Table 1.

List of shape descriptors and their definition

Property name	Description
Area	Actual number of pixels in the region
Perimeter	Distance around the boundary of the region
Eccentricity	Eccentricity of the ellipse that has the same second-moments as the region, returned as a scalar. The eccentricity is the ratio of the distance between the foci of the ellipse and its major axis length. The value is between 0 and 1. An ellipse whose eccentricity is 0 is actually a circle, while an ellipse whose eccentricity is 1 is a line segment
Minor axis	Length of the minor axis of the ellipse that has the same normalized second central moments as the region
Major axis	Length of the major axis of the ellipse that has the same normalized second central moments as the region.
Aspect Ratio	Major axis/minor axis ratio.
Roundness	$4\times \frac{\left[\text{Area}\right]}{\mathrm{\pi }\times {\left[\text{Major axis}\right]}^2}$. A value of 1.0 indicates a perfect circle. As the value approaches 0.0, it indicates an increasingly elongated shape
Number of condensations	Number of regions in the image.
Roughness	$\frac{\left[\text{Convex Perimeter}\right]}{\left[\text{Perimeter}\right]}$. It will take the value of 1 for a convex object, and will be less than 1 if the object is not convex. Objects having high roughness values show irregular boundaries.
Distance	Average of the 4 nearest-neighbor distance (calculated as centroid to centroid distance)
Occupancy	A circular region having as extremes of the diameter the most distant pixels belonging to the condensation is first selected. In this region the occupancy is given by the ratio between the area of the pixel belonging to the condensations and the total area.