(requires: Advanced 2D Tracking)
If you have this module enabled in HASP, the Object tracking module gets extended with several advanced features.
Please see also the Binary Tracking Step by Step section.
Object Tracking
Figure 1598. Object Tracking Window
Select which options apply to the tracking.
The algorithm tracks binary objects instead of the detected ROIs. Press this button to perform the tracking.
Other Object Tracking options are closely described here: Tracking Options.
Track Properties
Figure 1599. Track Properties window
The track has the same color as the object (or ROI). Select the Show tail option to indicate current direction of the motion. Specify how many segments of the trajectory are used. The Show centroids option displays crosses over the current centroid position.
Color of the track changes according to the speed at a particular position.
The track color changes steadily from the beginning to the end.
The colors are used relatively to the duration of the entire image sequence.
The colors are used relatively to the duration of each track.
When selected, all detected tracks are displayed on all image frames. Otherwise, only the tracks corresponding to currently visible objects are displayed.
Check this item to display area of probable next movement predicted by the tracking algorithm.
The predicted movement is depicted as a circle described by the Standard Deviation Multiplication Factor (see description here: Tracking Options).
By checking this option, only binary objects which are selected by mouse within the list of objects are displayed. Other binary objects (and their tracks) remain hidden.
Note
This works only with binary objects. ROIs can not be hidden.
Use this option to hide trajectories of objects which are not currently selected.
Set the percentage of unselected tracks transparency.
Check this item to display the trajectory always only to the current frame.
Check this item to display vector of speed either in every point of the trajectory, only on the current point, or from begin to end. Define the Vector arrow scale in pixels corresponding to Ξm per second.
Advanced tracking contains additional Track processing options. Track processing operates on whole tracks. These tracks are built during the frame-to-frame linking phase defined by Object Tracking and Object Features settings. This is an additional phase that allows further improvement of the tracking results. Summary data obtained by track processing features are shown in the Tracks tab.
Note
Track processing is available for binary tracking only. Results of track processing features are shown in the Tracks tab inside the Tracking panel.
Figure 1600. Tracking Options Window
Track processing
Contrariwise to the Object features tab, these options are track-oriented.
If an object is detected tracked in less frames than the defined value, the whole track will be deleted.
This option can effectively filter objects which are moving e.g. on the spot (in circles). Line speed of the whole track is taken.
See also Line Length and Speed.
A tracked object can sometimes disappear so that it cannot be tracked within certain number of image frames. When it reappears, the track can be re-connected to the original. Select how many frames can be omitted at most.
See Standard Deviation Multiplication Factor (Tracking Options).
Note
This option is available only if the Allow New Tracks After First Frame option is enabled.
Choose whether a track may split. Specify the probability factor - a number which multiplies the probability of occurrence of a splitting track.
Note
This option is available only if the Allow New Tracks After First Frame option is enabled.
The tabs embedded into the Tracking panel show summary information for one track, a selection of tracks or for all tracks created by advanced tracking.
The Graph tab displays speed of the objects on Y axis with time value on the X axis by default. More variables can be selected from the Left and Right combo boxes. Data tab displays total information for each frame of the ND2 file.
Tracks tab displays overall information related to tracks. Performed operations from the Track Processing tab (Tracking Options window) are shown here.
Column sorting is available in the Data and Tracks view. All gathered data can be filtered multiple times by any variable measured during the object tracking. E.g. tracks can be sorted by heading to display only tracks with heading from 0 to 180 degrees.
Figure 1601.
Color as parent Objects are colored as their parent.
Color as branch Objects are colored based on their branch.
View as Tree Objects are displayed in a tree view.
View as List Objects are displayed in a list view.
Delete object Deletes the selected object(s).
Delete all objects Deletes all objects present in the object list.
Binary to ROI This button converts binaries into ROIs.
In this section you can select which variables will be displayed in the graph.
Update Tracking Features This button updates the tracking features.
Show Statistics Shows the tracking statistics in the Tracks tab.
Use filter Filters the tracking results using the defined filter.
Define Filter Is used to define, edit and manage filters which can be applied by the Use Filter button.
Turns on/off the stage movement correction eliminating measurement inaccuracies caused by the stage.
Delete trajectory to current frame (ROI) Trajectory of the selected object(s) is deleted to the current frame.
Delete trajectory from current frame (ROI) Trajectory of the selected object(s) is deleted from the current frame.
Delete current tracking point (ROI) Deletes the current tracking point.
Delete All Tracking points (ROI) Deletes all tracking points.
Context menu over tracked objects
Highlights the selected object.
Only frames where the object is present are selected.
Selects all tracked objects.
Deselect all tracked objects.
Inverts the object selection.
Converts selected binary tracks into ROI.
Copies selected binary tracks into a new binary layer.
Moves selected binary tracks into a new binary layer.
Copies untracked objects into a new binary layer.
Moves untracked objects into a new binary layer.
Deletes the selected object(s).
Keeps the selected object(s).
Puts a color bookmark next to the name of the object.
Removes the bookmark of the selected object(s).
Removes all bookmarks present in the object list.
Bookmark is removed from objects already bookmarked and is added to those not being bookmarked yet.
Selected object is used as a reference object (e.g. for distance measuring).
Renames the selected ROI.
Opens the Align Current ND Document dialog window (see: Image > ND Processing > Align Current ND Document).
Opens the Annotation Properties dialog window used to define an annotation (arrow with text) which is added to each tracked object. Select where the arrow will point on each object (Insert to Position Calculated by Objects) and set the space between the arrow head and the object (Position Offset). Choose the arrow pointing angle (Select Arrow Angle) and adjust the text and arrow properties (Properties...). All the dialog settings can be saved into a preset (Save As Preset) and loaded at any time by selecting the preset name in the Preset combo box.