Table 1 Geometric descriptors of spike and spikelet shape
From: SpykProps: an imaging pipeline to quantify architecture in unilateral grass inflorescences
Property | Description | Purpose |
|---|---|---|
Areaa | Number of pixels within the ROIb | Quantifies the ROI’s area |
Eccentricity | Measure of elongation | Helps to identify curved spikes |
Equivalent diameter | Diameter of a circle with same the area | Provides a latent measure of ROI's size and shape with reference to a circle |
Extents | Ratio of the ROI’s bounding box area to the Area | Provides a latent measure of the ROI's spread or aperture |
Ferets | Estimate of longest and shortest distance within the ROI’s outline | Useful to estimate width on non-curved ROI's. Unlike Minor Axis, it considers the overall shape rather than a fitted ellipse |
Major axis | Length of the longest axes of an ellipse fitted on the ROI | Provides a fast estimate of length on non-curved ROI's |
Minor axis | Length of the shortest axes of an ellipse fitted on the ROI | Provides a fast estimate of width on non-curved ROI's |
Perimeter | Length of the ROI's outline | Provides a latent measure of the ROI's size |
Solidity | Ratio of the Area to the ROI's convex hull's area | Provides a latent measure of shape |