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Matrix parsing help !
Post 302586828 by ctsgnb on Tuesday 3rd of January 2012 11:19:06 AM
01-03-2012
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LEARN ABOUT FREEBSD
pgmedge
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)