Nothing
##
## fft_filter: fftw interface
##
## $Header: /database/repository/rimage/R/fft_filter.R,v 1.4.2.5 2004/03/17 06:35:05 tomo Exp $
##
## Copyright (c) 2003 Nikon Systems Inc.
## For complete license terms see file LICENSE
fftw <- function(img, dir = -1, debug=FALSE) {
h <- dim(img)[1]
w <- dim(img)[2]
matrix(.C("fftw_access_func",
as.complex(img),
as.integer(w),
as.integer(h),
as.integer(dir),
as.integer(debug),
spec = complex(w*h),
PACKAGE="ripa"
)$spec, nrow=dim(img)[1], ncol=dim(img)[2])
}
fftImg <- function(img) {
img.fft <- normalize(imagematrix(log1p(Mod(fftw(img, -1))), noclipping=TRUE))
# reordering
w <- dim(img)[2]
h <- dim(img)[1]
imagematrix(img.fft[c(ceiling(h/2):h,1:(ceiling(h/2)-1)),
c(ceiling(w/2):w, 1:(ceiling(w/2)-1))], noclipping=TRUE)
}
## the end of file
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