Regarding definition of mean curvature

Hello everyone!

I am extracting a centerline model for a geometry. By using the ‘markups’, I am drawing curves on the selected arteries and calculating geometric parameters like length and mean curvature. As we know, the curvature changes at every point and for drawing a curve, few control points are defined. So, for the calculation of the mean curvature, is it the mean curvature of the defined control points or is it something else?

Thank you!