pgmedge man page on IRIX

pgmedge man page on IRIX

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pgmedge(1)					       pgmedge(1)

NAME
       pgmedge - edge-detect a portable graymap

SYNOPSIS
       pgmedge [pgmfile]

DESCRIPTION
       Reads  a	 portable  graymap as input.  Outlines the edges,
       and writes a  portable  graymap	as  output.   Piping  the
       result  through	pgmtopbm  -threshold and playing with the
       threshold value will give a bitmap of the edges.

       The  edge  detection  technique	used  is  to   take   the
       Pythagorean  sum	 of  two  Sobel	 gradient operators at 90
       degrees to each other.	For  more  details  see	 "Digital
       Image Processing" by Gonzalez and Wintz, chapter 7.

       The  maxval of the output is the same as the maxval of the
       input The effect is better with larger maxvals, so you may
       want  to	 increase  the	maxval of the input by running it
       through pnmdepth first.

SEE ALSO
       pgmenhance(1), pgmtopbm(1), pnmdepth(1), pgm(5), pbm(5)

AUTHOR
       Copyright (C) 1991 by Jef Poskanzer.

			 04 February 1990	       pgmedge(1)

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