im_sign3
Find the unit vector in the direction of value
Usage
#include <vips/vips.h>
int im_sign( in, out )
IMAGE *in, *out;
Overview
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.
Releases
Unchanged in 4 releases since Debian 3.1 (Sarge).