fft_filter: Apply fft filter

In tsuda16k/pictplot: Image processing functions

Apply fft filter

Description

Apply fft filter

Usage

fft_filter(im, xpass, kernel = "ideal", cutoff, cutoff2, order = 4)

Arguments

im	an image
xpass	either "lowpass", "highpass", or "bandpass"
kernel	either "ideal", "gauss", "butterworth", or "dc"
cutoff	cutoff frequency
cutoff2	second cutoff frequency
order	order of butterworth filter

Value

an image

Examples

plot(fft_filter(regatta, "lowpass", "ideal", 10)) # ideal lowpass filterig
plot(fft_filter(regatta, "lowpass", "gauss", 10)) # gaussian lowpass filterig
# 5th-order butterworth lowpass filtering
plot(fft_filter(regatta, "lowpass", "butterworth", 10, order = 5))
im = im_gray(regatta)
plot(fft_filter(im, "highpass", "gauss", 60), rescale = TRUE) # gaussian highpass filterig
plot(fft_filter(im, "bandpass", "gauss", 10, 20), rescale = TRUE) # gaussian bandpass filterig

tsuda16k/pictplot documentation built on March 1, 2023, 8:44 p.m.