Improvement of the Accuracy and Conveniency in Automated Strain Measurement through High-Resolution Image Processing

고해상도 화상처리를 통한 자동 변형률 측정의 정확도와 편의성 개선

  • 김형종 (강원대학교 기계.메카트로닉스공학부) ;
  • 최선철 (강원대학교 대학원)
  • Published : 2006.06.15

Abstract

An automated surface-strain measurement system, named ASIAS, was developed by using the image processing and stereo vision techniques in the previous studies by the corresponding author and his coworkers. This system has been upgraded mainly to improve the accuracy through image enhancement, sub-pixel measurement, surface smoothing, etc., since the first version was released. The present study has still more improved the convenience of users as well as the accuracy of measurement by processing high resolution images 8 mega pixels or more which can be easily obtained from a portable digital steal camera. It is proved that high resolution image processing greatly decreases the measurement error and gives strain data without considerable deterioration of accuracy even when the deformed grids to be measured and the master grids for camera calibration are captured together in the same image, making the whole process of strain measurement much simpler.

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