User manual

85XX Series Network DVR User Manual……………………………………………………………………….V1.0
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In essence, the Alarm Holdoff Time can be configured to prevent multiple alarms being generated because an
object is loitering on the edge of a zone. Without Alarm Holdoff Time configured, this scenario would cause
so-called "Alarm chatter".
The default setting for Alarm Holdoff Time is 5 seconds.
4.4.11.2 Measurement Units
Allows the measurements units to be switched between Metric and Imperial formats. For more information,
please refer to the Measurement Units topic.
4.4.11.3 Metadata Format
The metadata stream contains a complete description of every moving and stationary target, as well as
additional diagnostic data to enable troubleshooting and optimum configuration. In order to save network
bandwidth, the default metadata stream does not include a lot of the diagnostic data. The specific contents of
the metadata stream can be configured with this control.
The metadata stream can contain any selection of the following sub-streams:
4.4.11.4 Event
Contains information about events (alarms) raised due to objects triggering detection rules.
4.4.11.5 Object
Contains detailed information about each and every object tracked by the VCA engine including bounding box,
object trail and object properties.
4.4.11.6 Counting
Contains the values of any counters that have been configured.
4.4.11.7 Blob
Contains the blob-map data. This can be used to show the output of the object detection stage of the VCA
algorithm. Enable this option for advanced performance analysis. For normal use it's recommended to keep
this option disabled due to the increased bandwidth required by the transmission of the blob-map.
4.4.11.8 Tamper Diagnostics
Contains the tamper detection diagnostic data. This can be enabled to show the output of the tamper detection
module. This can be useful when configuring the tamper detection filter. For normal use, this option should be
disabled due to the increased bandwidth required by the transmission of the tamper detection debug data.
4.4.11.9 Counting Line Diagnostics
Contains the counting line diagnostic data. This can be enabled to show the internal operation of the counting
line module. This can be useful when determining the optimum calibration width for a counting line. For more
information about the counting line and the diagnostic data, refer to the Counting Line topic.
4.4.11.10 More Information
For more information about the format of the metadata, please consult the VCAsys Metadata Format Manual.
4.4.11.11 Stationary Object Hold-on Time
The Stationary Object Hold-on Time defines the amount of time that an object will be tracked by the engine
once it becomes stationary. Since objects which become stationary must be "merged" into the scene after
some finite time, the tracking engine will forget about objects that have become stationary after the Stationary
Object Hold-on Time. The default setting is 60 seconds.