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% input file: fbedge.1
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\phead{FBEDGE}{1}{25-Jun-90}

%.CM 3
\shead{NAME}
fbedge -- compute the derivative of an image (edge detection)
\shead{SYNOPSIS}
\nofill
fbedge [ -t$<$threshhold$>$ ] [ -$<$type$>$ ] $<$ bitmap $>$ bitmap
\fill
\shead{DESCRIPTION}
\par
Computes a halftoned image composed of edges in the original.  Edge
detection is done by digital Laplacian.
%.SO OPTIONS
\begin{TPlist}{{\bf -t$<$num$>$}}
\item[{{\bf -t$<$num$>$}}]
{\it threshhold}
argument, specifies a threshhold for detecting edges.  Pixels with
first derivatives greater than the threshhold will be black, and others
will be white.
\item[{{\bf -B}
}]
{\it face}
format, as used by Bennet Yee's
{\it face}
program at CMU. 
\item[{{\bf -F}
}]
{\it FBM,}
format (by default, the default).  You are guaranteed not
to lose information by specifying FBM as the default.
\item[{{\bf -G}
}]
{\it GIF,}
Compuserve GIF format.
\item[{{\bf -I}
}]
{\it IFF}
format, interleaved bitmaps (ILBM), used by Amigas.
\item[{{\bf -P}
}]
{\it PBM,}
Jef Poskanzer's bitmap format.
\item[{{\bf -S}
}]
{\it sun,}
Sun rasterfiles (not run length encoded).
\end{TPlist}
\shead{EXAMPLE}
\par
To produce an image of regions in a grayscale image where the first
derivative is greater than 10, and output the result as a Sun
rasterfile:
\par\vspace{1.0\baselineskip}
    \% fbedge -t10 -S $<$ foo.gray $>$ foo.1bit
\shead{SEE ALSO}
fbm(1) for general discussion, pbm(1) for PBM routines.
\shead{BUGS}
None known.
\shead{HISTORY}
Copyright (C) 1989,1990 by Gary Sherwin \& Michael Mauldin.
Permission is granted to use this file in whole or in part for
any purpose, educational, recreational or commercial, provided
that this copyright notice is retained unchanged.  This software
is available to all free of charge by anonymous FTP and in the
UUNET archives.
\begin{TPlist}{25-Jun-90  Michael Mauldin at Carnegie Mellon University}
\item[{25-Jun-90  Michael Mauldin at Carnegie Mellon University}]
Release 1.0 mlm@cs.cmu.edu
\item[{07-Mar-89  Michael L. Mauldin at Carnegie Mellon University}]
Beta release (version 0.9) mlm@cs.cmu.edu
\end{TPlist}
\end{document}
