Operation Manual

32 en | IVA 4.0 IVA 4.0
DOC | 4.0 | 2009.06 Operating Manual Bosch Security Systems
Final Step - Define the Head Detection Conditions
In this step, you define whether an alarm should be triggered according to whether or not
detected objects have a head. This enables you to set the surveillance to focus on people or
exclude them completely.
These settings are described here: Section Final Step - Define the Head Detection Conditions,
page 29.
4.5.5 Condition change
This task generates an alarm event if one of the following properties changes for a detected
object within a specified time span:
– Size
– Aspect ratio
–Speed
–Direction
First Step - Define the Initial Conditions
Define individual properties, such as the size, aspect ratio, speed and direction, that an object
must have in its initial condition for it to be detected.
These settings are described here: Section Next Step - Define the Conditions, page 25.
Next Step - Define the Trigger
For the properties defined in the previous step, specify which values will trigger an alarm
event.
These settings are described here: Section Next Step - Define the Conditions, page 25.
Next Step - Define the Time Span
Here you can limit the time span in which the change in the selected properties takes place.
1. Activate the option.
2. Enter a minimum and maximum value in seconds.
The time span will only be analyzed when you activate this option. If this option is not
activated, respective changes in an object property will trigger an alarm event regardless of
the length of time that has passed.
Next Step - Define the Field
You can limit the detection of changes to a specific area. The area is defined by a field in the
camera image.
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
object has moved or been within the field for the specified period at least.
By entering a value, you can prevent the triggering of multiple alarm events by objects
that are constantly moving toward and away from the boundary of the field.
NOTICE!
Only activate the properties that should be analyzed for this task.
If you activate multiple properties, then all of these object properties must change for an
alarm event to be triggered (logical connective = AND).
If an alarm is to be triggered when multiple properties are changed independently of one
another, you must only create one dedicated task for each of these properties.