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首页> 外文期刊>Journal of Biomechanics >Accuracy of an optical active-marker system to track the relative motion of rigid bodies.
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Accuracy of an optical active-marker system to track the relative motion of rigid bodies.

机译：光学有源标记系统跟踪刚体相对运动的准确性。

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摘要

The measurement of relative motion between two moving bones is commonly accomplished for in vitro studies by attaching to each bone a series of either passive or active markers in a fixed orientation to create a rigid body (RB). This work determined the accuracy of motion between two RBs using an Optotrak optical motion capture system with active infrared LEDs. The stationary noise in the system was quantified by recording the apparent change in position with the RBs stationary and found to be 0.04 degrees and 0.03 mm. Incremental 10 degrees rotations and 10-mm translations were made using a more precise tool than the Optotrak. Increasing camera distance decreased the precision or increased the range of values observed for a set motion and increased the error in rotation or bias between the measured and actual rotation. The relative positions of the RBs with respect to the camera-viewing plane had a minimal effect on the kinematics and, therefore, for a given distance in the volume less than or close to the precalibrated camera distance, any motion was similarly reliable. For a typical operating set-up, a 10 degrees rotation showed a bias of 0.05 degrees and a 95% repeatability limit of 0.67 degrees. A 10-mm translation showed a bias of 0.03 mm and a 95% repeatability limit of 0.29 mm. To achieve a high level of accuracy it is important to keep the distance between the cameras and the markers near the distance the cameras are focused to during calibration.
机译：通常在体外研究中通过在固定在每个骨骼上附着一系列被动或主动标记以创建刚体（RB）的方式来完成两个运动骨骼之间相对运动的测量。这项工作使用带有源红外LED的Optotrak光学运动捕捉系统确定了两个RB之间运动的准确性。通过记录RB静止时的表观位置变化来量化系统中的静止噪声，发现其为0.04度和0.03 mm。使用比Optotrak更精确的工具进行增量10度旋转和10毫米平移。增大相机距离会降低设置运动的精度或增加所观察到的值的范围，并会增加旋转误差或所测旋转与实际旋转之间的偏差。 RB相对于摄像机观察平面的相对位置对运动学的影响最小，因此，对于体积小于或接近于预先校准的摄像机距离的给定距离，任何运动都同样可靠。对于典型的操作设置，旋转10度会显示0.05度的偏差和0.67度的95％可重复性极限。 10毫米平移显示0.03毫米的偏差和0.29毫米的95％重复性极限。为了获得较高的精度，重要的是要使相机和标记之间的距离保持在校准过程中相机聚焦的距离附近。

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