A device for synchronizing biomechanical data with cine film.
A device for synchronizing biomechanical data with cine film.
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一种将生物力学数据与电影胶片同步的装置。
DOI：
10.1016/0021-9290(94)00063-a
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发表时间：
1995
影响因子：
2.4
通讯作者：
Rome,LC
中科院分区：
文献类型：
--
作者：
Rome,LC
生物力学学家在将连续的生理数据与来自电影的离散的、基于帧的运动学数据同步时面临两个问题。首先，大多数同步技术的精度仅适用于一帧，因此取决于帧速率。其次，即使在“拍摄”开始时完全相关，随着“拍摄”的进行，电影和生理数据也可能逐渐变得不同步。描述了一种系统，该系统提供电影胶片和连续生理数据之间的同步，精度为 ± 0.2 毫秒，与帧速率和电影“拍摄”的持续时间无关。来自相机的快门脉冲被输出到计算机记录系统，在计算机记录系统中对脉冲进行记录和计数，并输出到数字设备，该数字设备对脉冲进行计数并照亮与拍摄对象一起拍摄的 LED 组上的计数。通过使用快门脉冲的上升沿并将印在胶片上的帧数与计算机系统记录的帧数进行比较来执行同步。除了在长电影“拍摄”过程中提供高精度同步之外，该系统还具有其他几个优点。首先，将帧号印在胶片和计算机记录上极大地方便了分析。其次，LED 设计用于在摄像机加速时显示“拍摄编号”，从而避免使用可能干扰动物的提示卡。最后，使用该设备可以节省大量胶片。
Biomechanists are faced with two problems in synchronizing continuous physiological data to discrete, frame-based kinematic data from films. First, the accuracy of most synchronization techniques is good only to one frame and hence depends on framing rate. Second, even if perfectly correlated at the beginning of a ‘take’, the film and physiological data may become progressively desynchronized as the ‘take’ proceeds. A system is described, which provides synchronization between cine film and continuous physiological data with an accuracy of ± 0.2 ms, independent of framing rate and the duration of the film ‘take’. Shutter pulses from the camera were output to a computer recording system where they were recorded and counted, and to a digital device which counted the pulses and illuminated the count on the bank of LEDs which was filmed with the subject. Synchronization was performed by using the rising edge of the shutter pulse and by comparing the frame number imprinted on the film to the frame number recorded by the computer system. In addition to providing highly accurate synchronization over long film ‘takes’, this system provides several other advantages. First, having frame numbers imprinted both on the film and computer record greatly facilitates analysis. Second, the LEDs were designed to show the ‘take number’ while the camera is coming up to speed, thereby avoiding the use of cue cards which may disturb the animal. Finally, use of this device results in considerable savings in film.
影响因子：
56.9
作者：
LUTZ, GJ;ROME, LC
通讯作者：
ROME, LC
影响因子：
56.9
作者：
ROME, LC;SWANK, D;CORDA, D
通讯作者：
CORDA, D