I am working with MRI images of the brain that have certain areas marked by hand like and .
I am trying to come up with an interpolating function that will let me describe such curves so that I can use machine learning techniques to automatically generate such markings on unmarked images like and .
I've considered using cubic spline interpolations to approximate the curve, but as far as I know, I would have to split the curve into multiple parts to interpolate it.
Am I on the right track or are there other (better?) ways to do this?