This is an internal function and not to be used stand-alone.
rspectrum(x, w, hm, n = TRUE, h = TRUE, env, ...)
a square matrix
a moving window size
harmonics to consider as features
normalize, bolean TRUE
or FALSE
high pass filter on the two first spectra values
set to 0, limits the influence of low frequency components
bolean TRUE
or FALSE
local environment to evaluate
additional parameters to forward
Returns a radial spectrum values for the image used in order to classify texture using a PCA (or other) analysis.