This study presents a novel image-based vibration monitoring method for structural health assessment. The proposed method utilizes cameras installed inside a building to track a distant, fixed external reference point. By analyzing the relative motion in zoomed images using super-resolution image processing, building displacements are accurately estimated. The effectiveness of the proposed method was confirmed by comparing its measurements of ambient vibrations in a high-rise building with those obtained from a microtremor sensor. It also works with images captured urgently during earthquake without prior setup. This low-cost, non-invasive, and rapidly deployable technique is especially valuable for structural vibration measurement.
Minami et al. (Thu,) studied this question.