Improvements in imaging technology have led to high resolution satellites, microscopes, scanners and telescopes acquiring single images upwards of 100GB in volume - far beyond the RAM capability of a typical computer core. The visualization tools provided by current software in python are in their infancy, with little support for high dimensional images and results visualization. This leads to a fragmented workflow for users, and a high bar to entry for extending or customizing functionality.

Human inspection of these images forms a key part of the research process. Frequent visualization in between processing and analysis steps, as well as during the exploratory phase, is critical for effective analysis and ensuring the correctness of results.

This talk introduces napari- a fast, general purpose image viewer in python- in the context of a remote-sensing application on Sentinel satellite images. It is targeted both at existing python programmers who wish to view complex imaging datasets in real time and develop their own functionality on top of the viewer, and those new to python who want to make the most out of their data without needing to write hundreds of lines of code. In more detail this talk will cover:

• An overview of napari
• An introduction to extending napari through its plugin ecosystem
• A demonstration of a system supporting human-in-the-loop analysis of Sentinel satellite images and their associated result data

This talk will introduce new tools to support imaging research workflows and give confidence to both new and experienced python programmers that effective, performant, near-real time out-of-core visualization is possible even when dealing with vast imaging datasets. All software and packages discussed throughout this talk are open-source and available at the following links:

• napari : https://napari.org/docs/dev/
• napari plugin guide: https://napari.org/docs/dev/plugins/for_plugin_developers.html
• napari-sentinel-to-zarr: https://github.com/DragaDoncila/napari-sentinel-to-zarr