NAME
pamaddnoise - add noise to a Netpbm imageSYNOPSIS
pamaddnoise { [ -type gaussian]DESCRIPTION
This program is part of Netpbm(1). 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
In addition to the options common to all programs based on libnetpbm (most notably -quiet, seeCommon Options ), 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 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
- •
- 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 < [email protected]>DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at12 December 2020 | netpbm documentation |