You can define the areas from which you want detected changes to trigger
events.
What you should know
You can enable the following options to visualize the sensitivity of your configuration:
- Show scene background
- Detected differences from the learned background are highlighted in blue if they are
minor, in green if they are moderate, or in red if they are severe.
- Show detection grid
- Displays the analysis blocks that make up the defined area. A block outlined in red
indicates the block is active.
NOTE:
Depending on which scenario type you are configuring, some
settings might be unavailable or hidden if Advanced mode
is
disabled.
Procedure
-
From the Config Tool homepage,
open the Video task.
-
From the area view, select a camera that you applied an analytics scenario
to.
-
Click , and then click the scenario you want to configure.
-
Click the Areas tab.
-
Define the area as required:
-
Click and drag the area to move it to the location you want.
-
Click and drag the white dots to adjust the shape and size of the
area.
-
(Optional) Add or remove areas.
-
In the Area name field, rename the selected area.
-
In the Detection section, configure the following
settings:
- Foreground detection tolerance
- The sensitivity of change detection. If set too high, differences from the background
you want detected might not get detected. If set too low, the slightest changes are
detected and might cause false alerts.
- Min. foreground per block
- The portion of a block that must differ from the learned background enough for the
block to be considered foreground.
- Detection time
- The duration that a block must be detected as foreground to be considered active. The
Detection time countdown begins when the specified
Stationary object time period ends. This setting is used to
minimize false alerts caused by rapid changes in a block, such as moving shadows.
When
Show detection grid is enabled, Detection
time is represented by the bottom of the blocks where an object is
detected turning red.
- Activity cooldown
- The duration that a block remains active after it is no longer detected as
foreground.
When Show detection grid is enabled,
Activity cooldown is represented by the blocks outlined in
grey. The bottom of the blocks turn red.
-
In the Object size section, configure the following
settings:
- Min. blocks per object
- The minimum number of active blocks required for an alert to be triggered.
- Max. blocks per object
- The maximum number of active blocks required for an alert to be triggered.
- Detect all active blocks
- When this option is selected, active blocks anywhere in the defined area can trigger
alerts.
- Detect only connected blocks
- When this option is selected, only active blocks that are adjacent to each other can
trigger alerts. This option minimizes false alerts caused by scattered movement, such as
camera noise.
-
Click Apply.
Example
The
following examples show the stages leading up to an alert. In these examples, the motion
analysis mode is set to
Detect stationary objects.
Detection
time
The following image shows that an object is detected, and the
Detection time is counting down. This countdown is
indicated by the bottom of the analysis blocks turning red from left to
right.
Active blocks
The following image shows that the blocks
are active; they are outlined in red.