Szczegóły publikacji
Opis bibliograficzny
A motion magnification application in video-based vibration measurement / Krzysztof HOLAK // W: Advances in mechanism and machine science : proceedings of the 15th IFToMM World Congress on Mechanism and Machine science : [June 30–July 4, 2019, Krakow, Poland] / ed. Tadeusz Uhl. — Cham : Springer Nature Switzerland, cop. 2019. — (Mechanisms and Machine Science ; ISSN 2211-0984 ; Vol. 73). — ISBN: 978-3-030-20130-2; e-ISBN: 978-3-030-20131-9. — S. 4135–4144. — Bibliogr., Abstr. — Publikacja dostępna online od: 2019-06-14
Autor
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 123465 |
|---|---|
| Data dodania do BaDAP | 2019-10-31 |
| DOI | 10.1007/978-3-030-20131-9_412 |
| Rok publikacji | 2019 |
| Typ publikacji | materiały konferencyjne (aut.) |
| Otwarty dostęp |  |
| Wydawca | Springer |
| Czasopismo/seria | Mechanisms and Machine Science |
Abstract
In the field of non-destructive testing (NDT) and Structural Health Monitoring (SHM), physical properties of objects’ are studied and their states evaluated through the measurement of vibration response and subsequent analysis with a use of physical models. The usual way of obtaining a vibration data are contact sensors placed on the structure. However, an application of these methods may be difficult and take a lot of time. Measurements are limited to a finite, usually small, set of points. The main advantage of cameras in vibration measurement is a possibility of having a dense grid of measurement points. However, a practical use of these methods is difficult, mainly because of the limited spatial resolution and image noise. An application of motion estimation using phased-based optical flow makes it possible to have a vision-based measurement of small amplitude vibrations. It may be used to magnify or attenuate motion amplitude in a given frequency band which may find an application in Structural Health Monitoring systems. In the paper, an experimental investigation of phase-based motion magnification for non-contact vibration measurement is presented. Estimation of vibration frequencies of a free-free beam structure based on high-speed camera video signal has been carried out. Next, an application of motion magnification algorithm for restoration of band-limited video signal by increasing spatial magnitude of motion is shown. Finally, a preliminary test of single frequency component extraction based on video sequence of a structure excited by a white noise signal which may find an application in direct visualization of mode shapes has been presented.
