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pnmaddnoise(1)					pnmaddnoise(1)

NAME
       pnmaddnoise - add noise to a portable anymap

SYNOPSIS
       pnmaddnoise [-type noise_type] [-seed int]
       pnmaddnoise -type gaussian [-sigma1 value] [-sigma2 value]
		   [-seed int] [pnmfile]
       pnmaddnoise -type multiplicative_gaussian [-msigma value]
		   [-seed int] [pnmfile]
       pnmaddnoise -type impulse [-tolerence ratio] [-seed int]
		   [pnmfile]
       pnmaddnoise -type laplacian [-lsigma value] [-seed int]
		   [pnmfile]
       pnmaddnoise -type poisson [-lambda value] [-seed int]
		   [pnmfile]

DESCRIPTION
       Adds the specified noise type to a portable  anymap.   PPM
       files are treated one color plane at a time, not as a col-
       orspace. See source code for meaning of options	particu-
       lar to each noise type.

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.

       -tolerence 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 MAXVAL.

       -type noise_type
	      Select  type of noise by name.  The following noise

			 14 November 1995			1

pnmaddnoise(1)					pnmaddnoise(1)

	      types are available: gaussian, multiplicative_gaus-
	      sian,  impulse,  laplacian,  poisson.   Only enough
	      letters to be unique are	required  for  the  noise
	      type option.  The default noise type is gaussian.

BUGS
       PPM  files are treated one color plane at a time, not as a
       color space.

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), pnm(5), pnmmedian(1), pnmsmooth(1)

AUTHOR
       Copyright (C) 1995 by Mike Burns <burns@cac.psu.edu>

			 14 November 1995			2

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