User Manual

IVA 4.0 IVA 4.0 | en 39
Bosch Security Systems Operating Manual DOC | 4.0 | 2009.06
– Section 4.7.2 Global Settings, page 44
– Section 4.7.3 Sensitive Area, page 46
The settings and values defined here are valid for all tasks.
4.7.1 Calibration
Calibration is necessary for specifying the relationship between the camera image and the
real-life environment. Areas and speeds can be correctly interpreted after the camera angle,
camera elevation and distance are entered.
Calibration is required primarily so that the speed and size of detected objects or the radius
of movement for loitering persons are correctly interpreted.
With a VG4 AutoDome, calibration must be completed for each preset.
If you select the Calibration tab, the parameters with the currently set values are displayed on
the right-hand side of the window.
IVA 4.0 allows two types of calibration:
– Section Calibrating with Calibration Elements, page 39
– Section Calibrating with Calibration Plane, page 42
Switch between the calibration types by clicking one of the buttons:
The system must be recalibrated each time the camera position is changed.
Calibrating with Calibration Elements
The calibration is defined by placing several calibration elements (lines and angles) on the
camera image and adjusting these step by step in relation to the actual situation.
1. In the Camera section, enter all the values you know regarding the camera and its
positioning:
– Activate the Fixed option in each case.
– Then enter the corresponding value.
NOTICE!
The unit of measurement display can be adapted so that when the English language user
interface is used, the relevant "imperial measurements" used in the English-speaking world are
displayed (see: Section 7 Display of Units of Measurement, page 59).
Tilt angle [°] The angle between the horizontal and the camera.
The flatter the tilt angle is set, the less accurate the
estimate of object sizes will be. Estimates are no longer
possible when you have reached 0°.
Roll angle [°] The angle by which the camera is tilted.
The setting can deviate from the horizontal by up to 10
degrees.
Elevation [m] The vertical distance from the camera to the ground plane
of the captured image – typically the elevation of the
mounted camera above the ground.