CIM algorithm for approximating three-dimensional polygonal curves

The polygonal approximation problem is a primary problem in computer graphics, pattern recognition, CAD/CAM, etc. InR2, the cone intersection method (CIM) is one of the most efficient algorithms for approximating polygonal curves. With CIM Eu and Toussaint, by imposing an additional constraint and changing the given error criteria, resolve the three-dimensional weighted minimum number polygonal approximation problem with the parallel-strip error criterion (PS-WMN) underL2 norm. In this paper, without any additional constraint and change of the error criteria, a CIM solution to the same problem with the line segment error criterion (LS-WMN) is presented, which is more frequently encountered than the PS-WMN is. Its time complexity isO(n3), and the space complexity isO(n2). An approximation algorithm is also presented, which takesO(n2) time andO(n) space. Results of some examples are given to illustrate the efficiency of these algorithms.