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首页> 外文期刊>Journal of Biomechanics >A method to synchronise video cameras using the audio band.
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A method to synchronise video cameras using the audio band.

机译：一种使用音频频带同步摄像机的方法。

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摘要

This paper proposes and evaluates a novel method for synchronisation of video cameras using the audio band. The method consists in generating and transmitting an audio signal through radio frequency for receivers connected to the microphone input of the cameras and inserting the signal in the audio band. In a software environment, the phase differences among the video signals are calculated and used to interpolate the synchronous 2D projections of the trajectories. The validation of the method was based on: (1) Analysis of the phase difference changes as a function of time of two video signals. (2) Comparison between the values measured with an oscilloscope and by the proposed method. (3) Estimation of the improvement in the accuracy in the measurements of the distance between two markers mounted on a rigid body during movement applying the method. The results showed that the phase difference changes in time slowly (0.150 ms/min) and linearly, even when the same model of cameras are used. The values measured by the proposed method and by oscilloscope showed equivalence (R2=0.998), the root mean square of the difference between the measurements was 0.10 ms and the maximum difference found was 0.31 ms. Applying the new method, the accuracy of the 3D reconstruction had a statistically significant improvement. The accuracy, simplicity and wide applicability of the proposed method constitute the main contributions of this work.
机译：本文提出并评估了一种使用音频频带同步摄像机的新方法。该方法包括通过射频为连接到摄像机的麦克风输入的接收器生成和发送音频信号，并将该信号插入音频频带。在软件环境中，视频信号之间的相位差将被计算并用于插值轨迹的同步2D投影。该方法的验证基于：（1）分析两个视频信号随时间变化的相位差变化。 （2）用示波器和提出的方法测量的值之间的比较。 （3）使用该方法，估计在移动过程中安装在刚体上的两个标记之间的距离的测量精度的提高。结果表明，即使使用相同型号的摄像机，相位差也会随时间缓慢变化（0.150 ms / min）并且呈线性变化。通过所提出的方法和示波器测量的值显示等效（R2 = 0.998），两次测量之间的差的均方根为0.10 ms，发现的最大差为0.31 ms。应用新方法，3D重建的准确性在统计上有显着提高。所提出的方法的准确性，简单性和广泛的适用性是这项工作的主要贡献。

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