IM_SIGN
Section: C Library Functions (3)
Updated: July 2002
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NAME
im_sign - find the unit vector in the direction of value
SYNOPSIS
#include <vips/vips.h>
int im_sign( in, out )
IMAGE *in, *out;
DESCRIPTION
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.
RETURN VALUE
The function returns 0 on success and -1 on error.
SEE ALSO
im_abs(3), im_cmulnorm(3), im_c2amph(3)