Add support for automatic size scaling using color cards#1726
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add to docs for auto_correct_color and detect_color_card
add helper that can set size scaling factors based on known color card chip dimensions of supported card types, and utilize in detect_color_card and therefore auto_correct_color
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add test that include auto size scaling factor definition
HaleySchuhl
added
work in progress
edit to inputs and code within _set_size_scale_from_chip
… the new parameter
HaleySchuhl
added
ready to review
update
joshqsumner
approved these changes
Jul 16, 2025
rather than as a keyword argument
also make the superscript look nicer with HTML
make color_chip_size a positional argument
This function only works for Macbeth ColorCheckers
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@HaleySchuhl one question, why are there two pictures of the Passport in the |
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Describe your changes
Add support for automatic size scaling using supported color cards, by setting the
pcv.params.unit,pcv.params.px_width, andpcv.params.px_heightautomatically when acolor_chip_sizeis provided topcv.transform.detect_color_cardorpcv.transform.auto_correct_color. Current support includes "classic", "CameraTrax", or "passport" (the parameter is case insensitive and defaults toNone). Users can also set this parameter to a tuple e,g,color_chip_size=(40,40)where dimensions should be provided in millimeters.Type of update
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Additional context
Does not currently support "nano" type color cards, since the rectangular chip dimensions have the added complexity of being orientation specific. This can get added in a future update, though, since we are detecting orientation through locating the white color card chip.
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plantcv/mkdocs.ymlupdating.md