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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
Step 1 Select Setting > Event > IVS > Global Setup.
The Global Setup interface is displayed. See Figure 5-21.
Figure 5-21 Global setup of IVS
Step 2 Set parameters. See Table 5-5.
Table 5-5 Description of global setup (IVS) parameters
Adjust the filter sensitivity. With higher value, it is easier to trigger an
alarm when low-contrast object and small object are captured, and the
false detection rate is higher.
Step 3 Set calibration area and ruler.
1) Click Add Calibration Area and draw a calibration area in the image.
2) Select a calibration type and enter the actual length, and then click Add Rulers.
3) Draw one horizontal ruler and three vertical rulers in the calibration area.
Step 4 Click Save.
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