Abstract
Photogrammetry has become an effective method for the determination of electroencephalography (EEG) electrode positions in three dimensions (3D). Capturing multi-angle images of the electrodes on the head is a fundamental objective in the design of photogrammetry system for EEG localization. Methods in previous studies are all based on the use of either a rotating camera or multiple cameras, which are time-consuming or not cost-effective. This study aims to present a novel photogrammetry system that can realize simultaneous acquisition of multi-angle head images in a single camera position. Aligning two planar mirrors with the angle of 51.4°, seven views of the head with 25 electrodes are captured simultaneously by the digital camera placed in front of them. A complete set of algorithms for electrode recognition, matching, and 3D reconstruction is developed. It is found that the elapsed time of the whole localization procedure is about 3 min, and camera calibration computation takes about 1 min, after the measurement of calibration points. The positioning accuracy with the maximum error of 1.19 mm is acceptable. Experimental results demonstrate that the proposed system provides a fast and cost-effective method for the EEG positioning.
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Acknowledgments
We thank Department of Precision Machinery and Precision Instrumentation in University of Science and Technology of China for the CMM data collection. We also thank Guangping Fei, Xuan Yao, and Jianting Wang for their helps related to camera calibration and electrode recognition.
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Associate Editor Berj L. Bardakjian oversaw the review of this article.
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Qian, S., Sheng, Y. A Single Camera Photogrammetry System for Multi-angle Fast Localization of EEG Electrodes. Ann Biomed Eng 39, 2844–2856 (2011). https://doi.org/10.1007/s10439-011-0374-6
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DOI: https://doi.org/10.1007/s10439-011-0374-6