Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Study on Improvement of Measurement Precision in Digital Image Correlation Measurement Method by Using Subpixel Algorithms

이미지 상관법의 서브 픽셀 알고리즘을 이용한 측정 분해능 향상에 관한 연구

  • Kim, Seung Jong (Department of Business Incubator Center, Chonbuk University) ;
  • Kang, Young Jun (Eco-Friendly Machine Parts Design Research Center, Chonbuk University) ;
  • Choi, In Young (Department of Mechanical Design Engineering, Chonbuk University) ;
  • Hong, Kyung Min (Department of Mechanical Design Engineering, Chonbuk University) ;
  • Ryu, Won Jea (Management Planning Headquarters, Korea Institute of Carbon Convergence Technology)
  • 김성종 (전북대학교 창업보육센터) ;
  • 강영준 (전북대학교 친환경부품센터) ;
  • 최인영 (전북대학교 기계설계학과) ;
  • 홍경민 (전북대학교 기계설계학과) ;
  • 유원재 (한국탄소용합기술원 경영지원실)
  • Received : 2015.01.16
  • Accepted : 2015.09.08
  • Published : 2015.12.01
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Abstract

Contact type sensors (e.g., displacement sensor and strain gauge) were typically used to evaluate the safety and mechanical properties in machines and construction. However, those contact type sensors have been constrained because of measurement problems such as surface roughness, temperature, humidity, and shape. The Digital Image Correlation (DIC) measurement system is a vision measurement system. This measurement system uses the taken image using a CCD camera and calculates the image correlation between the reference image and the deformed image under external force to measure the displacement and strain rates. In this paper, we discuss methods to improve the measurement precision of the digital image correlation measurement system. A tensile test was conducted to compare the precision improvement effects, by using the universal test machine and the DIC measurement system, with the use of subpixel algorithms, i.e., the Coarse Fine Search (CFS) algorithm and the Peak Finding (PF) algorithm.

Keywords

References

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