fftw

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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 (http[详细]

2023-04-11 03:19 分类：问答
Fast way to sum Fourier series?

I have generated the coefficients using FFTW, now I want to reconstruct the original data, but using only the first numCoefs coefficients rather than all of them. At the moment I\'m using the below co[详细]

2023-04-09 09:38 分类：问答
How does one install the FFTW package under Fedora and get Octave to recognize it as loaded?

All the references to FFTW in Octave make it sound like it is a package only for Octave (not quite true, but close), and give instructions for installing a tar.gz file by typing on the Octave command[详细]

2023-04-08 22:49 分类：问答
Segmentation fault using FFTW

I have a pretty involving program that uses an in house FFT algorithm. I recently decided to try using FFTW for a performance increase. Just as a simple test to ensure that FFTW would link and run, I[详细]

2023-04-07 21:05 分类：问答
CUFFT output not aligned the same as FFTW output

I am doing a 1D FFT. I have the same input data as would go in FFTW, however, the return from CUFFT does not seem to be \"aligned\" the same was FFTW is. That is, In my FFTW code, I could calculate th[详细]

2023-04-07 10:46 分类：问答
FFTW: Trouble with real to complex and complex to real 2D tranfsorms

As the title states I\'m using FFTW (version 3.2.2) with Fortran 90/95 to perform a 2D FFT of real data (actually a field of random numbers).I think the forward step is working (at least I am getting[详细]

2023-04-06 15:16 分类：问答
Linking FFTW into an Android NDK application

I am currently writing a genre classification application as my final year project in Computer Engineering.I initially wrote the feature extraction code (im开发者_JAVA技巧plementing FFTW) in C and now[详细]

2023-04-01 09:49 分类：问答
Pixelvalues of an image in a 2D double* pointer for calculating FFT_2D

I want to calculate the FFT of an image, I read the image, and the ITK SmartPointer is called “imagen”.[详细]

2023-03-22 08:57 分类：问答
Violation access in time compilation (0xC0000005)

The process I want to do is to make the FFT to an image (stored in “imagen”) , and then, multiply it with a filter ‘H’, after that, the inverse FFT will be done also.[详细]

2023-03-21 14:21 分类：问答
Reinterpret_cast use in C++

Just a simple question,having this: fftw_complex *H_cast; H_cast = (fftw_complex*) fftw_malloc(sizeof(fftw_comp开发者_运维知识库lex)*M*N);[详细]

2023-03-21 00:19 分类：问答