31 lines
772 B
Groff
31 lines
772 B
Groff
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.TH IM_ZEROX 3 "14 May 1991"
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.SH NAME
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im_zerox \- find the zero crossings of an image
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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int im_zerox(in, out, flag)
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.br
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IMAGE *in, *out;
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.br
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int flag;
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.SH DESCRIPTION
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im_zerox() detects the positive and negative edges of zero crossings of an
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image held by the image descriptor in, depending on the flag.
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If flag is -1 the negative zero crossings are returned.
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If flag is 1 the positive zero crossings are returned.
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The output image is byte with zero crossing set to 255 and all other values
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set to zero. Input can have any number of channels, and be any non-complex type.
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.SH RETURN VALUE
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The function returns 0 on success and -1 on error.
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.SH SEE ALSO
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im_conv(3).
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.SH COPYRIGHT
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N. Dessipris
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.SH AUTHOR
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N. Dessipris \- 14/05/1991
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