Detect Region Tracks dialog box
The Detect Region Tracks dialog box is used to detect region tracks in the current scene.
To display the Detect Region Tracks dialog box: On the Scene menu, click Detect Region Tracks.
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Settings
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Description
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Name region track group
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The name for the 3D region track group to be created.
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Track regions of class
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Specify the region class on which region tracks are to be detected.
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Tracking settings
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The parameters that specify how predicted positions are determined and used. See region tracking algorithm for detailed descriptions of their use.
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Variable
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Description
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Alpha
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A filter factor for position estimates.
1 suggests no confidence in position predictions and 0 suggests total confidence. Lower Alpha values are less sensitive to measurement noise, higher Alpha values are more responsive to target movements.
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Beta
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A filter factor for velocity estimates.
1 suggests no confidence in velocity predictions and 0 suggests total confidence. Lower Beta values are less sensitive to measurement noise, higher Beta values are more responsive to target movements.
Velocity is generally more sensitive to noise than position and Beta is generally lower than Alpha.
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Exclusion distance
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The permissible distance (m) between a prediction and an observation.
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Weights
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The parameters that specify how regions are allocated to tracks when more than one track or region is considered at a time. See region tracking algorithm for detailed descriptions of their use.
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Variable
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Description
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Distance in space
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Weight for the distance (m) in space between an observed point and the predicted point.
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Distance in time
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Weight for the time (s) between an observed point and the last point in a track.
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Mean Sv
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Weight for the difference between the Mean Sv (dB re 1m-1) of a region and the mean Sv mean of the regions in a track.
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Volume
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Weight for the difference between the volume (m3) of a region and the mean volume of the regions in a track.
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Notes:
- Weights are relative to one another. You can use any values you like. If one is twice another this will grant that parameter twice the influence of the other in determining region to track allocations.
- These are only used where:
- there are two or more tracks to which a region may be allocated.
- there are two or more regions with exactly the same mean valid time.
- This is unlikely to happen if detected schools are tracked.
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Track Acceptance
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The parameters that specify some constraints with which the resulting 3D region tracks must comply.
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Variable
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Description
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Minimum number of regions in a track
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The minimum number of regions a track must contain.
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Maximum distance gap between regions
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The maximum distance (m) between two points in a track.
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Maximum time gap between regions
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The maximum time (s) between two points in a track.
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See also
About region tracks
About region track detection
Detecting region tracks
Region tracking algorithm