CentOS 7.0 - man page for pamedge (centos section 0)
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Pamedge User Manual(0) Pamedge User Manual(0)
pamedge - edge-detect an image
This program is part of Netpbm(1)
pamedge reads a Netpbm image (PNM or PAM) and produces an image that outlines the edges.
The output image is of the same type as the input, except that the maxval of the output is
at least 255 and if the input is PBM, the output is PGM.
You can pipe the result through pamditherbw -threshold and play with the threshold value
to get a PBM (bilevel image) 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, except at least 255. The
effect is better with larger maxvals, so you may want to increase the maxval of the input
by running it through pamdepth first.
pgmenhance(1) , pamditherbw(1) , pamdepth(1) , pammasksharpen(1) , pamsharpness(1) ,
pamsharpmap(1) , pam(1) , pnm(1)
pamedge was added to Netpbm in Release 10.14 (March 2003). It replaced pgmedge, which was
the same thing, but worked only on PGM and PBM images.
Copyright (C) 1991 by Jef Poskanzer. Adapted to pnmedge Peter Kichgessner in 1995, and
then to pamedge by Bryan Henderson in 2003.
netpbm documentation 11 January 2003 Pamedge User Manual(0)
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