Operation Manual

IVA 4.0 IVA 4.0 | en 45
Bosch Security Systems Operating Manual DOC | 4.0 | 2009.06
Head Detection
1. Activate this option if you wish to use head detection.
Two head outlines, representing the minimum and maximum size of the heads to be
identified, will be displayed in the camera image.
2. Move one of the outlines onto a head that is displayed in the camera image and adapt the
size
or
enter the corresponding values in the input fields.
Avoid false alarms and reduce required computing power by restricting head detection to the
expected head sizes. If the required computing power is too high, heads can no longer be
recognized.
For further details on using head detection as a filter in tasks, please see: Section Final Step -
Define the Head Detection Conditions, page 29.
Notes on Finding Heads
An object is recognized as an object with a head if a shape resembling a head with colors that
resemble human skin is detected. Head detection is only possible using a color camera. Heads
will not be detected if the colors have been severely tampered with.
The best way to detect heads is if the camera captures them from the front and slightly from
above. For optimum results, the height of the head should be approximately 10% of the height
of the image. Individuals wearing large headdresses or that are only captured from the side
will not be recognized as an object with a head.
Functions
– Idle object detection
Idle objects can only be detected if this option is activated.
An idle object is an object that was detected as an object based on an initial movement.
The object is then classed as idle if it does not move for the time span entered under
Debounce time [s].
– Debounce time [s]
Enter the time span in seconds for which an object must remain idle in order to be
classed as such.
– Removed object detection
Removed objects can only be detected if this option is activated.
An object is assumed to have been removed if changes are detected in the background
following movement within an image.
– Image stabilization
If you activate this option, the movement of the image (strictly speaking, the camera) is
compensated by up to 2% of the image size.
Activate this option if the camera is mounted on an oscillating mast, for example.
– FIR camera
If you make these settings for a Far Infrared camera (FIR), activate this option so that
objects can be correctly detected.