Parameter sensitivity analysis of SCAG

The proposed SCAG has 3 important parameters, namely, the slice height (H), growth point number (N), and slice depth (D). Theoretically, the branch detection accuracy may be influenced by parameters H and N, whereas parameter D may influence only the accuracy of the branch angle calculation.

The sensitivity analysis of parameters H and N was evaluated with the F-score under different parameter combinations using a grid-searching method in Python. The parameter H was set as 0.5, 1, 1.5, 2, 2.5, and 3 cm relative to the height of the adjacent branching node. The parameter N was chosen from 20, 30, 40, 60, 80, 100, 120, and 140 by considering the point density around the branching node. Similarly, the sensitivity analysis of parameter D was evaluated with the correlation coefficient r under different selections using an equally spaced searching method in Python. Parameter D was chosen from 1.5, 2, 2.5, 3, 3.5, and 4 cm based on manual measurements.