Top "Dft" questions

only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices

I am implementing fft as part of my homework. My problem lies in the implemention of shuffling data elements using …

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FFT on image with Python

I have a problem with FFT implementation in Python. I have completely strange results. Ok so, I want to open …

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Fast Fourier Transform

I need to multiply two polynomials each having small integral coefficients. I need a fast FFT routine in C/C++ …

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FFT real/imaginary/abs parts interpretation

I'm currently learning about discret Fourier transform and I'm playing with numpy to understand it better. I tried to plot …

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DSP - Filtering in the frequency domain via FFT

I've been playing around a little with the Exocortex implementation of the FFT, but I'm having some problems. Whenever I …

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Inverse fourier transformation in OpenCV

I am new in OpenCV and image processing algorithms. I need to do inverse discrete fourier transformation in OpenCV in …

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Power spectrum of an image

I have begun (a small project) to calculate the power spectrum of an image in the frequency domain. So, what …

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amplitude of numpy's fft results is to be multiplied by sampling period?

I try to validate my understanding of Numpy's FFT with an example: the Fourier transform of exp(-pi*t^2) should …

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How can I get DFT/FFT output frequencies in Hertz?

I want to develop musical notes detector as my degree project and I want to do it from scratch. I …

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unit of fft(DFT) x axis

Possible Duplicate: How to get Frequency from FFT result I am somehow confused with the x axis of fft(DFT) …

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