what is endpoint in image processing?
This concept is related to the topological skeletonization of an object in shape analysis. It produces a thin sert of lines equidistant to the boundaries, preserving  geometrical and topological properties of the object. Some use the term medial axis. Some points possess a specific interest: branch or junction points (where sereval lines meet, i.e. a point with more than two neighbors) and termination, terminating or end points (a point with less than two neighbors), located at extremities.