<div dir="ltr"><span style="font-family:Arial,Helvetica,sans-serif;font-size:13px">Hi all,</span><div style="margin:0px;padding:0px;border:0px;vertical-align:baseline;font-family:Arial,Helvetica,sans-serif;font-size:13px">
I've already worked with FourierTransform and FFTConvolution classes, I've also studied their codes in order to adapt them to my program, anyway I still have some doubts about those classes and I hope you can help me! </div>
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First, dimensions of the output resulting from the FourierTransform and those of the fftKernel in the FFTConvolution class differ from those of the input images, why? Why, for example, if I transform a 256x256 image I get back a 281x560 spectrum?</div>
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Secondly, trying to find out an answer to the first doubt I have, I find out that the spectrum dimensions are calculated by using the package edu.mines.jtk.dsp and in particular the classes FftReal/FftComplex, both based on the Pfacc class. Comments to the Pfacc class said that this class implements the PFA algorithm for the FFT computation, so my second doubt is this: do the FourierTransform and FFTConvolution classes implement the PFA algorithm? </div>
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I really need to find it out in order to continue my work, so any help will be appreciated!</div><div style="margin:0px;padding:0px;border:0px;vertical-align:baseline;font-family:Arial,Helvetica,sans-serif;font-size:13px">
Thanks a lot,</div><div style="margin:0px;padding:0px;border:0px;vertical-align:baseline;font-family:Arial,Helvetica,sans-serif;font-size:13px"><br></div><div style="margin:0px;padding:0px;border:0px;vertical-align:baseline;font-family:Arial,Helvetica,sans-serif;font-size:13px">
Sara S.</div></div>