从EyeLink 1000中过滤眼动追踪数据:比较启发式、savitzky-golay、IIR和FIR数字滤波器

IF 1.3 4区 心理学 Q3 OPHTHALMOLOGY
Mehedi Hasan Raju, Lee Friedman, Troy Bouman, Oleg Komogortsev
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引用次数: 2

摘要

在之前的报告(Raju et al., 2023)中,我们得出结论,如果目标是在眼动追踪记录中保留诸如扫视、微扫视和平滑追踪等事件,那么正弦波频率低于75 Hz的数据是信号,高于75 Hz的数据是噪声。在这里,我们比较了五种滤波器保持信号和去除噪声的能力。我们比较了我们的EyeLink 1000 (SR-Research, Ottawa, Canada)提供的专有STD和EXTRA启发式滤波器、Savitzky-Golay (SG)滤波器、无限脉冲响应(IIR)滤波器(低通Butterworth)和有限脉冲滤波器(FIR)。对于每个非启发式过滤器,我们系统地搜索最优参数。IIR滤波器和FIR滤波器都是零相位滤波器。所有过滤器在9个受试者的216个固定段(256个样本)上进行评估。给出了五种滤波器的平均频率响应曲线和振幅谱。此外,我们还检查了我们的过滤器对嘈杂录音的影响。我们的FIR滤波器具有所有滤波器中最大的滚降。因此,它比任何其他滤波器更有效地保持了信号并去除了噪声。在此基础上,我们建议使用我们的FIR滤波器。我们还报道了这些滤波器对时间自相关的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Filtering eye-tracking data from an EyeLink 1000: Comparing heuristic, savitzky-golay, IIR and FIR digital filters
In a prior report (Raju et al., 2023) we concluded that, if the goal was to preserve events such as saccades, microsaccades, and smooth pursuit in eye-tracking recordings, data with sine wave frequencies less than 75 Hz were the signal and data above 75 Hz were noise. Here, we compare five filters in their ability to preserve signal and remove noise. We compared the proprietary STD and EXTRA heuristic filters provided by our EyeLink 1000 (SR-Research, Ottawa, Canada), a Savitzky-Golay (SG) filter, an infinite impulse response (IIR) filter (low-pass Butterworth), and a finite impulse filter (FIR). For each of the non-heuristic filters, we systematically searched for optimal parameters. Both the IIR and the FIR filters were zero-phase filters. All filters were evaluated on 216 fixation segments (256 samples), from nine subjects. Mean frequency response profiles and amplitude spectra for all five filters are provided. Also, we examined the effect of our filters on a noisy recording. Our FIR filter had the sharpest roll-off of any filter. Therefore, it maintained the signal and removed noise more effectively than any other filter. On this basis, we recommend the use of our FIR filter. We also report on the effect of these filters on temporal autocorrelation.
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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,
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