1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkVnlFFTRealToComplexConjugateImageFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) 2002 Insight Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkVnlFFTRealToComplexConjugateImageFilter_txx
#define __itkVnlFFTRealToComplexConjugateImageFilter_txx
#include "itkVnlFFTRealToComplexConjugateImageFilter.h"
#include "itkFFTRealToComplexConjugateImageFilter.txx"
#include <iostream>
#include "itkIndent.h"
#include "itkMetaDataObject.h"
#include "itkExceptionObject.h"
#include "vnl/algo/vnl_fft_base.h"
#include "vnl/algo/vnl_fft_1d.h"
#include "vnl/algo/vnl_fft_2d.h"
#include "vnl_fft_3d.h"
#include "itkProgressReporter.h"
namespace itk
{
#define DEBUG_PRINT(x) x
template <class TPixel, unsigned int VDimension>
bool VnlFFTRealToComplexConjugateImageFilter<TPixel,VDimension>::
Legaldim(int n)
{
int ifac = 2;
for (int l = 1; l <= 3; l++)
{
// Original code
// k = 0;
// L10:
// if (n % ifac != 0) goto L20;
// ++k;
// N /= ifac;
// goto L10;
// L20:
// pqr[l-1] = k;
// ifac += l;
for(; n % ifac == 0;)
{
n /= ifac;
}
ifac += l;
}
return (n == 1); // return false if decomposition failed
}
template <class TPixel, unsigned int VDimension>
void
VnlFFTRealToComplexConjugateImageFilter<TPixel,VDimension>::
GenerateData()
{
unsigned int i;
// get pointers to the input and output
typename Superclass::TInputImageType::ConstPointer inputPtr = this->GetInput();
typename Superclass::TOutputImageType::Pointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
// we don't have a nice progress to report, but at least this simple line
// reports the begining and the end of the process
ProgressReporter progress(this, 0, 1);
const typename Superclass::TInputImageType::SizeType& inputSize
= inputPtr->GetLargestPossibleRegion().GetSize();
unsigned int num_dims = inputPtr->GetImageDimension();
if(num_dims != outputPtr->GetImageDimension())
{
return;
}
TPixel *in = const_cast<TPixel *>(inputPtr->GetBufferPointer());
outputPtr->SetBufferedRegion( outputPtr->GetRequestedRegion() );
outputPtr->Allocate();
std::complex<TPixel> *out = outputPtr->GetBufferPointer();
unsigned int vec_size = 1;
for(i = 0; i < num_dims; i++)
{
//#if 0
if( !this->Legaldim(inputSize[i]) )
{
ExceptionObject exception(__FILE__, __LINE__);
exception.SetDescription("Illegal Array DIM for FFT");
exception.SetLocation(ITK_LOCATION);
throw exception;
}
//#endif
vec_size *= inputSize[i];
}
vnl_vector< vcl_complex<TPixel> > signal(vec_size);
for(i = 0; i < vec_size; i++)
{
signal[i] = in[i];
}
switch(num_dims)
{
case 1:
{
vnl_fft_1d<TPixel> v1d(vec_size);
v1d.bwd_transform(signal);
}
break;
case 2:
{
vnl_fft_2d<TPixel> v2d(inputSize[1],inputSize[0]);
v2d.vnl_fft_2d<TPixel>::base::transform(signal.data_block(),-1);
}
break;
case 3:
{
vnl_fft_3d<TPixel> v3d(inputSize[2],inputSize[1],inputSize[0]);
v3d.vnl_fft_3d<TPixel>::base::transform(signal.data_block(),-1);
}
break;
default:
break;
}
for(i = 0; i < vec_size; i++)
{
out[i] = signal[i];
}
}
template <class TPixel, unsigned int VDimension>
bool
VnlFFTRealToComplexConjugateImageFilter<TPixel,VDimension>::
FullMatrix()
{
return true;
}
}
#endif
|
