Fig. 6
From: SpykProps: an imaging pipeline to quantify architecture in unilateral grass inflorescences
Effect of additional color descriptors on separability of spikes with similar color profile. A Example of three spikes with similar color profiles selected from a random image (Additional file 1: Figure S1). B–E Standardized (0–1) principal components with their percentage of variance explained, derived from various number of color descriptors for 8892 spikes encompassing 694 images. Circles and numbers correspond to a subset of all spikes in Additional file 1: Figure S2; colored circles refer to spikes in A. Descriptors are mean RGB values (B); different descriptors of the pixel frequency distribution for R, G, and B (C); same descriptors as in B, for all channels in RGB, HSV, and Lab color spaces (D); same descriptors as in C in addition to the coefficient of variation (CV) and quantile-based CV for each channel (E)