This work discusses the use of cameras for measurements of dynamic structural responses.
Structures oscillate with very small displacement amplitudes, particularly so at high frequencies, which are hard to measure with cameras. Camera measurements also produce large amounts of data, which should be analysed in a reasonable amount of time.
A review of some of the Optical Flow methods used to identify displacements from videos and some modal parameter identification techniques is presented.
The influential parameters and the potential of high-speed camera measurements are discussed.
The greatest contributions of this work are the determination of the displacement resolution potential, the hybrid modal identification below the camera's noise floor and the developed measurement technique for identification of individual displacement spectral components from images produced by still-frame cameras.