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AUTODOME IP starlight 5100i IR
6.1.2
Positioning
The Positioning feature describes the location of the camera and the perspective in the
camera's field of view.
Perspective information is essential to Video Analytics, as it enables the system to compensate
for the illusory smallness of distant objects.
Only through use of perspective information is it possible to distinguish objects such as
persons, bicycles, cars and trucks, and accurately compute their real size and speeds as they
move through 3D space.
However, to calculate perspective information accurately, the camera must be directed at a
single, flat horizontal plane. Multiple and inclined planes, hills, stairs can falsify perspective
information and produce incorrect object information such as size and speed.
Mounting position
The mounting position describes the perspective information that is also often called
calibration.
In general, the mounting position is determined by the parameters of the camera such as
height, roll angle, tilt angle, and focal length.
The height of the camera must always be entered manually. Whenever possible, roll angle and
tilt angle are provided by the camera itself. The focal length is provided, if the camera has a
built-in lens.
Select the appropriate mounting position of the camera. Options that appear depend on the
type of camera.
Height [m]
The height describes the vertical distance from the camera to the ground plane of the
captured image. Typically the elevation of the mounted camera above the ground.
Enter the height in meters of the position of the camera.
Coordinate system
The Coordinate system feature describes the position of the camera in a local Cartesian or
the global WGS 84 coordinate system. The camera and the objects tracked by the video
analytics are displayed on a map.
Select the coordinate system and enter the appropriate values in the additional input fields
that appear depending on the coordinate system selected.
Cartesian
The Cartesian coordinate system describes each point in the space by a combination of the
position on three orthogonal axes X, Y and Z. A right-handed coordinate system is used, where
X and Y span the ground plane and Z describes the elevation of the ground plane.
X [m]
The location of the camera on the ground on the X-axis.
Y [m]
The location of the camera on the ground on the Y-axis.
Z [m]
The elevation of the ground plane. To determine the elevation of the camera, add the Z [m]
value and the Height [m] value of the camera.
WGS 84
The WGS 84 coordinate system is a spherical coordinate system description of the world and
used in many standards including GPS.
Latitude
Latitude is the north-south position of the camera in the spherical coordinate system WGS 84.
Bosch Security Systems
User Manual
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2023-01 | 1.2 |
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