Table 2.

Feature domains and types

Feature domain	Feature type	Feature number
Differentiable features	Z-profile of Frangi filters	4
	Z-profile of matched filters	4
	Gaussian-filter-smoothed Z-profile of the gradient magnitude	4
	Vessel confidence measure	1
Spatial features	Z-profile of granular decomposition	4
Gabor features	Z-profile of Gabor features	4
Deep-learning features	Activation maps of the final decoder layer	16