Aivia Software

Track display

Tracks are objects that are linked over time; tracks contain information about an object's positions throughout its lifetime. Track objects can be generated by applying one of the tracking recipes available in Aivia. Tracks have four (4) different types of overlays that can be toggled individually.

This page covers display options that are specific to tracks. General information on displaying object sets can be found on the Object Set Settings page.


An example of how object groups that are of the track type appear in the Object Set Settings panel is shown below.

The option to select a rendering mode in the View column is only available for tracks with 3D objects. 2D tracks also do not have the Alpha column.

On this page:

Overlay types

There are four (4) overlays for track display:

  • Objects, which can be outlines in 2D or meshes in 3D
  • Tracks, which indicate the current and previous positions of the tracked objects in the form of lines
  • Anchors, which show the positions (centroids) of the objects on the current and, optionally, previous frames
  • Trends, which show the general headings of tracks between specified points in time

Each overlay has different settings that can be adjusted and toggled independently. Below are examples of the different types of track overlays (click on an image to expand it).


Object display

Tracks in Aivia are associated with objects that are related in time. Objects can be either outlines (in 2D) or meshes (in 3D). Objects are visible only in their respective views, depending on whether the dataset is 2D or 3D. Below are examples of how objects are displayed (along with tracks and anchors) for 2D and 3D datasets.

Objects in 2DObjects in 3D

Rendering modes

If you have 3D objects tracked over time, you can specify the rendering mode for the object meshes in 3D View by clicking on the icon in the View column for the object group and then selecting the mode from the menu that opens. There are three (3) rendering modes for meshes:

Rendering ModeIconDescription
Solid Surface

Renders meshes as solid, closed surfaces

Renders meshes as sets of connected line segments

Renders meshes as point clouds

Once a new rendering mode is selected, the displayed object sets are refreshed automatically to reflect the new selection.

Depending on your hardware, the size of the image, and the rendering mode chosen, it may take Aivia up to several minutes to fully render the display with the specified settings.

A comparison between the three (3) rendering-mode displays is shown below (click on an image to enlarge it).

Solid SurfaceWireframePoints

Rendering-mode options

Track display

A track is a line representation of an object's position over time. As you progress to the next time point, a short segment is appended to the display, indicating the movement of the object from its previous position to its new position on the current frame. Options for track display are given in the table below.

Set Track Length

Specifies the number of frames to display with the track overlay; a longer track length may result in reduced performance
Set Overlay Radius

Specifies the width of the track display
Show/Hide Track Labels

Shows/Hides track labels in Main View (2D)

You can drag the Set Track Length slider or use the adjacent textbox to adjust the maximum number of frames included in the track display. 

When you click on the Set Overlay Radius icon, a slider and textbox pop up underneath the icon. You can use the slider, textbox, or up and down arrows to adjust the radius. Press Enter to confirm changes made in the textbox. It make take a short amount of time for the track display to update, depending on the number of tracks that are visible on the image.

Anchor display

Anchors show the position of the tracked object's centroid. The anchor display is updated each time when you progress to another time point. There are two (2) adjustments that are available for anchor display:

Set Overlay Radius

Specifies the radius of the anchor display
Select Anchor Display Mode

Specifies the display style of the anchor overlay

Same as the tracks display, you can adjust the radiusof the anchor circle (2D) or sphere (3D) by clicking on the Set Overlay Radius icon and using the sliders to specify a value.

In the View column, there are two (2) options for anchor displays:

NameIconDescriptionExample (Click to enlarge)



Shows an anchor only for the current track position


Shows all anchors on the displayed portion of the track

Trend display

Trends show the general directions the tracks travel. Trends are displayed as arrows pointing from the initial position to the terminal position (depending on trend display mode). Trends are updated when you progress to the next time point. There are two (2) adjustments that are available for trend display:

Set Overlay Radius

Specifies the width of the trend arrow
Set Trend Display Mode

Specifies the trend display mode

Same as the tracks display, you can adjust the size and thickness of the trend arrow by clicking on the Set Overlay Radius icon and using the sliders to specify a value.

In the View column, there are three (3) options for trend displays:

NameIconDescriptionExample (click to enlarge)

Full Track


Shows the trend from the track's initial position to its terminal position

First To Current

Shows the trend from the track's initial position to its current position

Only Visible

Shows the trend from the track's position at the earliest displayed time point to its current position

Coloring options

You can specify the coloring mode for each track overlay separately. The coloring scheme for an overlay can be specified by clicking on the icon in the Color column for the overlay. The coloring options for track overlay displays are summarized in the table below:

Coloring ModeObjectsTracksAnchorsTrends
Solid Color(tick)


Color By Label

(tick) (2D)

(error) (3D)

Color By Object Type(tick)(tick)(tick)(tick)
Color By Name(tick)(tick)(error)(error)
Color By Measurement(tick)(tick)(tick)(tick)
Color By Class(tick)(tick)(tick)(tick)
Color By Cell(error)(error)(error)(error)

Image credits

  • Hernan Garcia, University of California - Berkeley, Berkeley CA
  • Stegmaier J, Mikut R. Fuzzy-based propagation of prior knowledge to improve large-scale image analysis pipelines. PLoS One. 2017 Nov 2; 12(11):e0187535.