Mr. Takehiro Tsuruta Profile

Takehiro Tsuruta

at Takenaka Corp

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Proceedings Article | 1 June 2020 Paper

An estimation method of the camera fluctuation for a video-based vibration measurement

Kazuyuki Miura, Takehiro Tsuruta, Atsushi Osa

Proceedings Volume 11515, 115151E (2020) https://doi.org/10.1117/12.2566311

KEYWORDS: Cameras, Video, Buildings, Vibrometry, Spatial filters, Safety, Bandpass filters, Earthquakes, Sensors

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It is very important to assess buildings that have been subjected to earthquakes to determine their safety. In some regions, the emergency safety evaluation should be conducted within 24h after a huge earthquake has occurred. Some structural health monitoring systems enable rapid evaluation; however, they generally require many vibration sensors. Our research group studied a video-based micro-vibration measurement system that can evaluate the safety of buildings without vibration sensors. We propose an estimation method of the camera fluctuation for the video-based micro-vibration measurement system. The proposed method estimates the camera fluctuation as a global movement across the entire image. Thus, the method finds a group of pixels with a mode of spatial motion using the time difference of the spatial phase. Then, the time-variant signals of the mode pixels are estimated as the camera fluctuation. We found that the proposed method can estimate the camera vibration frequency under conditions where multiple objects exist within the angle of view.

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