NDLI: Profile measurement via circle-line spline fitting

Content Provider	IEEE Xplore Digital Library
Author	Harker, M. O'Leary, P. Neumayr, R.
Copyright Year	2009
Description	Author affiliation: Inst. for Autom., Univ. of Leoben, Leoben, Austria (Harker, M.; O'Leary, P.; Neumayr, R.)
Abstract	For quality control purposes, it is necessary to measure an object's dimensions, and compare them with a CAD model; this is effectively a reverse engineering task. The specific example addressed in this paper is the measurement and modelling of cold rolled steel profiles. The profile of the steel tubing can be measured with an arrangement of light sectioning heads, whereby the measurement data must be modelled to extract the measured dimensions, e.g., radii, angles, etc. The manufactured tubing is designed such that its profile is composed of only straight lines and circular arcs which are mutually tangent at each vertex. In this paper we develop an algorithm for fitting such a “circle-line spline” by orthogonal distance least squares. We derive the tangency constraints for such a spline and show that the optimization can be performed with constrained Gauss-Newton optimization. Through numerical testing we show that the algorithm effectively models the profile dimensions, and is stable in the presence of measurement noise.
Sponsorship	IEEE Instrum. Meas. Soc.
Starting Page	1531
Ending Page	1536
File Size	664962
Page Count	6
File Format	PDF
ISBN	9781424433520
ISSN	10915281
DOI	10.1109/IMTC.2009.5168698
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-05
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spline Fitting Steel Least squares methods Constraint optimization Quality control Reverse engineering Data mining Manufacturing Newton method
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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