[Insight-users] Re: FFTW librairies not built with ITK

[Julien Jomier]

Hi Isabelle,

You should link your program with the FFTW libraries.
If you are using ITK with your program you can do something like that in 
your CMakeLists.txt

SET(CMAKE_MODULE_PATH ${ITK_SOURCE_DIR}/CMake)
OPTION(USE_FFTWD "Use double precision FFTW if found" ON)
OPTION(USE_FFTWF "Use single precision FFTW if found" OFF)
FIND_PACKAGE( FFTW )

Or just copy the FindFFTW.cmake (in Insight/CMake) in your current 
directory and use the default INCLUDE(FindFFTW.cmake).

Then you need to tell CMake to link these libraries

IF(USE_FFTWF)
   LINK_LIBRARIES(${FFTWF_LIB})
ENDIF(USE_FFTWF)

IF(USE_FFTWD)
   LINK_LIBRARIES(${FFTWD_LIB})
ENDIF(USE_FFTWD)

Note that by using the FindFFTW.cmake you don't need the '#define 
USE_FFTWD 1' anymore since CMake is adding the definition for you.

Hope that helps,

Julien

Renaud Isabelle wrote:
> Hi,
>  
> - You are right Julien:
> #define USE_FFTWD 1
> #include "itkFFTWRealToComplexConjugateImageFilter.h" removes the error 
> that FFTWRealToConjugateComplexImageFilter is not a member of ITK.
>  
> However, it is still not simple for me. Now, I have this kind of linking 
> errors:
>  
> */"error LNK2019: symbole externe non résolu _fftw_destroy_plan 
> référencé for/*
> */fftw_destroy_plan/*
> */fftwf_destroy_plan/*
> */fftw_execute/*
> */fftw_plan_dft_r2c/*
> */fftw_plan_dft_r2c_1d/*
> */fftw_plan_dft_r2c_2d/*
> */fftw_plan_dft_r2c_3d"/*
> *//* 
> I believe that, maybe, *ITK fftw librairies have not been built*. Are 
> there some ITK fftw librairies to build? Or do I have just to mention 
> where are fftw.h and fftwd.lib as configuring ITK with CMake? As looking 
> at FindFFTW.cmake, I find words about *"libfftw.a-->double, 
> libfftwf.a-->float":* are there the names of ITK librairies for FFTW? If 
> so, I made a search for these files in my ITK bin directory, and I 
> didn't find them.....
>  
> Isabelle
> // 
> / /
>  
>  
> 
> */Julien Jomier <jjomier at cs.unc.edu>/* a écrit :
> 
>     Isabelle,
> 
>     you need to add:
> 
>     #define USE_FFTWD 1
> 
>     before including itkFFTWRealToComplexConjugateImageFilter.h in your code
> 
>     Hope that helps,
> 
>     Julien
> 
>     Renaud Isabelle wrote:
>      > Hi,
>      >
>      > It's still concerning how to use FFTW witk ITK.
>      >
>      > Before, I was using Microsoft Visual C++ 6.0 whose compilator was
>     buggy
>      > to build fftw librairies. Since today, I have Microsoft Visual
>     C++ 7.1.
>      > So I downloaded from the official website and build without
>     problem the
>      > FFTW library (I got my *fftwd.lib* built with MSVC7.1).
>      >
>      > Then I have to rebuild ITK and VTK with CMake and MSVC7.1.
>      >
>      > As building ITK 2.2 witk CMake, I set *USE_FFTWD to ON*. I have
>     no error
>      > when compiling. So now, I supposed that I could use
>      > itkFFTWRealToComplexImageFilter in my own project. However,
>     introducing
>      > the instruction "typedef
>      > itk::FFTWRealToComplexConjugateImageFilter FFTFilter; " in my
>      > code still generates an error:
>      > *"FFTWRealToComplexComplexConjugateImageFilter is not a member of
>     ITK"*.
>      > *What do I have to do to make it a member of ITK???? Am I missing
>     a step? *
>      >
>      >
>      > - BTW, I would like to say that I tried another ways to compute
>     my FFT
>      > (with Numerical Recipes and Vnl) but it didn't work (zero padding
>     caused
>      > wrap problems and Vnl ifft computed module ). That is why I have to
>      > insist. Actually, I make my boss buy Microsoft Visual C++ 7.1
>     software
>      > in order to use itkFFTW, and it is still not working. I really
>     need help.
>      >
>      > Isabelle
>      >
>      >
>      >
>      >
>      >
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