| Shape-based features |
| Area |
number of pixels |
| Circularity |
how compact or circular is the region |
| Compactness |
degree of deviation of the mass from a perfect circle |
| Convex area |
number of pixels in the convex image |
| Eccentricity |
ratio of distance between the foci of the ellipse and its major axis length |
| Equivalent diameter |
diameter of the circle with the same area as the region |
| Euler number |
subtraction of the number of objects and the number of holes in those objects |
| Extent |
ratio of pixels inside the region to pixels in the bounding box |
| Filled area |
number of pixels inside the filled image |
| Major axis length |
length of the major axis of an ellipse that has same normalized central moment with the region |
| Minor axis length |
length of the minor axis of an ellipse that has same normalized central moment with the region |
| Orientation |
angle between the axis of the ellipse that has same second moments with the region |
| Perimeter |
distance around the boundary of the region |
| Solidity |
relative amount of pixels that appeared in both the convex hull and the region |
| Shape ratio |
proportional relationship of the width to the height |
| Intensity-based features |
| Maximum intensity |
maximum of all the intensity values |
| Minimum intensity |
minimum of all the intensity values |
| FOS features |
| Average intensity |
mean of all the intensity values |
| Entropy |
texture measurement |
| Kurtosis |
correlated with probability distribution |
| Skewness |
asymmetry measurement |
| Smoothness |
measures the relative smoothness of intensity |
| Standard deviation |
variation from the average value |
| Variance |
how far are the pixels values from the average |
| GLCM features |
| Contrast |
amount of local variations |
| Correlation |
measurement of gray tone linear-dependencies |
| Energy |
information measurement |
| Homogeneity |
information about the distribution elements |
