2.4 Root hair traits
As a result, of the root hair extraction, we were able to compute traits
based on the shape and distribution of individual root hairs as shown in
Figure 1. As such, we calculated the length of each individual root hair
and the density of root hairs on both sides of the root as the number of
root hairs per root edge length. Root hairs that were too short, too far
from the root or that emerged from a secondary root were not included
into the calculations. We excluded images where the algorithm failed to
identify the root edge correctly.