I\'m looking for a C or C++ API that will give me real-time spectrum analysis of a waveform on Windows.
How can rotation angle be determined by phase correlation(using fft) of 2 images? The algorithm given in http://en.wikipedia.org/wiki开发者_JS百科/Phase_correlation returns linear shift, not angular.
Using GNU octave, I\'m computing a fft over a piece of signal, then eliminating some frequencies, and finally reconstructing the signal. This give me a nice approximation of the signal ; but it doesn\
I\'m writing a very simple in-place DFT.I am using the formula shown here: http://en.wikipedia.org/wiki/Discrete_Fourier_transform#Definition along with Euler\'s formula to avoid having to use a compl
I\'m trying to build a scalogram view for my app to see whether there is relevant information we can retrieve from a wavelet transform as opposed to using a 开发者_如何学Gospectograms to see what can
>> fft([1 4 66]) ans = 71.0000-34.0000 +53.6936i -34.0000 -53.6936i Can someone explain according t开发者_运维技巧he result above?EDIT Well that\'s embarassing.I left out a factor of 2.Updat
I want to make a fourier-transformation of an image. But how can I change the picture to an array? And after this I think I should use numpy.fft.rfft2 for the transformation.
Let\'s say I have an array of zeros: a = numpy.zeros(1000) I then introduce some repetitive \'events\':
As we know Fourier Transform is sensitive to noises(like salt and peppers), how can it st开发者_运维知识库ill be used for image recognization?
After some studyi开发者_JS百科ng, I created a small app that calculates DFTs (Discrete Fourier Transformations) from some input. It works well enough, but it is quite slow.
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