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im_rotquad - rotates the four quadrants of an image
#include
<vips/vips.h>
int im_rotquad(in, out)
IMAGE *in, *out;
im_rotquad rotates the four quadrants of the
image held by the image descriptor in and writes the result on the image
descriptor out.
The function is used primarily to rotate a fourier transform
in such a way that the coordinate (0,0) is near the centre of the image,
the so-called optical transform.
The function operates on any input; output
has the same format, sizes and bands as input.
The function
returns 0 on success and -1 on error.
im_fwfft(3)
, im_invfft(3)
,
im_scaleps(3)
.
N. Dessipris
N. Dessipris - 06/07/1990
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