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Spatial Localization of EEG Electrodes in a TOF+CCD Camera System

机译:TOF + CCD摄像头系统中脑电电极的空间定位

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摘要

A crucial link of electroencephalograph (EEG) technology is the accurate estimation of EEG electrode positions on a specific human head, which is very useful for precise analysis of brain functions. Photogrammetry has become an effective method in this field. This study aims to propose a more reliable and efficient method which can acquire 3D information conveniently and locate the source signal accurately in real-time. The main objective is identification and 3D location of EEG electrode positions using a system consisting of CCD cameras and Time-of-Flight (TOF) cameras. To calibrate the camera group accurately, differently to the previous camera calibration approaches, a method is introduced in this report which uses the point cloud directly rather than the depth image. Experimental results indicate that the typical distance error of reconstruction in this study is 3.26 mm for real-time applications, which is much better than the widely used electromagnetic method in clinical medicine. The accuracy can be further improved to a great extent by using a high-resolution camera.
机译:脑电图(EEG)技术的关键环节是准确估计特定人头上EEG电极的位置,这对于精确分析大脑功能非常有用。摄影测量学已成为该领域的有效方法。这项研究旨在提出一种更可靠,更有效的方法,该方法可以方便地获取3D信息并实时准确地定位源信号。主要目标是使用由CCD摄像头和飞行时间(TOF)摄像头组成的系统对EEG电极位置进行识别和3D定位。为了准确校准摄像机组,与以前的摄像机校准方法不同,本报告中介绍了一种方法,该方法直接使用点云而不是深度图像。实验结果表明,在实时应用中,该研究中典型的重建距离误差为3.26 mm,这比临床医学中广泛使用的电磁方法要好得多。通过使用高分辨率相机,可以在很大程度上进一步提高精度。

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