[vtkusers] adding noise to vtkImageData

[Oleksandr Dzyubak]

Hi Prathamesh,

You might find useful the contribution "Noise Simulation"
from Gaetan Lehmann on 03-18-2010.

http://www.midasjournal.org/browse/publication/721

As stated by the author:
"Several kind of noise can be found in real images, mostly depending on 
the modality
of acquisition. It is often useful to be able to simulate that noise, 
for example
to test the behavior of an algorithm in the presence of a known amount 
of noise.

This contribution provides the filters to generate four kind of noise -- 
additive
gaussian, shot, speckle and salt and pepper -- as well as a PSNR 
calculator."

I am using that contribution for my development and it works well for me 
so far.

Alex


Prathamesh Kulkarni wrote:
>
> Hello all,
>
> I need to add different kinds of noise to a vtkImage. I have looked at 
> vtkImageNoiseSource and vtkMath::Random().
>
> Of these,
>
> vtkImageNoiseSource only produces a uniform noise output - is there a 
> way (already existing in vtk) to have a different underlying noise 
> distribution?
>
> vtkMath::Random produces a random number - what is the internal 
> distribution used here?
>
>
> Apart from these, are there any other better ways to adding noise to 
> vtkImages?
>
>
> Thanks in advance,
>
>
> Prathamesh
>
>
>
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