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- Article name
- OPTICAL MICRO-VIBRATION REGISTRATION USING THE PHASE-CORRELATION METHOD
- Authors
- Gevorkyan G. K., , gevorkiangosha@mail.ru, MIREA - Russian Technological University, Moscow, Russia
- Keywords
- phase correlation / micro-vibrations / contact-less measurement / optical method / video sequences / fast Fourier transform / cross-spectrum / frame alignment
- Year
- 2025 Issue 3 Pages 3 - 6
- Code EDN
- QPQUEV
- Code DOI
- 10.52190/1729-6552_2025_3_3
- Abstract
- This article investigates the phase-correlation method for contact-less optical registration of micro-vibrations from high-frame-rate video. The theoretical background namely the Fourier shift theorem and the construction of a normalized cross-spectrum is presented together with a practical algorithm that includes image pre-processing, fast Fourier transform (FFT) calculation and peak detection in the correlation domain. Typical applications are discussed: video-frame alignment, temporal-shift estimation for vibration-signal extraction, and the so-called visual microphone. Advantages (robustness to noise and illumination changes, FFT efficiency) and limitations (restricted accuracy without sub-pixel refinement, reduced performance for non-uniform motion) are analysed, demonstrating that phase correlation is a simple yet effective tool for video-based micro-vibration monitoring.
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