In this study, we adapted very low resolution (240x320 = 76,800 pixels) images by which it is difficult to detect cracks. An automatic crack detection technique has been studied using digital image processing technology for low resolution images of sewage pipeline. Authors have developed two algorithms to detect cracks. The third step covers an algorithm developed to find optimal threshold value, and the sixth step deals with algorithm to determine cracks. As the result, in spite of very low-resolution images, the performance of crack detection turned out to be excellent.

Abstract
 1. 서 론
 2. 균열 탐지 과정
 3. 해석결과 및 고찰
 4. 결 론
 참고문헌

• 손병직(건양대학교 해외건설플랜트학과) | Son Byung Jik
• 전준룡(건양대학교 해외건설플랜트학과) | Jeon Joon Ryoung
• 허광희(건양대학교 해외건설플랜트학과) | Heo Gwang Hee 교신저자