Knowledge Base Article
Article Type: Troubleshooting
Product: Symphony
Product Version: 6.5
Component: Analytics Engine
Device Brands:
Created: 29-Aug-2011 5:48:45 PM
Last Updated:

Troubleshooting for the VE150

ProblemReasonFix
False alarmsTrees or reflectionsTry the Dynamic background model (Environment tab).
Rain droplets or insectsKeep the camera lens clean from rain droplets or insects. Rain droplets or insects hitting the camera lens directly will cause false alarms. If a spotlight is installed too close to the camera, it will attract insects.
Wind or vibrations causes the camera to moveThe camera must be stable.
Object stands still in the video for a long time

Track Slow Moving Objects / Object Speed option:

Tracks an object moving very slowly across the video. It can also be an object moving directly toward or directly away from the camera, which will appear to be moving slowly.

If Track Slow Moving Objects is disabled, objects tend to become part of the background and as such will not be tracked. By enabling this option, these objects will be tracked.

Default setting: False

No alarm with fenceThe All Fences option has probably been selectedIf All Fences has been selected, the object must cross through all fences drawn to cause the alarm.
Too many people are countedPerson size calibrated incorrectlyTry decreasing the person size - spatio-temporal cube.
Not enough people are countedPerson size calibrated incorrectlyTry increasing the person size - spatio-temporal cube.
Person classified as shadowPerson wearing dark clothing on light background

The Shadow Sensitivity slider option controls how aggressively shadows (decreases in lighting) are ignored when tracking moving objects.
Increasing the slider (to the right) will allow the video engine to correctly ignore more of the shadow areas.

Default setting: Middle (disabled)

Person classified as an illumination increasePerson wearing light clothing on a dark backgroundThe Illumination Sensitivity slider option controls how aggressively any increase in lighting is ignored. An increase in lighting occurs, for example, when car headlights suddenly appears or when an overcast day becomes a sunny day.
Increasing the slider (to the right) will allow the video engine to correctly ignore any increases in illumination.
Background (versus foreground) not determined correctlyIf an object has a periodic movement with a period greater than the specified time, then that object will always be considered a foreground object (never merged into the background).
The background is determined based on the last Update Background Seconds of video.
The background is updated all the time, not only when the analytics engine starts.

Adjust the Background learning duration (seconds) option.

It determines the approximate length of time it will take a foreground object that becomes stationary to merge into the background.

Default setting: 15

Objects with similar colour as background are not detectedNeed to reset contrast

The Foreground contrast option sets the minimum contrast needed for an object to be detected as a foreground object.
Default setting: Low
If set to a large value, then objects with similar colour as the background will NOT be detected as valid objects to track.

The High contrast threshold option is used to determine how far apart an observation can be from the learnt background model before it is detected as foreground. A low value (for example, 5) will make the background model more sensitive to small changes in the pixel intensities.

Default setting: 25

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