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pgmedge
!!!pgmedge
NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHOR
----
!!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


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.
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Last edited on Tuesday, June 4, 2002 12:22:41 am by "perry"

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