FEASIBILITY OF FREQUENCY IDENTIFICATION AND ANOMAY DETECTION OF A HIGHWAY POLE STRUCTURE FROM VIDEO FOOTAGE

Abstract

This study is intended to discuss the feasibility of the frequency identification and anomaly detection of highway pole structures from video footage. The accuracy of the identified frequencies from video footage is investigated through a laboratory experiment on a full-scale pole structure. Loosening anchor bolt conditions are considered as a damage scenario. In order to extract vibration modes of the pole structure, this study applies Phase-based motion magnification method which processes to the whole image frame and expands the designated frequency bands. Then, vibration waves are extracted by tracking the featured points in the image frame. Although the accuracy of estimated frequency identified from the vibration modes extracted from the video footage still needs improvement, the decreasing tendency of the frequency due to the damage scenario was observed. This study also investigates ways to remove background in the video image for the purpose of reducing influences of noise and improving identification accuracy.