ABSTRACT
ABSTRACT: The structures such as bridges, buildings and tall chimneys are subject to age as time goes and sometimes cause big disaster – such as breakdown or falling over. This kind of accidents can be estimated by measuring the displacement or vibrations of the structures. To solve this issue, bridge displacement/vibration measurement system using image processing with telescope lens to measure up to long distance (200 m) is developed and it can overcome the contact type system inefficiencies such as heavy, expensive property and temporary construction necessity. The system
is composed of tablet PC with IEEE1394 digital camera, telescope lens and a target mark. The key idea is a self designed target mark with which the pixel to mm ratio can be calibrated by the program and image processing algorithm where all pixels are added up for each row (column) to find out the center point. The system can display the displacement/vibration history graph and max/min. The system is implemented and the experimental results are shown compared with a contact type system.
