linux man page for pgmedge

Query: pgmedge

OS: linux

Section: 1

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

pgmedge(1)						      General Commands Manual							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)
Related Man Pages
fstopgm(1) - minix
pgmedge(1) - minix
fstopgm(1) - opensolaris
pgmedge(1) - freebsd
pnmdepth(1) - freebsd
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