A question about Direct Fourier Reconstruction,or say the central silce theorem
5 次查看(过去 30 天)
显示 更早的评论
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.
0 个评论
回答(1 个)
Tiago Ramos
2016-9-6
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
0 个评论
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!