pgmedge man page on Tru64

pgmedge man page on Tru64

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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.

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

AUTHOR
       Copyright (C) 1991 by Jef Poskanzer.

			       04 February 1990			    pgmedge(1)

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