AFM (version 1.2.0)

shiftFFT2D: Shift the quadrants of the FFT 2D

Description

shiftFFT2D returns the FFT 2D matrix shifted to put zero frequencies in the middle.

Usage

shiftFFT2D(fft2data)

Arguments

fft2data

the FFT 2D of the AFM image

Value

• The shifted matrix

Examples

library(AFM)
library(fftwtools)

data(AFMImageOfNormallyDistributedHeights)
AFMImage<-AFMImageOfNormallyDistributedHeights
nMheightsData= matrix(AFMImage@data$h, nrow=AFMImage@samplesperline)
shiftedFFT2D<-shiftFFT2D(fftw2d(nMheightsData))