Original scientific paper

Parallax in a dynamic, non-contact & non-destructive, precise length measurement

Josip Stepanić ; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, I. Lučića 1, HR-10000 Zagreb, Croatia
Srđan Medić ; Karlovac University of Applied Sciences, I. Meštrovića 10, HR-47000 Karlovac, Croatia
Živko Kondić ; Varaždin University of Applied Sciences, J. Križanića 33/6, HR-42000 Varaždin, Croatia

Abstract

If a dimensional measurement on an object is to be performed during its non-perturbed motion, a specific approach is needed. In this article we consider length measurement of an object based on photographs of the object during its unperturbed motion. The main obstacle for determining measured length is the parallax which is generated as a convolution of contributions occurring in different parts of a measuring system. The quantitative expressions for the parallax are derived, and applied onto processing of the photos. As a result, we derive in a closed form the algorithm for quantitative estimates of the precisely measured length and accompanied standard deviation.

Keywords

length measurement; motion; non-contact measurement; non-destructive measurement; parallax; perturbation

Hrčak ID:

83905

URI

https://hrcak.srce.hr/83905

Publication date:

29.6.2012.

Article data in other languages: croatian

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