Publication detail

Development of a photogrammetry system for the measurement of rotationally symmetric forgings

ZATOČILOVÁ, A. PALOUŠEK, D. BRANDEJS, J.

Original Title

Development of a photogrammetry system for the measurement of rotationally symmetric forgings

English Title

Development of a photogrammetry system for the measurement of rotationally symmetric forgings

Type

conference paper

Language

en

Original Abstract

The paper presents development of system for the measurement of shape and dimensions of rotationally symmetric forgings under high temperature. Demands on measurement accuracy of these large semifinished products are in the order of millimetres. The challenge is to design a measurement system that overcomes problems caused by high temperature and provide instant results without interrupting the production process. Proposed approach exploiting the fact, that the measured parts have simple rotationally symmetric shape and contrast between them and background is very high. Basic idea is 3D remonstration of actual forging shape from four boundary curves which lie in two mutually perpendicular planes (in the simplest case). Four boundary curves can be obtained by detecting forging edges in two images. This approach has been incorporated into a software application that was created in Matlab programming environment. Main parts of the system, such as calibration, edge detection, spatial orientation and evaluation of information about shape and dimensions of measured parts, have been designed so that the entire measurement process takes only a few seconds. The article focuses on individual parts of the software application. It discusses the suitability of usage of particular mathematical models and designed multi-step edge detection method, which is based on thresholding, directional median filter, validation and correction of detected edge points.

English abstract

The paper presents development of system for the measurement of shape and dimensions of rotationally symmetric forgings under high temperature. Demands on measurement accuracy of these large semifinished products are in the order of millimetres. The challenge is to design a measurement system that overcomes problems caused by high temperature and provide instant results without interrupting the production process. Proposed approach exploiting the fact, that the measured parts have simple rotationally symmetric shape and contrast between them and background is very high. Basic idea is 3D remonstration of actual forging shape from four boundary curves which lie in two mutually perpendicular planes (in the simplest case). Four boundary curves can be obtained by detecting forging edges in two images. This approach has been incorporated into a software application that was created in Matlab programming environment. Main parts of the system, such as calibration, edge detection, spatial orientation and evaluation of information about shape and dimensions of measured parts, have been designed so that the entire measurement process takes only a few seconds. The article focuses on individual parts of the software application. It discusses the suitability of usage of particular mathematical models and designed multi-step edge detection method, which is based on thresholding, directional median filter, validation and correction of detected edge points.

Keywords

Forging, optical measurement, image analysis, photogrammetry

RIV year

2015

Released

22.06.2015

Publisher

SPIE-INT SOC OPTICAL ENGINEERING

Location

Munich, GERMANY

ISBN

9781628416855

Book

Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 952501 (June 22, 2015);

Edition

Volume 9525

Pages from

95250R

Pages to

95257R

Pages count

7

URL

BibTex


@inproceedings{BUT115576,
  author="Aneta {Zatočilová} and David {Paloušek} and Jan {Brandejs}",
  title="Development of a photogrammetry system for the measurement of rotationally symmetric forgings 
	
",
  annote="The paper presents development of system for the measurement of shape and dimensions of rotationally symmetric forgings under high temperature. Demands on measurement accuracy of these large semifinished products are in the order of millimetres. The challenge is to design a measurement system that overcomes problems caused by high temperature and provide instant results without interrupting the production process.
Proposed approach exploiting the fact, that the measured parts have simple rotationally symmetric shape and contrast between them and background is very high. Basic idea is 3D remonstration of actual forging shape from four boundary curves which lie in two mutually perpendicular planes (in the simplest case). Four boundary curves can be obtained by detecting forging edges in two images. This approach has been incorporated into a software application that was created in Matlab programming environment. Main parts of the system, such as calibration, edge detection, spatial orientation and evaluation of information about shape and dimensions of measured parts, have been designed so that the entire measurement process takes only a few seconds. The article focuses on individual parts of the software application. It discusses the suitability of usage of particular mathematical models and designed multi-step edge detection method, which is based on thresholding, directional median filter, validation and correction of detected edge points.
",
  address="SPIE-INT SOC OPTICAL ENGINEERING",
  booktitle="Proc. SPIE  9525, Optical Measurement Systems for Industrial Inspection IX, 952501 (June 22, 2015);",
  chapter="115576",
  doi="10.1117/12.2184916",
  edition="Volume 9525",
  howpublished="print",
  institution="SPIE-INT SOC OPTICAL ENGINEERING",
  year="2015",
  month="june",
  pages="95250R--95257R",
  publisher="SPIE-INT SOC OPTICAL ENGINEERING",
  type="conference paper"
}