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

Kazuyuki Miura; Takehiro Tsuruta; Atsushi Osa

doi:10.1117/12.2566311

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1 June 2020 An estimation method of the camera fluctuation for a video-based vibration measurement

Kazuyuki Miura, Takehiro Tsuruta, Atsushi Osa

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Proceedings Volume 11515, International Workshop on Advanced Imaging Technology (IWAIT) 2020; 115151E (2020) https://doi.org/10.1117/12.2566311
Event: International Workshop on Advanced Imaging Technologies 2020 (IWAIT 2020), 2020, Yogyakarta, Indonesia

Abstract

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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Kazuyuki Miura, Takehiro Tsuruta, and Atsushi Osa "An estimation method of the camera fluctuation for a video-based vibration measurement", Proc. SPIE 11515, International Workshop on Advanced Imaging Technology (IWAIT) 2020, 115151E (1 June 2020); https://doi.org/10.1117/12.2566311

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