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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 contains 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 in on the Object Set Settings page.

Interface

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

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Overlay types

There are four (4) display overlays that are associated with a for track display:

• Objects,   which can be outlines in 2D or surfaces meshes in 3D
• Tracks,   which indicates indicate the current and previous positions of the tracked objectobjects in the form of lines
• Anchors,   which shows the object centroid / location show the positions (centroids) of the object objects on the current and, optionally, previous frames
• Trends,   which shows show the general heading of a given track from a certain point headings of tracks between specified points in time

Each overlay has different settings that can be adjusted and they can each be toggled independently of each other. Below are examples of the different types of track overlays (click on the 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

.

Rendering modes

If you have a 3D object that is objects tracked over time, you can specify the rendering mode for the object surfaces meshes in 3D view View by clicking on the icon associated with the selected item in in the View column . Clicking on the icon will bring up a list of render mode options that are available for the selected itemfor the object group and then selecting the mode from the menu that opens. There are three options(3) rendering modes for meshes:

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

A comparison between the three (3) rendering-mode displays

is shown below (click on

an image to enlarge it)

.

Track display

Tracks are the 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 objects object from its previous position to its new position on the current frame. There are two (2) adjustments that are available for tracks display:Options for track display are given in the table below.

You can drag the Set Track Length slider to the left or right or use the adjacent textbox to adjust the maximum track length to display. Alternately, you can specify the value by entering a number to the textbox on the right.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.

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 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.

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Anchor display

Anchors show the position of the tracked object based on its '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 anchors anchor display:

Same as the tracks display, you can adjust the radius of 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:

Trend display

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

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

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

Coloring options

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

Coloring Mode	Objects	Tracks	Anchors	Trends
Solid colorColor
Color by labelBy Label	(2D)  (3D)
Color by object typeBy Object Type
Color by nameBy Name
Color by measurementBy Measurement
Color by classBy Class
Color by cellBy Cell

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. https://doi.org/10.1371/journal.pone.0187535