Whenever we create or modify objects, the purpose is usually to extract some useful numerical value pertaining to these objects. In arivis we call these Features of the objects, and these can include values like:

• Morphological information (volume, surface area, length, sphericity...)
• Intensity values (mean, max, min etc, for any channel in the image)
• Object specific features (e.g. number of children for groups, average speed for track, number of branches for traces)

The complete list of available features is covered in the help files (User Interface>Additional Windows> View Objects> Object Features), and additional features can be created by using Custom Features. Custom Features can be used to:

• Create group statistics (feature statistics for all or just some of the children in the group)
• Create object counts for groups that include multiple children types (e.g. cells with two different labeled vesicles)
• Compute new features from existing features (e.g. ratio of intensities between 2 channels, number of children per unit volume, and many more)

The Export Object Features operation, allows us to create an excel spreadsheet containing the numerical information generated by the pipeline. In our example we exported a spreadsheet containing both the information pertaining to tracks and the tracked objects.