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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 5.1

pamaddnoise(1)

pamaddnoise

Updated: 14 November 1995
Table Of Contents

NAME

pamaddnoise - add noise to a Netpbm image

SYNOPSIS

pamaddnoise [-type noise_type] [-seed int]
pamaddnoise -type gaussian [-sigma1 value] [-sigma2 value]
[-seed int] [netpbmfile]
pamaddnoise -type multiplicative_gaussian [-msigma value]
[-seed int] [netpbmfile]
pamaddnoise -type impulse [-tolerance ratio] [-seed int]
[netpbmfile]
pamaddnoise -type laplacian [-lsigma value] [-seed int]
[netpbmfile]
pamaddnoise -type poisson [-lambda value] [-seed int]
[netpbmfile]

DESCRIPTION

This program is part of Netpbm.

pamaddnoise adds the specified noise type to a Netpbm image. pamaddnoise
treats a PPM image as 3 independent planes, not as a plane of colors in a
color space.

OPTIONS

-lambda value
Used for poisson noise only. The default value is 0.05.
-lsigma value
Used for laplacian noise only. The default value is 10.0.
-msigma value
Used for mutliplicative gaussian noise only. The default value is
0.5.
-seed int
Used for all noise types. Set the initial random number generator
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, laplacian,
poisson. Only enough letters to be unique are required for the noise
type option. The default noise type is gaussian.
+ gaussian
+ mulitiplicative_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, pgmmedian, pnm, pam,

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>
_________________________________________________________________

Table Of Contents

* SYNOPSIS
* DESCRIPTION
* OPTIONS
* REFERENCES
* SEE ALSO
* HISTORY
* AUTHOR

pamaddnoise(1)