Chapter 10: Camera setup
TruVision NVR 11 User Manual
81
VCA event types
Description
Cross Line Detection
Use this function to detect people, vehicles, and objects crossing a
pre-defined line or an area on-screen. The line crossing direction is
set as bidirectional only. Bidirectional is crossing the line from both
directions. Only one cross line is supported.
Intrusion Detection
Use this function to set up an area in the surveillance scene to
detect when intrusion occurs. If someone enters the area, a set of
alarm actions can be triggered.
Object Left Behind Detection
Use this function to detect objects left in the designated region
such as baggage, a purse, dangerous materials, etc.
Object Removed Detection
Use this function to detect objects removed from a designated
region, such as exhibits on display.
Enter Region Detection
Use this function to detect people, vehicle, or other objects that
enter a designated region from outside the designated region.
This function can only be defined via the browser.
Exit Region Detection
Use this function to detect people, vehicle, or other objects that exit
from a designated region, and certain actions can be configured to
occur when the alarm is triggered.
This function can only be defined via the browser.
Defocus Detection
Use this function to detect image blur caused by defocusing of the
lens, triggering a series of alarm actions.
The sensitivity level determines how much blur is tolerated by the
camera before triggering an alarm. When enabled, the camera
regularly checks the level of image focus (to allow for variations in
light during the day) and then compares the current image to that
of the reference image to see if there is a difference. A high
sensitivity level means that there cannot be a large variance
between the reference and current image.
This function can only be defined via the browser.
Sudden Scene Change
Use this function to configure the camera to trigger an alarm when
the camera detects a change in the scene caused by a physical
repositioning of the camera.
This function can only be defined via the browser.
Audio Input Exception
Use this function to detect sounds that are above a selected
threshold.
You can set it to detect a sudden rise and/or fall in sound intensity.
The smaller the sensitivity level set, the larger the change in sound
needs to be to trigger detection. The sound intensity threshold
filters the sound in the environment. The louder the environmental
sound, the higher the value.
This function can only be defined via the browser.
To setup VCA alarm actions via the OSD:
1. From the menu toolbar, click
Camera Setup
>
VCA
.
2. Select the camera for which to set up the VCA alarm.
3. Select the
Enable VCA Alarm
checkbox to enable the feature.