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)
Check Out this Related Man Page
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)
Hi, i have a file like this:
A1
kdfjdljfdkljfdlf
A2
lfjdlfkjddkjf
A3
***no hit***
A4
ldjfldjfdk
A5
***no hit***
A6
jldfjdlfjdlkfjd
I want to remove the lines "***no hit*** and their above line to get an output file like this: (11 Replies)
Not my story, but interesting enough to be worth posting here IMHO. (Original is here)
The following is the 500-mile email story in the form it originally appeared, in a post to sage-members on Sun, 24 Nov 2002.:
From trey@sage.org Fri Nov 29 18:00:49 2002
Date: Sun, 24 Nov 2002 21:03:02... (3 Replies)
Hi everyone,
I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX.
Ok onto business, my questions are-:
Was/Is UNIX ever an open source operating system ?
If UNIX was... (21 Replies)
Hi gurus,
I have a weird requirement. I need to convert the number to english lecture.
I have 1.2 ....19 numbers
I need to convert to first second third fourth, fifth, sixth...
Is there any way convert it using unix command?
thanks in advance. (8 Replies)
Hi,
Humorous UNIX Commands shows a fun way of using echo and dc to sort of obfuscate a string.
% echo 'sasb3135071790101768542287578439snlbxq'|dc
GET A LIFE!
I am just wanting to know if there is a way to sort of use dc and echo to print out an obfuscated/garbled string instead... (3 Replies)
Hi All,
Having recently started a new job, a Data Center Migration in fact I have been tasked with looking at some of the older Solaris boxes when I came across this little gem.
nismas# uname -a
SunOS nismas 5.5.1 Generic_103640-27 sun4u sparc SUNW,Ultra-1
nismas# uptime
10:37am up 2900... (2 Replies)
For any SunOS 5.XX release, it appears prior to the "login:" prompt (as if a "uname" command is run).
Would anyone know where that initial display of SunOS release comes from upon a remote login and how I can stop if from displaying?
Thank you (4 Replies)
I am trying to remove each line in which $2 is FP or RFP. I believe the below will remove one instance but not both. Thank you :).
file
12
123 FP
11
10 RFP
awk
awk -F'\t' '
$2 != "FP"' file
desired output
12
11 (6 Replies)
Hi everybody,
Which Unix base OS have best performance for HOST virtualization?
I tested SmartOS but it needs another OS to connect remotely!
Thanks in advance. (11 Replies)
I have this file:
>ID1
AA
>ID2
TTTTTT
>ID-3
AAAAAAAAA
>ID4
TTTTTTGGAGATCAGTAGCAGATGACAG-GGGGG-TGCACCCC
Add I am trying to use this script to output sequences longer than 15 characters:
sed -r '/^>/N;{/^.{,15}$/d}'
The desire output would be this:
>ID4... (8 Replies)
Hi,
I am having contents in a file like below,
cat testfile
rpool/swap
rpool/swap14
rpool/swap2
rpool/swap3
I want to sort the above contents like,
rpool/swap
rpool/swap2
rpool/swap3
rpool/swap14
I have tried in this way, (7 Replies)
Morning All
So, I am starting looking into the world of UNIX for a new job (luckily not my primary function!) and I am looking to get stared. Like anything I seem to learn best by trying things out first in an environment but I have a key question:
Currently I use Oracle VirtualBox, can... (8 Replies)