Content-type: text/html Manpage of addnoise

addnoise

Section: User Commands (1)
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NAME

addnoise - Adds noise to diffusion MRI measurements.

 

SYNOPSIS

addnoise -sigma <noise std> [-noisetype <type>]

 

DESCRIPTION

Reads diffusion MRI data and adds noise with standard deviation specified with the -sigma option. By default the noise is Rician with the specified value of sigma, but can be Gaussian by specifying -noisetype gaussian.

 

EXAMPLES

Add Rician noise to synthetic data:

datasynth -testfunc 1 -schemefile A.scheme -voxels 10 | addnoise -sigma 0.0625

The above is very similar to:

datasynth -testfunc 1 -schemefile A.scheme -voxels 10 -snr 16

only addnoise uses a different random number generator.

Add Gaussian noise instead:

datasynth -testfunc 1 -schemefile A.scheme -voxels 10 | addnoise -sigma 0.0625 -noisetype Gaussian

 

OPTIONS

-noisetype [rician|gaussian]
Specifies the noise model. The default is Rician, can also specify Gaussian.

-sigma <S>
Specifies the noise level. This is the standard deviation of the Gaussian distribution for Gaussian noise or that of the isotropic Gaussians on each component for Rician noise.

 

AUTHORS

Daniel Alexander <camino@cs.ucl.ac.uk>

 

SEE ALSO

datasynth(1)

 

BUGS


 

Index

NAME
SYNOPSIS
DESCRIPTION
EXAMPLES
OPTIONS
AUTHORS
SEE ALSO
BUGS

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Time: 02:06:54 GMT, December 10, 2011