Scale features¶

This is a function to to transform the coordiantes of landmark points onto a common scale (0-1.0) Scaling is used to remove the influence of size on shape parameters. Returns a list of tuples.

plantcv.scale_features(obj, mask, points, boundary_line)

returns rescaled landmark points, a rescaled centroid point, a rescaled baseline point

• Parameters:
  • obj - A contour of the plant object (this should be output from the object_composition.py fxn)
  • mask - This is a binary image. The object should be white and the background should be black
  • points - A set of landmark points to be rescaled given the centroid of the object
  • boundary_line - A vertical coordinate that denotes the height of the plant pot, the coordinates of this reference point is also rescaled
• Context:
  • Used to rescale the point coordinates of landmark points, including centroid and boundary line

Input contour of plant object, an mask that denotes plant outline and landmark points

from plantcv import plantcv as pcv

# Set global debug behavior to None (default), "print" (to file), or "plot" (Jupyter Notebooks or X11)
pcv.params.debug = "print"

# Identify acute vertices (tip points) of an object
# Results in set of point values that may indicate tip points
points_rescaled, centroid_rescaled, bottomline_rescaled = pcv.scale_features(obj, mask, landmark_points, boundary_line)

Image of rescaled points in white, centroid is in gold and centroid at pot base is in blue