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A method to synchronise video cameras using the audio band
Ricardo Machado Leite de Barros1, Tiago Guedes Russomanno, René Brenzikofer
1Laboratório de Instrumentação para Biomecânica , Faculdade de Educação Física, Universidade Estadual de Campinas, CX 6134, CEP 13083-970 Campinas, Brazil. ricardo@fef.unicamp.br
Journal of Biomechanics
|January 28, 2006
Summary
This study introduces a novel audio-band synchronization method for video cameras. The technique enhances 3D reconstruction accuracy and offers simplicity and broad applicability for precise motion capture.
Area of Science:
- Engineering
- Computer Vision
- Signal Processing
Background:
- Accurate video camera synchronization is crucial for 3D reconstruction and motion analysis.
- Existing synchronization methods can be complex or limited in applicability.
Purpose of the Study:
- To propose and evaluate a novel method for synchronizing video cameras using audio signals.
- To assess the accuracy, simplicity, and applicability of the proposed audio-band synchronization technique.
Main Methods:
- Generating and transmitting an audio signal via radio frequency to camera microphones.
- Calculating phase differences between video signals in a software environment.
- Using phase differences for interpolating synchronous 2D trajectory projections.
Main Results:
- Phase differences exhibited slow (0.150 ms/min) and linear changes over time.
- High equivalence between proposed method and oscilloscope measurements (R²=0.998).
- Statistically significant improvement in 3D reconstruction accuracy was observed.
Conclusions:
- The audio-band synchronization method is accurate, simple, and widely applicable.
- The technique provides reliable synchronization for video cameras.
- This method offers a significant advancement for motion capture and analysis.