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im_sign - find the unit vector in the direction of value
#include
<vips/vips.h>
int im_sign( in, out )
IMAGE *in, *out;
im_sign(3)
finds the unit vector in the direction
of the pixel value. For non-complex images, it returns a signed char image
with values -1, 0, and 1 for negative, zero and positive pixels. For complex
images it returns a complex normalised to length 1.
The function
returns 0 on success and -1 on error.
im_abs(3)
, im_cmulnorm(3)
,
im_c2amph(3)
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