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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
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- EXAMPLES
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- OPTIONS
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- AUTHORS
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- SEE ALSO
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- BUGS
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