[Insight-users] Inaccuracy in fftw calculation

[Cory Quammen]

Please post your code that is exhibiting the problem and state what
version of ITK you are using.

Thanks,
Cory

2011/10/5 Antonio Gómez Barquero <agb1 at alu.upct.es>:
> Inaccuracy in fftw calculation
>
>
>
> I am calculating the fft of an image which pixels are double with the FFTW
> library, for that purpose i am using the library fftw(http://www.fftw.org/)
> library in Visual Studio 2008 and using ITK.
>
>
>
> When I calculate the fft from a double pointer, with the method
> ‘fftw_plan_dft_c2r_2d’, it makes the calculation but introducing inaccuracy,
> it is around +- 0.5…
>
>
>
> I don’t really know what is wrong, maybe the spacing between pixels? The
> type of the data used? Did someone have this problem or something similar
> before?
>
>
>
> Many thanks in advanced.
>
>
>
> Antonio Gómez Barquero
>
>
>
> Ingeniero de Telecomunicaciones -Becario Investigador asociado a Actividades
> de I+D+I
>
> GTTS ( Grupo de Tratamiento y Teoría de la Señal)[ http://gtts.upct.es/]
>
> UPCT (Universidad Politécnica de Cartagena)[ http://www.upct.es/]
>
>
>
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-- 
Cory Quammen
Research Associate
Department of Computer Science
The University of North Carolina at Chapel Hill