Operation Manual

IVA 4.0 IVA 4.0 Flow | en 55
Bosch Security Systems Operating Manual DOC | 4.0 | 2009.06
An activity that is to trigger an alarm event can be restricted. Change the values if you do not
want a particularly low or high activity to trigger an alarm.
1. Activate this option if you wish to filter flows based on their activity.
2. Enter a minimum and a maximum value for the activity.
The selected values are displayed on the camera image during input by a respectively high
number of yellow dots. The number of arrows indicating the detected flow is directly
proportional to the activity in the area.
Speed
The speed of the flow that is to trigger an alarm event can be restricted. As the camera is not
calibrated to detect flows, no definitive indication of the speed can be provided. Flow speeds
are indicated in relation to the background and/or other movements.
Change the values if you do not want a particularly low or high speed to trigger an alarm.
1. Activate this option if you wish to filter flows based on their speed.
2. For the lowest speed Min., choose between Slow, Medium and Fast.
3. For the highest speed Max., again choose between Slow, Medium and Fast.
The selected speeds are indicated by two moving dots on the camera image.
4. Move or rotate this field with the mouse and place it over an area with a flow. This will
enable you to align the flow speed with the selected settings.
5.4.4 Counterflow in field
This task generates an alarm event if a flow moving against a detected overall movement
(main flow) is detected within a certain area. This means that an overall, potentially changing,
movement is detected, and only flows that go against this direction of movement trigger the
alarm.
First Step - Define the Field
1. Select one of the fields.
To do this, use the list field or click a field in the camera image.
You can also create a new field, edit an existing one or select Whole screen.
2. Debounce time [s]
If a value other than 0 (zero) is selected, the alarm event will not be generated until the
flow is detected within the field for at least the specified period.
Final Step - Define the Counterflow
Here you can precisely limit the properties of a counterflow that triggers an alarm event.
Angle of tolerance for counterflow [°]:
The general direction of movement is automatically recognized as the main flow. Only flows
moving in the opposite direction will trigger an alarm event. The maximum deviation of the
movement against the main flow is determined by entering an angle. Angles between 0° and
180° are valid.
By selecting 0°, the direction of movement is restricted in such a way that any counter
movement will not be detected, while selecting 180° will ensure that every movement is
detected.