使用自然头部运动持续校准EOG信号。

IF 1.3 4区 心理学 Q3 OPHTHALMOLOGY Journal of Eye Movement Research Pub Date : 2022-12-30 eCollection Date: 2022-01-01 DOI:10.16910/jemr.15.5.6
Jason R Nezvadovitz, Hrishikesh M Rao
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引用次数: 0

摘要

眼电图(EOG)是使用附着在眼睛周围的表面电极来测量眼睛的运动。EOG系统可以设计为具有不引人注目的形状因子,这对于长时间自由生活中的眼睛跟踪来说是理想的,但电压和凝视方向之间的关系需要频繁的重新校准,因为皮肤电极阻抗和视网膜适应随时间变化。在这里,我们提出了一种方法,通过在前庭-眼反射(VOR)激活时将EOG信号与头部运动的陀螺仪测量融合,自动校准EOG凝视关系。融合作为隐马尔可夫模型的递归推理执行,隐马尔可夫模型同时考虑所有旋转自由度和不确定性。这使得能够使用自然的眼睛和头部运动进行连续校准,同时最大限度地减少传感器噪声的影响。不需要像监视器或摄像机这样的外部设备。平均而言,我们的方法的凝视估计与基于行业标准桌面视频的眼动仪的凝视估计偏差3.54°。这种差异与最新的移动视频眼动仪不相上下。未来的工作重点是自动检测自由生活中的VOR时刻。
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Using Natural Head Movements to Continually Calibrate EOG Signals.

Electrooculography (EOG) is the measurement of eye movements using surface electrodes adhered around the eye. EOG systems can be designed to have an unobtrusive form-factor that is ideal for eye tracking in free-living over long durations, but the relationship between voltage and gaze direction requires frequent re-calibration as the skin-electrode impedance and retinal adaptation vary over time. Here we propose a method for automatically calibrating the EOG-gaze relationship by fusing EOG signals with gyroscopic measurements of head movement whenever the vestibulo-ocular reflex (VOR) is active. The fusion is executed as recursive inference on a hidden Markov model that accounts for all rotational degrees-of-freedom and uncertainties simultaneously. This enables continual calibration using natural eye and head movements while minimizing the impact of sensor noise. No external devices like monitors or cameras are needed. On average, our method's gaze estimates deviate by 3.54° from those of an industry-standard desktop video-based eye tracker. Such discrepancy is on par with the latest mobile video eye trackers. Future work is focused on automatically detecting moments of VOR in free-living.

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来源期刊
CiteScore
2.90
自引率
33.30%
发文量
10
审稿时长
10 weeks
期刊介绍: The Journal of Eye Movement Research is an open-access, peer-reviewed scientific periodical devoted to all aspects of oculomotor functioning including methodology of eye recording, neurophysiological and cognitive models, attention, reading, as well as applications in neurology, ergonomy, media research and other areas,
期刊最新文献
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