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Table 1 Explanation of geometric and color variables studied

From: Computer-aided clinical image analysis for non-invasive assessment of tumor thickness in cutaneous melanoma

Classification

Parameter

Explanation

Geometry variables

Area

Lesion surface area, measured in cm2

Maximum diameter (MaxD)

the longest line that joins two points on the border of the lesion, measured in cm

Perimeter

Total boundary length of the region of interest (i.e., lesion), measured in cm

Circularity

Ratio of the perimeter of the lesion divided by the perimeter of a circle with the same midpoint and same area as the lesion

Mean radius (Rm)

Mean value of the lesion’s radii

Eccentricity

Distance between color and geometric midpoint within the lesion

Color variables (values 0–255)

Range of red, green, blue

Range of values of red, green, blue intensity

Mean red, green, blue

Mean value of red, green, blue intensity within the lesion

SD of red, green, blue

Standard deviation of red, green, blue intensity within the lesion

CV of red, green, blue

Expresses the standard deviation of red, green, blue intensity values as mean percentage

Skewness from Gaussian curve (red, green, blue)

Deviation of each color’s histogram from the normal distribution curve