Key points are not available for this paper at this time.
The main part of this paper describes how to create efficiently a data structure which allows the use of approximation techniques to obtain consistent polygonal outlines of the objects in a picture. In addition, it gives a method for editing the regions obtained from the application of a segmentation algorithm. Examples involving solid geometrical objects, X-ray pictures, and human faces are given.
Feng et al. (Thu,) studied this question.