1IM_ROTQUAD(3)              Library Functions Manual              IM_ROTQUAD(3)
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NAME

6       im_rotquad - rotates the four quadrants of an image
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SYNOPSIS

9       #include <vips/vips.h>
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11       int im_rotquad(in, out)
12       IMAGE *in, *out;
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DESCRIPTION

15       im_rotquad  rotates  the  four quadrants of the image held by the image
16       descriptor in and writes the result on the image descriptor out.
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18       The function is used primarily to rotate a fourier transform in such  a
19       way  that the coordinate (0,0) is near the centre of the image, the so-
20       called optical transform.
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22       The function operates on any input; output has the same  format,  sizes
23       and bands as input.
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RETURN VALUE

26       The function returns 0 on success and -1 on error.
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SEE ALSO

29       im_fwfft(3), im_invfft(3), im_scaleps(3).
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32       N. Dessipris
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AUTHOR

35       N. Dessipris - 06/07/1990
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39                                 07 July 1990                    IM_ROTQUAD(3)
Impressum