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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Pamaddnoise User Manual</title></head>
<body>
<h1>pamaddnoise</h1>
Updated: 12 December 2020
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
pamaddnoise - add noise to a Netpbm image
<h2 id="synopsis">SYNOPSIS</h2>
<b>pamaddnoise</b>
<br>
{
<br>
[<b>-type</b> <b>gaussian</b>]
[<b>-sigma1</b> <i>value</i>]
[<b>-sigma2</b> <i>value</i>]
<br>
|
<br>
<b>-type </b> <b>multiplicative_gaussian</b>
[<b>-mgsigma</b> <i>value</i>]
<br>
|
<br>
<b>-type</b> <b>impulse</b>
[<b>-tolerance</b> <i>ratio</i>]
<br>
|
<br>
<b>-type </b> <b>laplacian</b>
[<b>-lsigma</b> <i>value</i>]
<br>
|
<br>
<b>-type </b> <b>poisson</b>
[<b>-lambda</b> <i>value</i>]
<br>
}
<br>
[<b>-seed</b> <i>int</i>]
[<i>netpbmfile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pamaddnoise</b> adds the specified noise type to a Netpbm image.
<b>pamaddnoise</b> treats a PPM image as 3 independent planes, not as
a plane of colors in a color space.
<h2 id="options">OPTIONS</h2>
<p>In addition to the options common to all programs based on libnetpbm
(most notably <b>-quiet</b>, see <a href="index.html#commonoptions">
Common Options</a>), <b>pamaddnoise</b> recognizes the following
command line options:
<dl compact>
<dt><b>-lambda</b> <i>value</i>
<dd>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.
<p>This is meaningful only with <b>-type=poisson</b>.
<p>The default value is 12.
<dt><b>-lsigma</b> <i>value</i>
<dd>Used for laplacian noise only. The default value is 10.0.
<dt><b>-mgsigma</b> <i>value</i>
<dd>Used for multiplicative gaussian noise only. The default value is
0.5.
<dt><b>-seed</b> <i>int</i>
<dd>Used for all noise types. Set the initial random number generator
seed value.
<dt><b>-sigma1</b> <i>value</i>
<dd>Used for gaussian noise only. The default value is 4.0.
<dt><b>-sigma2</b> <i>value</i>
<dd>Used for gaussian noise only. The default value is 20.0.
<dt><b>-tolerance</b> <i>ratio</i>
<dd>
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
<dt><b>-type</b> <i>noise_type</i>
<dd>
Select type of noise by name. The following noise types are
available: gaussian, multiplicative_gaussian, impulse, laplacian,
poisson. Only enough letters to be unique are required for the noise
type option. The default noise type is <b>gaussian</b>.
<ul>
<li><b>gaussian</b>
<li><b>multiplicative_gaussian</b>
<li><b>impulse</b>
<li><b>laplacian</b>
<li><b>poisson</b>
</ul>
</dl>
<h2 id="references">REFERENCES</h2>
<ul>
<li>"Adaptive Image Restoration in Signal-Dependent Noise"
by R. Kasturi Institute for Electronic Science, Texas Tech University,
1982
<li>"Digital Image Processing Algorithms" by Ioannis Pitas,
Prentice Hall, 1993 ISBN 0-13-145814-0
</ul>
<h2 id="seealso">SEE ALSO</h2>
<a href="pgmnoise.html">pgmnoise</a>,
<a href="pgmmedian.html">pgmmedian</a>,
<a href="pnm.html">pnm</a>,
<a href="pam.html">pam</a>,
<h2 id="history">HISTORY</h2>
<p><b>pamaddnoise</b> 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).
<p>Burns' version, and the one in Netpbm 10.29, was called <b>pnmaddnoise</b>
and worked only on PNM images. In Netpbm 10.30, it was converted to handle
PAM images and renamed to <b>pamaddnoise</b>.
<h2 id="author">AUTHOR</h2>
Copyright (C) 1995 by Mike Burns <<a
href="mailto:burns@cac.psu.edu">burns@cac.psu.edu</a>>
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#references">REFERENCES</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#history">HISTORY</a>
<li><a href="#author">AUTHOR</a>
</ul>
</body>
</html>
|
