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## $Header: /database/repository/rimage/R/freq.R,v 1.1.2.3 2004/03/17 06:35:18 tomo Exp $
##
## Copyright (c) 2003 Nikon Systems Inc.
## For complete license terms see file LICENSE
lowpass <- function(img, radius=40) {
## computes a low pass
## image is just for giving dimensions
get.lp <- function(img, radius) {
h <- dim(img)[1]
w <- dim(img)[2]
matrix(.C("getLowPass",
as.double(img),
as.integer(w),
as.integer(h),
as.integer(radius),
spec = double(h*w),
PACKAGE="ripa"
)$spec, nrow=h, ncol=w)
}
if ( !is.na(dim(img)[3]) ){
img = rgb2grey(I)
}
h <- dim(img)[1]
w <- dim(img)[2]
p = planFFT(h*w)
fft <- matrix(FFT(as.vector(t(img)), plan=p),nrow=h,ncol=w)
t1 <- rbind(fft,fft)
t2 <- cbind(t1,t1)
x1 <- dim(fft)[1]/2 + 1
x2 <- 1.5*dim(fft)[1]
y1 <- dim(fft)[2]/2 + 1
y2 <- 1.5*dim(fft)[2]
fft <- t2[ x1:x2 , y1:y2 ]
lp <- get.lp(img, radius)
filtered <- fft*lp
ifft <- matrix(IFFT(as.vector(t(filtered)),p),nrow=h,ncol=w)
out1 = imagematrix(abs(ifft))
#img = rgb2grey(I)
}
highpass <- function(img, radius=40) {
## computes high pass
get.hp <- function(img, radius) {
h <- dim(img)[1]
w <- dim(img)[2]
matrix(.C("getHighPass",
as.double(img),
as.integer(w),
as.integer(h),
as.integer(radius),
spec = double(w*h),
PACKAGE="ripa"
)$spec, nrow=dim(img)[1], ncol=dim(img)[2])
}
if (!is.na(dim(img)[3])){
img = rgb2grey(I)
}
h <- dim(img)[1]
w <- dim(img)[2]
p = planFFT(h*w)
fft <- matrix(FFT(as.vector(t(img)), plan=p),nrow=h,ncol=w)
t1 <- rbind(fft,fft)
t2 <- cbind(t1,t1)
x1 <- dim(fft)[1]/2 + 1
x2 <- 1.5*dim(fft)[1]
y1 <- dim(fft)[2]/2 + 1
y2 <- 1.5*dim(fft)[2]
fft <- t2[ x1:x2 , y1:y2 ]
hp <- get.hp(img, radius)
filtered <- fft*hp
ifft <- matrix(IFFT(as.vector(t(filtered)),p),nrow=h,ncol=w)
out1 = imagematrix(abs(ifft))
}
## the end of file
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