Single Camera Photogrammetry System for Eeg Electrode Identification and Localization
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Date
2010
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Annals of Biomedical Engineering
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Abstract
In this study, photogrammetric coordinate measurement and color-based identification of EEG electrode
positions on the human head are simultaneously implemented. A rotating, 2MP digital camera about 20 cm above
the subject’s head is used and the images are acquired at
predefined stop points separated azimuthally at equal angular displacements. In order to realize full automation, the
electrodes have been labeled by colored circular markers and
an electrode recognition algorithm has been developed. The
proposed method has been tested by using a plastic head
phantom carrying 25 electrode markers. Electrode locations
have been determined while incorporating three different
methods: (i) the proposed photogrammetric method,
(ii) conventional 3D radiofrequency (RF) digitizer, and
(iii) coordinate measurement machine having about 6.5 lm
accuracy. It is found that the proposed system automatically
identifies electrodes and localizes them with a maximum
error of 0.77 mm. It is suggested that this method may be
used in EEG source localization applications in the human
brain.
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electrical & electronics engineering