fshrink2 Shrink a Fimage to dimensions power of two
fshrink2 in out
in : input Fimage
out : shrinked Fimage
void fshrink2 (in , out )
Fimage in , out ;
This module is required for the 2D Fast Fourier transform (fft2d). It extracts of an input image its largest centered part which dimensions are power of 2. For example, an original image of size 600×300 will be shrinked to size 512×256, by extracting the part [44, 555]×[22, 277].
NB: Calling this C-subroutine with out = in is nonsense.
Last Modification date : Thu Nov 29 20:23:56 2001