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A demo napari plugin incorporating reader, writer and dock widget contributions using the new npe2 plugin architecture.

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A demo napari plugin incorporating reader, writer and dock widget contributions using the new npe2 plugin architecture.

This napari plugin was generated with Cookiecutter using @napari's cookiecutter-napari-plugin template.


You can install workshop-demo via pip:

pip install workshop-demo

To install latest development version :

pip install git+

What is this?

This plugin was created to serve as a semi-meaningful example of a plugin using the new napari npe2 architecture.

It provides a reader, a writer and two dock widgets to support opening, processing and writing out cell tracking challenge data.

We've provided comments and example tests that can be used as a reference when building your own plugin.

Using this plugin

Sample Data

You can download sample data for this plugin from the tracking challenge website. Any 2D+T sequence should work, but this plugin has been tested only with the Human hepatocarcinoma-derived cells expressing the fusion protein YFP-TIA-1 dataset.

Reading Data

This plugin's reader is designed for tracking challenge segmentation gold standard ground truth data conforming to the file format described in the data specification.

Ground truth data is only provided for a subset of the frames of the entire sequence. This reader will attempt to find the number of frames of the associated sequence in a sister directory of the ground truth data directory and open a labels layer with the same number of frames, thus ensuring the labelled data is correctly overlaid onto the original sequence.

Segmenting Data

One of the dock widgets provided by this plugin is "Segment by Threshold". The widget allows you to select a 2D+T image layer in the viewer (e.g. any of the sequences in the Human hepatocarcinoma dataset above) and segment it using a selection of scikit-image thresholding functions.

The segmentation is then returned as a Labels layer into the viewer.

Highlighting Segmentation Differences

The second dock widget provided by this plugin allows you to visually compare your segmentation against the ground truth data by computing the difference between the two and adding this as a layer in the napari viewer.

To use this widget, open it from the Plugins menu and select the two layers you wish to compare.

Writing to Zip

Finally, you can save your segmentation to a zip file whose internal directory structure will closely mimic that of the tracking challenge datasets, so that it may be opened again in the viewer.

To save your layer, choose File -> Save selected layer(s) with one labels layer selected, then select label zipper from the dropdown choices.


Contributions are very welcome. Tests can be run with tox, please ensure the coverage at least stays the same before you submit a pull request.


Distributed under the terms of the BSD-3 license, "workshop-demo" is free and open source software


If you encounter any problems, please file an issue along with a detailed description.

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