Name

fpol - interpolate up the input image using padding with zeroes in Fourier space

Usage

output = fpol(image,nnx, nny, nnz, RetReal)

Input

image

image to be interpolated.

nnx

new nx dimension

nny

new ny dimension (default = 0, meaning equal to the original ny)

nnz

new nz dimension (default = 0, meaning equal to the original nz)

RetReal

Logical flag, if True, the returned image is real, if False, it is Fourier

• Note: the new dimensions have to be larger/equal to the old dimensions (otherwise, this command cannot reduce the image size).

Output

output

the output interpolated up image

Description

The FFT of the input image is create, padded with zero to correspond to the new requested image size. The apdding is done such that the total energy of the inpterpolated image is preserved, but the new values on the old grid or not equal to the old values.

Author / Maintainer

Pawel A. Penczek

Keywords

category 1

FUNDAMENTALS

category 2

FOURIER

Files

fundamentals.py

Maturity

stable

works for most people, has been tested; test cases/examples available.

Bugs

None. It is perfect.