Camera calibration method of optical system for large field measurement of hot forgings in heavy industry

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Camera calibration method of optical system for large field measurement of hot forgings in heavy industry

Original language description

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.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

<a href="/en/project/TJ01000268" target="_blank" >TJ01000268: Development of an optical system for the measurement of rotationally symmetric forgings</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Optical Measurement Systems for Industrial Inspection XI

ISBN

9781510627918

ISSN

0277-786X

e-ISSN

—

Number of pages

12

Pages from-to

1-12

Publisher name

SPIE

Place of publication

Munich, Germany

Event location

Mnichov

Event date

Jun 24, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000502140100094