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AXIS Perimeter Defender
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Person sticks
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Vertical lines (V-lines)
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Parallel horizontal lines (H-lines)
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Grid and avatar tools
Number of calibration elements
Generally, when you add person sticks, H-lines and V-lines in the scene, the more the better. The calibration engine can calibrate with
very few lines, but typically the calibration quality gets better the more lines and sticks you draw. When you add person sticks, we
recommend that you place them both near and far, left and right.
Vertical structures in the image
According to Recommendations when mounting the camera on page 13, all cameras must point slightly downwards. As a result, all
vertical structures in the real world seem to fan out like a peacock-tail in the image. This means that all person sticks and V-lines
should tilt towards the edge of the image. A stick on the right half of the image should lean to the right and a stick on the left should
lean to the left. At least one of the placed person sticks or V-lines must be “correctly leaning” for the calibration to work.
The precision indicator provides visual feedback on the level and quality of detail that has been added to the scene. For successful
manual calibrations, mark-ups should cover the scene from front to back and from left to right. This is indicated by a green
precision indicator.
Calibration quality
The quality of the calibration can be checked with the grid or avatar manipulators. See Verify the quality of the calibration on page
20. Alternatively, click Review. This shows you the result of running AXIS Perimeter Defender on the captured video using the
current manual calibration.
Calibrate - PTZ Autotracking
Important
To achieve good results, the calibration must be of high quality. Follow the guidelines and instructions carefully.
Note
You can calibrate both cameras at the same time, or one at a time.
1. Select both the xed camera and the PTZ camera.
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