[Insight-users] logarithmic intensity transformation

[Jakub Bican]

Hi Isabelle,

logarithmic scaling can be done by these filters:

   LogImageFilter ( 
http://www.itk.org/Doxygen/html/classitk_1_1LogImageFilter.html )
   Log10ImageFilter ( 
http://www.itk.org/Doxygen/html/classitk_1_1Log10ImageFilter.html )

and/or adaptors:

   LogImageAdaptor ( 
http://www.itk.org/Doxygen/html/classitk_1_1LogImageAdaptor.html )
   Log10ImageAdaptor ( 
http://www.itk.org/Doxygen/html/classitk_1_1Log10ImageAdaptor.html )

Hope this will help you.

Regards,
              Jakub


Renaud Isabelle napsal(a):

> Hi Luis,
>  
> In one of your numerous posted replies, you already mentioned the use 
> of *logarithmic scaling* to improve visualisation of images.
>  
> "It is not rare to use a logarithmic intensity transformation in order 
> to display the FFT output and still be able to "see" something."
> http://public.kitware.com/pipermail/insight-users/2004-November/011201.html
>  
> This is actually what I need to do to improve the quality of my 
> ultrasonographic image.
>  
> --> Could you tell me a way to perform this logarithmic scaling? Is 
> there already a function for that, or maybe could I compute my own one 
> if you tell me how to get access of the pixel data of my image 
> displayed with ITK and VTK.
>  
> Thanks for answer,
>  
> Isabelle
>
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