APPROXIMATE TRANSFORMATION DEVICE FROM PARAMETRIC CURVE TO B-SPLINE CURVE

摘要

PURPOSE: To improve the efficiency of approximate transformation processing and to attain the reduction of processing load and the stability of processing. ;CONSTITUTION: After inputting a parametric curve and approximation accuracy, a parameter direction route determining part 13 determines a route group on the parametric curve. A B-spline curve approximate transformation part 14 approximately transforms a parameter direction route group to a B-spline curve group and a mesh-like node data constituting part 15 constitutes mesh-like node data from the node data of the B-spline curve group. A B-spline curve calculating part 16 calculates a B-spline curve from the mesh-like node data and a B-spline curve error evaluating part 17 executes the error evaluation of the B-spline curve. When the error of the approximate curve is not included within the inputted accuracy, a mesh-like node data reconstituting part 18 reconstitutes the mesh-like node data and a B-spline curve output part 19 outputs the B-spline curve.;COPYRIGHT: (C)1994,JPO&Japio