OpenCV Q&A Forum - RSS feedhttp://answers.opencv.org/questions/OpenCV answersenCopyright <a href="http://www.opencv.org">OpenCV foundation</a>, 2012-2018.Wed, 31 May 2017 04:51:35 -0500dft functionhttp://answers.opencv.org/question/154673/dft-function/ I am using the dft function (tried with both real and complex input.... where imaginary part was set to zero).
The output of the dft is in a compressed format.
1) how do I convert this into the natural format?
2) is there a way to calculate the dft without this intermediate step?
3) If I use a real signal with a pure tone (e.g. sine wave), I get artifacts in the dft (instead of only that specific frequency, I get perturbations other frequencies also). Is this a known issue?
4) when I do the inverse dft (to get the original signal), the results typically have 2 orders of magnitude more noise than LabView (language similar to Matlab, with its own FFT algorithm), does OpenVC take shortcuts that include rounding of values?PhilippeWed, 31 May 2017 04:51:35 -0500http://answers.opencv.org/question/154673/