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Operation Manual
148
corresponding actual distance.
Applicable Scene
●
Medium or distant view with installation height of more than three meters. Scenes with parallel
view or ceiling-mounted are not supported.
●
Calibrate horizontal plane, not vertical walls or sloping surfaces.
●
This function is not applicable to scenes with distorted view, such as the distorted views captured
by super wide-angle or fisheye camera.
Notes
●
Calibration Drawing
◇
Calibration area: The calibration area drawn should be on one horizontal plane.
◇
Vertical ruler: The bottom of three vertical rulers should be on the same horizontal plane.
Select three reference objects with fixed height in triangular distribution as vertical rulers,
such as vehicle parked at roadside or road lamp poles. Arrange three persons to draw at each
of the three positions in the monitoring scene.
◇
Horizontal ruler: Select reference object with known length on the ground, such as sign on
the road, or use a tape to measure the actual length.
●
Calibration Verification
After setting the ruler, draw a straight line on the image, check the estimated value of the straight
line, and then compare this value with the value measured in the actual scene to verify
calibration accuracy. In case of major difference between the estimated value and the actual one,
fine-tune or reset parameters until the error requirement is met.
Procedure
1. Select
Setting
>
Event
>
IVS
>
Global Setup.
Figure 5-33 Global setup of IVS
2. Set parameters.
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