im_sign(3) im_sign(3)
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)
July 2002 im_sign(3)
im_sign 7.14.5 - Generated Mon Sep 8 20:21:13 CDT 2008