To monitor static and dynamic responses of bridges, an image-based monitoring system using networking PTZ IP (Pan-Tilt-Zoom Internet Protocol) cameras has been developed. Triggers to acquire video or still-images are performed when structural events like vibrations or excessive displacements occur. Also, periodic or user-defined triggers can be performed. When a trigger occurs, the system collects bridge members' images along the pre-defined touring route of a group of presets and extracts relative displacements between images.

• 박종칠(한국도로공사 도로교통연구원 책임연구원, 공학박사) | Park, Jong Chil 교신저자
• 조준상(한국도로공사 도로교통연구원 책임연구원, 공학박사) | Cho, Jun Sang
• 길흥배(한국도로공사 도로교통연구원 수석연구원, 공학박사) | Gil, Heung Bae
• 서정욱(한국도로공사 서해대교관리소 과장, 공학석사) | Seo, Jeong Wook