Share Email Print

Proceedings Paper

Efficient algorithm for error elimination from surface measurement generated by a mechanical probe
Author(s): Mahnaz Akbary-Safa; Ibrahim I. Esat; Colin B. Besant
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A surface measurement performed using a coordinate measuring machine with a mechanical probe may result in errors due to the contact point not being coincident with the recording point on the probe. The error between the recorded point and the surface is a function of the probe geometry and the surface shape. Typically the measured surface is represented by a point table recorded at equal intervals. A conventional way of generating the 'true' surface from the recorded points is based on parametric surface patches. This is applicable as the points are regularly distributed on the surface. All the information necessary to identify the real surface is provided by the orthogonal vector to the surface together with the probe shape. The disadvantages of this method are computational inefficiency, but more importantly there is loss of information resulting from the interpolation techniques used. This information could be vital, especially where surface discontinuities occur. The method proposed in this paper does not use surface patches as the basis of its approach. The information about the 'true' surface is directly extracted from the measured point table by a simple search algorithm. This paper presents the search algorithm results to verify it.

Paper Details

Date Published: 1 August 1990
PDF: 9 pages
Proc. SPIE 1251, Curves and Surfaces in Computer Vision and Graphics, (1 August 1990); doi: 10.1117/12.19758
Show Author Affiliations
Mahnaz Akbary-Safa, Imperial College (United Kingdom)
Ibrahim I. Esat, Queen Mary College (United Kingdom)
Colin B. Besant, Imperial College (United Kingdom)

Published in SPIE Proceedings Vol. 1251:
Curves and Surfaces in Computer Vision and Graphics
Leonard A. Ferrari; Rui J. P. de Figueiredo, Editor(s)

© SPIE. Terms of Use
Back to Top