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im_zerox(3)                                                        im_zerox(3)




NAME

       im_zerox - find the zero crossings of an image


SYNOPSIS

       #include <vips/vips.h>

       int im_zerox(in, out, flag)
       IMAGE *in, *out;
       int flag;



DESCRIPTION

       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.



RETURN VALUE

       The function returns 0 on success and -1 on error.


SEE ALSO

       im_conv(3).


COPYRIGHT

       N. Dessipris


AUTHOR

       N. Dessipris - 14/05/1991



                                  14 May 1991                      im_zerox(3)

im_zerox 7.14.5 - Generated Tue Sep 9 10:36:34 CDT 2008
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