Detecting region tracks

Before you begin

See About region track detection for an overview before detecting region tracks.

You will need to create the 3D regions you will track. You can create these from multibeam data by detecting schools.

Detect region tracks

 To detect region tracks in a scene:

1. Display the region class of interest in the scene.
2. On the Scene menu, click Detect Region Tracks.
3. The dialog box may appear with the following message:
   
   "There is no analysis variable and associated integration algorithm set for this scene. Echoview will track region geometric centers instead of centers of mass."
   
   If so,
   1. Click OK to track region geometric centers.
      
      - OR -
   1. Click Cancel.
   2. On the Shortcut menu (right-click), click Scene properties.
   3. Click the Analysis tab.
   4. In the Analysis variable list, select an analysis variable.
   5. Click OK.
   6. On the Scene menu, click Detect Region Tracks.

4. On the Detect region tracks dialog box:
   1. Enter a Name for the Name of the region track group.
   2. In the Track regions of class list, select a region class.
   3. Enter the required Tracking settings.
   4. Enter the required Weights.
   5. Enter the required Track Acceptance settings.
   6. Click Detect.

If your detection is unsuccessful, reassess the settings you entered on the Detect region tracks dialog.

Notes:

• See Region tracking algorithm for a detailed explanation of how the settings on the Detect Region Tracks dialog box are used.
• Each detection on a region class will produce a region track group which contains the region tracks detected. Multiple detections (on different classes or using different settings) will produce multiple region track groups.
• To see information about individual 3D regions, see the (3D Object) Properties dialog box.
• If tracking centers of mass, an integration is performed using the algorithm selected on the Analysis page of the Scene Properties dialog box.
• Alpha and Beta express the unpredictability of changes in position and velocity of the point. They can take on values between 0 and 1. A high value indicates that you expect the movement to be more predictable, a low value is less responsive to noise in the signal.
• Use relaxed track acceptance values, and later tune the detection to tighter values.
• Viewing the motion of schools in the scene may give you visual clues on relative size and movement. This may be helpful in tuning the settings for the detection of multiple tracks.

See also

About school track detection
Region tracking algorithm
Detect Region Tracks dialog box
About region tracks
About 3D school detection