Measuring trunk orientation with a CMOS camera:: Feasibility and accuracy
Measuring trunk orientation with a CMOS camera:: Feasibility and accuracy
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DOI：
10.1016/j.gaitpost.2006.12.004
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发表时间：
2007-10-01
期刊：
影响因子：
2.4
通讯作者：
Perennou, D.
中科院分区：
文献类型：
--
作者：
Gissot, A.-S.;Barbieri, G.;Perennou, D.
本研究的目的是开发和验证一种新的工具，以客观地量化床边的躯干方向，特别是专门用于测量急性和亚急性脑卒中患者的侧推。我们开发了软件来分析二维运动与CMOS相机（罗技(R)） Quickcam Pro 4000)，并计算由两个颜色标记定义的部分的方向。首先，对不同位置CMOS摄像机测量线段方向时的精度、再现性和噪声进行了评估；其次，用CMOS摄像机和黄金标准3D视频系统（BTS SMART-e）在静态和动态条件下测量主干方向。结果表明，测量结果准确（平均误差= 0.05 0.12°），重复性好（5次测量标准差= 0.005°），稳定（噪声信号= 0.02°）。在静态和动态条件下，用CMOS相机获得的数据与三维视频系统获得的数据高度相关。然而，CMOS相机必须相对较好地居中于被测段，以避免由于图像失真造成的误差。视差误差可以忽略不计。总之，这可能是急性和亚急性脑卒中患者体位评估的重要一步。CMOS相机是一种简单、便携、紧凑、低成本、可商用的仪器，是第一个客观量化床边侧推的工具。这种方法还可以支持基于生物反馈的躯干定向康复计划的发展，利用设备提供的实时信号。(c) 2006 Elsevier B.V.版权所有
The purpose of this study was to develop and validate a new tool to objectively quantify trunk orientation at the bedside, especially dedicated to the measurement of the lateropulsion in acute and subacute stroke patients. We developed software to analyze 2D movement with a CMOS camera (Logitech (R)) Quickcam Pro 4000) and to calculate the orientation of a segment defined by two color markers. First, the accuracy, reproducibility and noise when measuring segment orientations were evaluated with the CMOS camera placed in different positions, and second trunk orientation was measured in static and in dynamic conditions both with a CMOS camera and with a gold standard 3D video system (BTS SMART-e). Results showed that the measurement was accurate (mean error = 0.05 0.12 degrees), reproducible (S.D. over five measurements = 0.005 degrees) and steady (noise signal = 0.02 degrees). The data obtained with the CMOS camera were highly correlated with those obtained with the 3D video system both in static and in dynamic conditions. However, the CMOS camera must be relatively well centered on the measured segment to avoid error due to image distortion. The parallax error was negligible. in conclusion, this could be an important step in the postural assessment of acute and subacute stroke patients. The CMOS camera, a simple, portable, compact, low-cost, commercially available apparatus is the first tool to objectively quantify lateropulsion at the bedside. This method could also support the development of a rehabilitation program for trunk orientation based on biofeedback using the real-time signal provided by the device. (c) 2006 Elsevier B.V. All rights reserved.