Name

prepg - prepare 2-D image for rotation/shift using gridding method.

Usage

• nx = image.get_xsize()
• kb = kbt(nx)
• imageft = prepg(image, kb)

Input

image

input image that is going to be rotated and shifted using rtshgkb

kb

interpolants (tabulated Kaiser-Bessel function)

Output

imageft

image prepared for gridding rotation and shift

Method

Fourier space interpolation.

Reference

Penczek, P.A., Renka, R. and Schomberg, H.: Gridding-based direct Fourier inversion of the three-dimensional ray transform. J. Opt. Soc. Am. A. 21:499-509, 2004.

Author / Maintainer

Pawel A. Penczek

Keywords

category 1

FUNDAMENTALS

category 2

FOURIER

Files

fundamentals.py

See also

rtshgkb, prepi

Maturity

stable

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

Bugs

None. It is perfect.