In this study, a PTZ(Pan-Tilt-Zoom) system was applied as the methods for measuring the deformation angle of a steel pipe elbow. An image of the steel pipe elbow was enhanced using an image filter processing algorithm. To measure the deformation angle, the Hough transform was applied to the enhanced image to facilitate line recognition. In this study, the limit state of the elbow was defined as rupture or leakage. To verify the validity of measuring the deformation angle of a steel pipe elbow by using a PTZ system, an in-plane cyclic loading test was conducted so that deformation angles that are too large to measure using a conventional sensor could be measured effectively.

Abstract
 1. 서 론
 2. 실험 계획 및 방법
 3. 실험결과
 4. 결 론
 참고문헌

• 김성완(부산대학교 지진방재연구센터) | Kim Sung Wan 교신저자
• 전법규(부산대학교 지진방재연구센터) | Jeon Bub Gyu
• 윤다운(부산대학교 지진방재연구센터) | Yun Da Woon