Ms. Jiangwei Xiao Profile

Jiangwei Xiao

at South China Normal Univ

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Proceedings Article | 12 January 2018 Paper

Extracting information of fixational eye movements through pupil tracking

JiangWei Xiao, Jian Qiu, Kaiqin Luo, Li Peng, Peng Han

Proceedings Volume 10620, 106201R (2018) https://doi.org/10.1117/12.2295581

KEYWORDS: Eye, Cameras, Mirrors, Infrared cameras, Infrared radiation, Beam splitters, Light sources, Video, High speed cameras, Digital cameras

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Human eyes are never completely static even when they are fixing a stationary point. These irregular, small movements, which consist of micro-tremors, micro-saccades and drifts, can prevent the fading of the images that enter our eyes. The importance of researching the fixational eye movements has been experimentally demonstrated recently. However, the characteristics of fixational eye movements and their roles in visual process have not been explained clearly, because these signals can hardly be completely extracted by now. In this paper, we developed a new eye movement detection device with a high-speed camera. This device includes a beam splitter mirror, an infrared light source and a high-speed digital video camera with a frame rate of 200Hz. To avoid the influence of head shaking, we made the device wearable by fixing the camera on a safety helmet. Using this device, the experiments of pupil tracking were conducted. By localizing the pupil center and spectrum analysis, the envelope frequency spectrum of micro-saccades, micro-tremors and drifts are shown obviously. The experimental results show that the device is feasible and effective, so that the device can be applied in further characteristic analysis.

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