Add Mask Statistics plugin with CSV export support

[Prat260104]

Overview

This PR introduces a new plugin: Mask Statistics.

While exploring the InVesalius plugin architecture and segmentation workflow,
I implemented this plugin to better understand how masks are internally represented
and how quantitative metrics can be exposed safely through the plugin system.

Features

• Displays basic mask statistics (voxel count, masked voxels)
• Computes physical volume (mm³ and cm³)
• Shows occupancy percentage
• Provides technical metadata (array shape, voxel spacing)
• Optional CSV export for external analysis

Implementation Notes

• Implemented entirely through the existing plugin system
• No modifications to core logic
• Uses mask data structures already available in the codebase
• Designed to fail gracefully if no mask is selected
• CSV export implemented using Python standard library only

Testing

Tested locally on macOS (Apple Silicon):

• Loaded sample dataset
• Created multiple masks
• Verified statistics consistency
• Validated CSV export output

The plugin is fully isolated and does not affect existing functionality.

[Prat260104]

Hi @tfmoraes @rmatsuda sir,

Just a gentle follow-up on this PR.
I’d appreciate any feedback whenever you have time.

If there are changes required (design, structure, documentation, or tests), I’d be happy to update accordingly.

Thanks again!

[Prat260104]

Hi @rmatsuda sir,

I’ve been exploring the InVesalius codebase to better understand the mask and visualization workflow, and as part of that exploration I implemented this Mask Statistics plugin to deepen my understanding of the plugin architecture.

I would appreciate your feedback when you have time, particularly regarding whether this aligns well with the existing plugin structure and if there are architectural or structural improvements you would recommend.

I’m continuing to study the codebase and would be glad to refine the implementation based on your suggestions.

Thank you.

— Prateek

[Prat260104]

hello @paulojamorim kindly review the PR