Fig. 3
From: SpykProps: an imaging pipeline to quantify architecture in unilateral grass inflorescences
Spike length approximation methods included in SpykProps. Figures A–D show in the top: a binary mask with an overlayed red line indicating the approximated length; and the bottom: the scatterplot with a regression line of predicted (x-axis) and observed (y-axis) lengths, with the Pearson correlation coefficient (R; p < 0.001). The spike length in A and B are approximated as twice the major axis (longest red line) of a fitted ellipse on the spike (A) or its convex hull (B). The spike length in C and D are determined by Zhang’s (C) or medial axis (D) skeletonization algorithms. (E) Average execution time per spike in seconds across methods with standard error calculated from execution time of 810 binary images