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Name

im_rotquad - rotates the four quadrants of an image

Synopsis

#include <vips/vips.h>

int im_rotquad(in, out)
IMAGE *in, *out;

Description

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.

Return Value

The function returns 0 on success and -1 on error.

See Also

im_fwfft(3) , im_invfft(3) , im_scaleps(3) .

Copyright


N. Dessipris

Author

N. Dessipris - 06/07/1990


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