lpfilt_pupil: Internal function to lowpass filter pupil data

In eyeris: Flexible, Extensible, & Reproducible Pupillometry Preprocessing

Internal function to lowpass filter pupil data

Description

This function lowpass filters pupil data using a Butterworth filter.

This function is called by the exposed wrapper lpfilt()

Usage

lpfilt_pupil(x, prev_op, wp, ws, rp, rs, fs, plot_freqz)

Arguments

x	A data frame containing pupil data
prev_op	The name of the previous operation in the pipeline
wp	The end of passband frequency in Hz (desired lowpass cutoff)
ws	The start of stopband frequency in Hz (required lowpass cutoff)
rp	Required maximal ripple within passband in dB
rs	Required minimal attenuation within stopband in dB
fs	The sample rate of the data
plot_freqz	A flag to indicate whether to display the filter frequency response

Value

A vector of filtered pupil data

eyeris documentation built on July 3, 2025, 9:08 a.m.