Sony SNC-EMX Serie Manuel D'utilisation page 65

66 en | Configuration
The flatter the tilt angle is set, the less accurate the estimate of object sizes and speeds will
be. The settings must be between 0° and 90°. Estimates are no longer possible when you have
reached 0°.
Roll angle [°]
Enter the roll angle if the value is not determined by the camera.
The roll angle describes the angle between the roll axis and the horizontal plane. The angle
can deviate from the horizontal by up to 45°.
Height [m]
Enter the height in meters of the position of the camera.
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.
Focal length [mm]
(Only applicable to SNC-EMX cameras)
Enter the focal length in millimeters of the position of the camera if the value is not
determined by the camera.
The focal length is determined by the lens. The shorter the focal length, the wider the field of
view. The longer the focal length, the narrower the field of view and the higher the
magnification.
Show sensor values...
(Only applicable to SNC-EMX cameras)
Click to automatically see the camera parameters, for example, Tilt angle [°], Roll angle
[°]and Focal length. These calibration values are measured by the device sensors. Click 'OK'
to transfer them to the Positioning settings page.
Sketch
(Only applicable to SNC-EMX cameras)
Click to improve the automatic calibration. The Sketch Calibration window is displayed.
The Sketch functionality offers an additional, half-automatic calibration method. This
calibration method allows you to describe the perspective in the camera's field of view by
drawing vertical lines, ground lines, and ground angles in the camera image and entering the
correct size and angle. Use the Sketch functionality if the result of the automatic calibration is
not sufficient.
You can also combine this manual calibration with the values for roll angle, tilt angle, height
and focal length calculated by the camera or entered manually.
Select the Calculate check box to obtain the roll angle, tilt angle, height and focal length from
the sketched calibration elements - vertical lines, ground lines and angles - you have placed in
the camera.
Clear the Calculate check box to enter a value manually or to refresh to the values provided by
the camera itself.
Calibrating cameras using the Sketch Calibration window
To determine non-automatically set values:
1.
2019-07 | V01 | DOC
Enter the value for tilt angle, roll angle, height and focal length if the value is known, for
example, by measuring the height of the camera above the ground, or reading the focal
length from the lens.
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