Verint Nextiva S1700e Series Podręcznik Użytkownika Strona 92

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H: Motion Track
76 Verint Video Solutions
Sensitivity Settings
Use the Sensitivity tab to adjust the sensitivity of the DVMD module and set several target
selection attributes.
ContrastThe range of colors in each of the cells. Increasing the contrast raises the
dynamic threshold, makes DVMD less sensitive to nuisance alarms and lowers the
probability of detection.
Noise video sources, such as light-intensified cameras and infrared cameras, can have
high variability. Video from outdoor cameras contains more variance than that from
indoor scenes, because of variations in lighting. In noisier environments, the local
contrast should be as high as possible while still detecting low-contrast targets.
Filter Rates—Default value provided by the supplier.
Target Selection—To set various alarm values:
Alarm Duration—The number of seconds an alarm remains on after DVMD has
identified a target and initiated an alarm as a result. The range of values is 0–300
seconds.
Minimum Age—The number of video frames that a target must be tracked before
DVMD generates an alarm. The higher the number, the longer a target must be
tracked before causing an alarm. The longer a target is tracked, the more certain
the system is that the alarm is valid; however, this will program a delay or lag in
the reaction time of the DVMD module.
The range of values is 0–300 frames. The default setting of 30 requires targets to
be tracked continuously for one second with NTSC cameras (the default for PAL
cameras is 25).
Minimum Move—The number of cells through which a target must move before it
generates an alarm. The range of values is 0–30 cells. To eliminate alarms on
stationary objects that have some changes (such as a flashing neon sign), make
sure this setting is greater than 0. A setting of 0 increases the system’s ability to
detect slow-moving or intermittent targets.
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