[ Technical Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 30, No. 4, pp.323-331

ISSN: 2508-5107 (Online)

Print publication date 15 Aug 2021

Received 10 Jun 2021 Revised 19 Jul 2021 Accepted 21 Jul 2021

DOI: https://doi.org/10.7735/ksmte.2021.30.4.323

이미지 보정을 이용한 제한된 환경에서의 디지털 이미지 상관법

오주환^a ; 김종민^b ; 이철수^b^{, *}

Digital Image Correlation using Image Calibration under Restricted Environment

Ju Hwan Oh^a ; Jong Min Kim^b ; Cheol Soo Lee^b^{, *}

aDepartment of Mechanical Engineering, Graduate School, Sogang University
bDepartment of Mechanical Engineering, Sogang University

Correspondence to: ^*Tel.: +82-2-705-8646 E-mail address: cscam@sogang.ac.kr (Cheol Soo Lee).

Abstract

Digital Image Correlation (DIC) is a new method of measuring material properties. DIC requires a fixed camera and a separate instrument to acquire images. The measurement position and orientation for the DIC measurement of a workpiece are severely constrained. Therefore, additional devices are required. In this study, only a marker with a grid pattern was attached, and a photograph of a specimen surface was captured without additional equipment. Specimen images were moved and tilted because the camera would shake during the experiment and the camera and specimen were not parallel. The acquired specimen images might be shifted or deformed. Sample images were acquired form various angles and then calibrated with perspective transformation by a developed algorithm and software. Surface strain (or deformation) field data were obtained using the calibrated specimen images and DIC. Therefore, the developed algorithm was verified by comparing the strain field data of the corrected DIC images.

Keywords:

Digital image correlation, Perspective transformation, Image warping, Tensile test, Strain field

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Ju Hwan Oh

M.S. candidate in the Department of Mechanical Engineering, Sogang University.

His research interests are image calculation using digital image correlation and design of medical device and industrial robot.

E-mail: ojh82444@gmail.com

Jong Min Kim

Research professor in the Department of Mechanical Engineering, Sogang University.

His research interests are Robot system and control and radiopharmaceutical automatic manufacturing system.

E-mail: griffon0@gmail.com

Cheol Soo Lee

Professor in the Department of Mechanical Engineering, Sogang University.

His research interests are geometric modeling and computer aided manufacturing and design of machine tools and medical device development and manufacturing.

E-mail: cscam@sogang.ac.kr