Features

Intrinsic Features

These features can be calculated with two input images (Data Image and Label Image). 
They are most commonly used for blob-like regions, such as nuclei.

1. Volume - number of voxels in the object (Dirk)
2. Integrated Intensity - sum of the intensities of all voxels in the object (Dirk)
3. Eccentricity - ratio of the distance between the foci to the length of the major axis (2D?) (Dirk)
4. Elongation - major axis length over minus axis length (2D?) (Dirk)
5. Orientation - angle between major axis and origin (2D) (Dirk) 
6. Bounding Box Volume - number of voxels in bounding box of object (Dirk)
7. Sum - same as integrated intensity (ITK statistics)
8. Mean - average intensity of voxels in the object (ITK statistics)
9. Median - middle intensity of voxels in the object (ITK statistics)
10. Minimum - minimum intensity of voxels in the object (ITK statistics)
11. Maximum - maximum intensity of voxels in the object (ITK statistics)
12. Sigma - standard deviation of intensity of voxels in the object (ITK statistics)
13. Variance - variance of intensity of voxels in the object (ITK statistics)
14. Radius Variation - standard deviation of distance from surface voxels to centroid (Isaac)
15. Skew - skew of the normalized intensity histogram (Isaac) (See Supplement B2)
16. Energy - energy of the normalized intensity histogram (Isaac) (See Supplement B2)
17. Entropy - entropy of the normalized intensity histogram (Isaac) (See Supplement B2)
18. Surface Gradient - average of surface gradients (Isaac)
19. Interior Gradient - average of interior gradients (Isaac)
20. Interior Intensity - average of interior intensities (Isaac) 
21. Surface Intensity - average of surface intensities (Isaac)
22. Intensity Ratio - ratio of surface intensity to interior intensity (Isaac)
23. Shared Boundary - ratio of surface area that touches another object to total surface area (Isaac)
24. Surface Area - number of voxels on surface of the object (Isaac)
25. Shape - Ratio of surface voxels to total voxels - compactness or thinness of object (Isaac) (See Supplement B2)
26. Texture - Similar to interior gradient, also exploring other texture measurements.