face pixel will be obtained
by the algorithm. Therefore, adjusting this parameter can adjust the furthest
comparison distance of faces. When the value is set to 0, the face comparison
distance is not limited.
LED Light Trigger
Value
This value controls the on and off of the LED light. The larger the value, the more
frequently the LED light will be turned on.
Motion Detection
Sensitivity
It is to set the value for the amount of change in the camera’s field of view,
which is known as potential motion detection value, that wakes up the terminal
from standby to the comparison interface.
The larger the value is, the more sensitive the system would be, i.e. if a larger
value is set, the comparison interface is much easier and the motion detection is
frequently triggered.
Live Detection
Detecting the spoof attempt using visible light images to determine if the
provided biometric source sample is really a person ( a live human being) or
false representation.
Live Detection
Threshold Value
Facilitates to judge whether the captured visible image is really a person (a live
human being). The larger the value, the better the anti-spoofing performance
using visible light.
