Method for generating error image and program for generating error image

摘要

A point group on a surface parametric space of free-form surface data corresponding to a measurement points is calculated as a first point group. Error data between each of measurement points and design points is calculated. The first point group is triangulated to generate first triangular facets and calculate a convex hull of the first point group. A second point group distributed in the calculated convex hull on the surface parametric space is set. Error data of the second point group is obtained from error data corresponding to the first point group. A point group including the first point group and the second point group is re-triangulated to generate a second triangular facets.

主权项

1. A method for generating an image indicating errors comprising:
receiving measurement points obtained by measuring a measured surface of a measurement object by a three-dimensional measuring instrument in an arithmetic processing unit; receiving free-form surface data which is design data of the measurement object in the arithmetic processing unit; calculating a point group on a surface parametric space of the free-form surface data corresponding to the measurement points, as a first point group; calculating error data between each of measurement points and design points on the free-form surface data corresponding to the measurement points; triangulating the first point group to generate first triangular facets and calculate a convex hull of the first point group; setting a second point group distributed in the calculated convex hull on the surface parametric space; obtaining error data of each of points of the second point group by interpolation calculation from error data corresponding to the first point group which is a vertex of the first triangular facets in which each of the respective points of the second point group is included; re-triangulating a point group including the first point group and the second point group to generate second triangular facets; and outputting to an output device the second triangular facets and error data of a vertex of the second triangular facets in order to generate the image indicating errors based on the second triangular facets and error data of the vertex of the second triangular facets.