ImageGear .NET v25.2 - Updated
Developer Guide / How to Work with... / Image Processing and Cleanup / Process Images in the Frequency Domain / Fast Fourier Transform
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    Fast Fourier Transform
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    Fast Fourier Transform (FFT) performs a multidimensional FFT on the input object specified by Input File. FFT is based on the FFTW 3 library (see www.fftw.org).

    Before using these methods, like other frequency processing methods, ImGearFrequencyProcessing.InitializeFFTW Method() must be called first to enable support for FFTW.