[joshqsumner]

Describe your changes
Adds a function to use cv2.mcc detectors in color card detection for times where there are multiple color-cards/similar objects or our other tools are unfamiliar to more cv2 inclined users.

Type of update
This is a new feature.

Associated issues
None

Additional context
This does not support some of the quality of life stuff that pcv.transform.detect_color_card does, namely the size scaling, but I don't see a way around that with how cv2.mcc returns information on the chips.
This also apparently requires opencv-contrib instead of just opencv since only that version has cv2.mcc.

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[deepsource-io]

DeepSource Code Review

We reviewed changes in 06b1625...4283fa6 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene   Coverage

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Python		Oct 17, 2026 5:10p.m.	Review ↗
Code coverage		Oct 17, 2026 5:10p.m.	Review ↗

Code Coverage Summary

Language	Line Coverage (New Code)	Line Coverage (Overall)
Aggregate	100% [✓ above threshold]	100%
Python	100% [✓ above threshold]	100%

➟ Additional coverage metrics may have been reported. See full coverage report ↗

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[maliagehan]

Tests pass, no coverage change, tested in a jupyter notebook (successful), which was added to google drive, added some documentation images since I generated them with testing. I think Noah wanted to have a larger discussion about addtional dependency and how we incorporate CV2 detectors, so won't merge for now.

[maliagehan]

Like the changes to documentation, we discussed a longer/larger change to color correction that might incorporate mcc more seamlessly into color correction workflow, but for now this function works and it's clear when it should be used. Tests pass, documentation looks good, analysis works (notebook is in google drive).