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im_zerox - find the zero crossings of an image
#include <vips/vips.h>
int im_zerox(in, out, flag)
IMAGE *in, *out;
int flag;
im_zerox() detects the positive and negative edges
of zero crossings of an image held by the image descriptor in, depending
on the flag.
If flag is -1 the negative zero crossings are returned. If flag
is 1 the positive zero crossings are returned.
The output image is byte
with zero crossing set to 255 and all other values set to zero. Input can
have any number of channels, and be any non-complex type.
The
function returns 0 on success and -1 on error.
im_conv(3)
.
N.
Dessipris
N. Dessipris - 14/05/1991
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