Pamaddnoise User Manual(1) General Commands Manual Pamaddnoise User Manual(1)
NAME
pamaddnoise - add noise to a Netpbm image
SYNOPSIS
pamaddnoise { [-type gaussian]
[-sigma1 value]
[-sigma2 value] | -type multiplicative_gaussian
[-mgsigma value] | -type impulse
[-tolerance ratio] | -type laplacian
[-lsigma value] | -type poisson
[-lambda value] } [-seed int]
[netpbmfile]
DESCRIPTION
This program is part of Netpbm(1).
pamaddnoise adds the specified noise type to a Netpbm image. pa-
maddnoise treats a PPM image as 3 independent planes, not as a plane of
colors in a color space.
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), pamaddnoise recognizes
the following command line options:
-lambda value
This is the expected value of the Poisson distribution for a
sample value
of mximum intensity. The expected value for other intensities
is
proportional; e.g. for half intensity, it is half this value.
This is meaningful only with -type=poisson.
The default value is 12.
-lsigma value
Used for laplacian noise only. The default value is 10.0.
-mgsigma value
Used for multiplicative gaussian noise only. The default value
is 0.5.
-seed int
Used for all noise types. Set the initial random number genera-
tor seed value.
-sigma1 value
Used for gaussian noise only. The default value is 4.0.
-sigma2 value
Used for gaussian noise only. The default value is 20.0.
-tolerance ratio
Used for impulse noise only. The default value is 0.10. This
means that 5% of all pixel values will be set to 0 and 5% will
be set to the maxval
-type noise_type
Select type of noise by name. The following noise types are
available: gaussian, multiplicative_gaussian, impulse, lapla-
cian, poisson. Only enough letters to be unique are required
for the noise type option. The default noise type is gaussian.
• gaussian
• multiplicative_gaussian
• impulse
• laplacian
• poisson
REFERENCES
• "Adaptive Image Restoration in Signal-Dependent Noise" by R.
Kasturi Institute for Electronic Science, Texas Tech University,
1982
• "Digital Image Processing Algorithms" by Ioannis Pitas, Prentice
Hall, 1993 ISBN 0-13-145814-0
SEE ALSO
pgmnoise(1), pgmmedian(1), pnm(1), pam(1),
HISTORY
pamaddnoise was added to Netpbm in Version 10.29 (August 2005). It had
been distributed by Mike Burns via his own web site before that (and
continued to be so).
Burns' version, and the one in Netpbm 10.29, was called pnmaddnoise and
worked only on PNM images. In Netpbm 10.30, it was converted to handle
PAM images and renamed to pamaddnoise.
AUTHOR
Copyright (C) 1995 by Mike Burns <burns@cac.psu.edu>
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/pamaddnoise.html
netpbm documentation 12 December 2020 Pamaddnoise User Manual(1)
Generated by dwww version 1.15 on Sat Jun 29 02:39:10 CEST 2024.