Camera calibration method of optical system for large field measurement of hot forgings in heavy industry
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F19%3APU133153" target="_blank" >RIV/00216305:26210/19:PU133153 - isvavai.cz</a>
Výsledek na webu
<a href="https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11056/1105635/Camera-calibration-method-of-optical-system-for-large-field-measurement/10.1117/12.2527693.full?SSO=1" target="_blank" >https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11056/1105635/Camera-calibration-method-of-optical-system-for-large-field-measurement/10.1117/12.2527693.full?SSO=1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1117/12.2527693" target="_blank" >10.1117/12.2527693</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Camera calibration method of optical system for large field measurement of hot forgings in heavy industry
Popis výsledku v původním jazyce
During the manufacturing process of heavy forgings, simple contact measuring techniques are still used to check the dimensions, therefore an optical measuring system is in demand. In this paper, a camera calibration method for the passive measuring system, which is being developed in collaboration with an industrial partner, is proposed. Our approach is based on space resection and works with robust coded targets, which are distributed in the field of view. The coordinates of targets are measured using TRITOP (GOM) measuring system. This solution allows to build a large calibration field, without a need of large calibration objects. The camera calibration works in 2 steps - at first, the intrinsic parameters of the camera, including lens distortion, are calibrated. These parameters are considered as stable, due to the use of special camera covers. Multi-image version of the calibration method and dense field of calibration targets are used. The second step is performed from every image and employs a single-image extrinsic camera parameters calibration method. Only a few coded calibration targets, mounted on stable objects in the scene, are required. The calibration method was tested in industrial conditions. The method showed great results, the average reprojection error was under 0.1 px. The effect of thermally affected zone on the calibration process is discussed.
Název v anglickém jazyce
Camera calibration method of optical system for large field measurement of hot forgings in heavy industry
Popis výsledku anglicky
During the manufacturing process of heavy forgings, simple contact measuring techniques are still used to check the dimensions, therefore an optical measuring system is in demand. In this paper, a camera calibration method for the passive measuring system, which is being developed in collaboration with an industrial partner, is proposed. Our approach is based on space resection and works with robust coded targets, which are distributed in the field of view. The coordinates of targets are measured using TRITOP (GOM) measuring system. This solution allows to build a large calibration field, without a need of large calibration objects. The camera calibration works in 2 steps - at first, the intrinsic parameters of the camera, including lens distortion, are calibrated. These parameters are considered as stable, due to the use of special camera covers. Multi-image version of the calibration method and dense field of calibration targets are used. The second step is performed from every image and employs a single-image extrinsic camera parameters calibration method. Only a few coded calibration targets, mounted on stable objects in the scene, are required. The calibration method was tested in industrial conditions. The method showed great results, the average reprojection error was under 0.1 px. The effect of thermally affected zone on the calibration process is discussed.
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
—
OECD FORD obor
10306 - Optics (including laser optics and quantum optics)
Návaznosti výsledku
Projekt
<a href="/cs/project/TJ01000268" target="_blank" >TJ01000268: Vývoj optického systému pro automatizované měření rotačních výkovků</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
Optical Measurement Systems for Industrial Inspection XI
ISBN
9781510627918
ISSN
0277-786X
e-ISSN
—
Počet stran výsledku
12
Strana od-do
1-12
Název nakladatele
SPIE
Místo vydání
Munich, Germany
Místo konání akce
Mnichov
Datum konání akce
24. 6. 2019
Typ akce podle státní příslušnosti
WRD - Celosvětová akce
Kód UT WoS článku
000502140100094