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AXIS Perimeter Defender
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Recommendations when mounting the camera
An appropriately mounted camera.
1
Tilt
2
Field of view elevation
3
Field of view distance
4
Maximum detection distance
5
Minimum detection distance
6
Camera height
7
Detection zone
Object height at the maximum detection distance - For a standing person to be detected at the maximum detection distance, the
pixel height must be at least 5% of the total image height (3.5% for thermal cameras). For example, if the height of the visualized
image is 576 pixels, the height of a person standing at the end of the detection zone must be at least 28 pixels (20 pixels for thermal).
Object height at the minimum detection distance - For a standing person to be detected at the minimum detection distance, the
pixel height cannot be more than 60% of the total image height.
Tilt angle - The camera must be sufciently oriented towards the ground so that the center of the image is under the horizon
line. Mount the camera so that the minimum detection distance is longer than half of the camera’s mounting height (minimum
detection distance > camera mounting height / 2).
Roll angle - The roll angle of the camera must be nearly equal to zero.
1
Object height, tilt angle, and roll angle are suitable.
2
Object height at maximum detection distance is less than 5% of the image height (3.5% for thermal cameras).
3
The center of the image is above the horizon line.
4
The roll angle of the camera is not nearly equal to zero.
The maximum detection distance depends on:
• Camera type
• Camera lens. A higher focal range allows for a longer detection distance.
13
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