1IM_ZEROX(3)                Library Functions Manual                IM_ZEROX(3)
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NAME

6       im_zerox - find the zero crossings of an image
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SYNOPSIS

9       #include <vips/vips.h>
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11       int im_zerox(in, out, flag)
12       IMAGE *in, *out;
13       int flag;
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DESCRIPTION

17       im_zerox() detects the positive and negative edges of zero crossings of
18       an image held by the image descriptor in, depending on the flag.
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20       If flag is -1 the negative zero crossings are returned.  If flag  is  1
21       the positive zero crossings are returned.
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23       The  output  image  is byte with zero crossing set to 255 and all other
24       values set to zero. Input can have any no of channels, and be any  non-
25       complex type.
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RETURN VALUE

29       The function returns 0 on success and -1 on error.
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SEE ALSO

32       im_conv(3).
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35       N. Dessipris
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AUTHOR

38       N. Dessipris - 14/05/1991
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42                                  14 May 1991                      IM_ZEROX(3)
Impressum