A question about Direct Fourier Reconstruction,or say the central silce theorem
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Hello everyone ,I have a question that pazzled me about a long time,I wonder if someone will help me
The websites https://code.google.com/p/centralslice/downloads/list have the matlab code about central slice theorem.I want find the author to ask ,but don't find them .
question one :I don't understand why do a ifftshift to the projection before interplotion? question two :If the oversampling_ratio greater than one ,the reconstuction image will in the center,Why ? I think the frequency density is high ,the reconstruction image will in the top left corner.
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Answers (1)
Tiago Ramos
on 6 Sep 2016
in order for you to check ifftshift and fftshift issues I suggest: https://se.mathworks.com/matlabcentral/fileexchange/25473-why-use-fftshift-fft-fftshift-x----in-matlab-instead-of-fft-x--
Interpolation in the fourier domain corresponds to zero-padding in the direct domain. Oversampling an fft is the same as performing a sinc interpolation (The correct one) in the fourier domain
Best Tiago
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