DH Network Camera
Product Construction Instruction Manual (Passenger Flow Solution)
28
V.
Notes
Stereo Vision Passenger Flow Camera
1. Factors Affecting the Count Rate
Many factors affect the count rate and the important ones are listed as follows.
The smart algorithms occasionally give false alarm, which is proportional to the sensitivity.
The more sensitive, the higher rate of false alarms.
The calibrated height and angle differ from the actual height and angle. In this case,
calibrate several times to eliminate occasional disturbance. Calibrate a large frame as
much as possible to make sure the ground is framed. If abnormal data keeps coming up,
contact Dahua’s after-sale service.
The tracking frame deviates from the objects.
If water mist forms, open the small rear cover beside the camera cable. The high
temperature of the camera can then remove the mist.
The smart algorithms detect much less efficiently under the black and white mode of the
camera, so avoid using the smart algorithms in this mode.
Trolley cases and trailer trucks can be mistakenly counted to lead to count errors.
In the entrance/exit of multiple armed devices, the overlap in the middle can result in wrong
counting (related to the length of the trigger lines between adjacent devices).
Make sure the traces of entrance/exit are complete and free of sudden appearance or
disappearance.
Drastic lighting change is also a source of wrong counting.
Wrong counting takes place if the moving direction of passenger flow is not vertical to the
trigger lines.
