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📄 cfftwwrapper.htm

📁 对 FFTW 的 c++ 封装
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<div class=Section1>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'>Download Source Code here.<o:p></o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'>Download Precompiled binaries here.<o:p></o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'>This document describes how the FFTW version 3.0.1 based
Plugin for Image Apprentice works. For this, I have developed an easy to use
wrapper class around FFTW named </span><span class=SpellE><span
style='font-size:10.0pt;font-family:"Courier New";color:#993300'>CFFTWWrapper</span></span><span
style='font-size:10.0pt;font-family:Verdana'>. At the time of writing, the
latest version of Image Apprentice available is version 0.5.0.3.<o:p></o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'>This document assumes that you have gone through the
documentation of Image Apprentice and you are comfortable working with Image
Apprentice抯 Plugin Development Kit.<o:p></o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'>The purpose of the class </span><span class=SpellE><span
style='font-size:10.0pt;font-family:"Courier New";color:#993300'>CFFTWWrapper</span></span><span
style='font-size:10.0pt;font-family:Verdana'> is to build an easy to use
interface around the FFTW class. The class in no way utilizes the full
potential of the FFTW Library but completely suffices the need of this plugin,
namely computing FFT and Inverse FFT in 2D for a given Image Processing
Algorithm. The algorithm/filter can be implemented in-between the FFT and <span
class=SpellE>iFFT</span> steps using convolution and de-convolution.<o:p></o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'>There are 5 steps involved in applying Fast Fourier
Transform using FFTW:<o:p></o:p></span></p>

<p class=MsoNormal style='text-align:justify'><span style='font-size:10.0pt;
font-family:Verdana'><o:p>&nbsp;</o:p></span></p>

<ol style='margin-top:0in' start=1 type=1>
 <li class=MsoNormal style='text-align:justify;mso-list:l0 level1 lfo2;
     tab-stops:list .5in'><span style='font-size:10.0pt;font-family:Verdana'>Declare
     complex numbers to contain the image data allocate memory for them.<o:p></o:p></span></li>
 <li class=MsoNormal style='text-align:justify;mso-list:l0 level1 lfo2;
     tab-stops:list .5in'><span style='font-size:10.0pt;font-family:Verdana'>Create
     a plan to implement FFT in 憂

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