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 |