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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkStreamingImageFilter.txx,v $
Language: C++
Date: $Date: 2004-12-21 22:47:31 $
Version: $Revision: 1.16 $
Copyright (c) Insight Software 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 _itkStreamingImageFilter_txx
#define _itkStreamingImageFilter_txx
#include "itkStreamingImageFilter.h"
#include "itkCommand.h"
#include "itkImageRegionIterator.h"
namespace itk
{
/**
*
*/
template <class TInputImage, class TOutputImage>
StreamingImageFilter<TInputImage,TOutputImage>
::StreamingImageFilter()
{
// default to 10 divisions
m_NumberOfStreamDivisions = 10;
// create default region splitter
m_RegionSplitter = ImageRegionSplitter<InputImageDimension>::New();
}
/**
*
*/
template <class TInputImage, class TOutputImage>
StreamingImageFilter<TInputImage,TOutputImage>
::~StreamingImageFilter()
{
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
StreamingImageFilter<TInputImage,TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Number of stream divisions: " << m_NumberOfStreamDivisions
<< std::endl;
if (m_RegionSplitter)
{
os << indent << "Region splitter:" << m_RegionSplitter << std::endl;
}
else
{
os << indent << "Region splitter: (none)" << std::endl;
}
}
/**
*
*/
template<class TInputImage, class TOutputImage>
void
StreamingImageFilter<TInputImage,TOutputImage>
::UpdateOutputData(DataObject *itkNotUsed(output))
{
unsigned int idx;
/**
* prevent chasing our tail
*/
if (this->m_Updating)
{
return;
}
/**
* Prepare all the outputs. This may deallocate previous bulk data.
*/
this->PrepareOutputs();
/**
* Make sure we have the necessary inputs
*/
unsigned int ninputs = this->GetNumberOfValidRequiredInputs();
if (ninputs < this->GetNumberOfRequiredInputs())
{
itkExceptionMacro(<< "At least " << static_cast<unsigned int>( this->GetNumberOfRequiredInputs() ) << " inputs are required but only " << ninputs << " are specified.");
return;
}
this->SetAbortGenerateData(0);
this->SetProgress(0.0);
this->m_Updating = true;
/**
* Tell all Observers that the filter is starting
*/
this->InvokeEvent( StartEvent() );
/**
* Allocate the output buffer.
*/
OutputImagePointer outputPtr = this->GetOutput(0);
OutputImageRegionType outputRegion = outputPtr->GetRequestedRegion();
outputPtr->SetBufferedRegion( outputRegion );
outputPtr->Allocate();
/**
* Grab the input
*/
InputImagePointer inputPtr =
const_cast< InputImageType * >( this->GetInput(0) );
/**
* Determine of number of pieces to divide the input. This will be the
* minimum of what the user specified via SetNumberOfStreamDivisions()
* and what the Splitter thinks is a reasonable value.
*/
unsigned int numDivisions, numDivisionsFromSplitter;
numDivisions = m_NumberOfStreamDivisions;
numDivisionsFromSplitter
= m_RegionSplitter
->GetNumberOfSplits(outputRegion, m_NumberOfStreamDivisions);
if (numDivisionsFromSplitter < numDivisions)
{
numDivisions = numDivisionsFromSplitter;
}
/**
* Loop over the number of pieces, execute the upstream pipeline on each
* piece, and copy the results into the output image.
*/
unsigned int piece;
InputImageRegionType streamRegion;
for (piece = 0;
piece < numDivisions && !this->GetAbortGenerateData();
piece++)
{
streamRegion = m_RegionSplitter->GetSplit(piece, numDivisions,
outputRegion);
inputPtr->SetRequestedRegion(streamRegion);
inputPtr->PropagateRequestedRegion();
inputPtr->UpdateOutputData();
// copy the result to the proper place in the output. the input
// requested region determined by the RegionSplitter (as opposed
// to what the pipeline might have enlarged it to) is used to
// construct the iterators for both the input and output
ImageRegionIterator<InputImageType> inIt(inputPtr, streamRegion);
ImageRegionIterator<OutputImageType> outIt(outputPtr, streamRegion);
for (inIt.GoToBegin(), outIt.GoToBegin(); !inIt.IsAtEnd(); ++inIt, ++outIt)
{
outIt.Set( inIt.Get() );
}
this->UpdateProgress((float) piece / numDivisions );
}
/**
* If we ended due to aborting, push the progress up to 1.0 (since
* it probably didn't end there)
*/
if ( !this->GetAbortGenerateData() )
{
this->UpdateProgress(1.0);
}
// Notify end event observers
this->InvokeEvent( EndEvent() );
/**
* Now we have to mark the data as up to data.
*/
for (idx = 0; idx < this->GetNumberOfOutputs(); ++idx)
{
if (this->GetOutput(idx))
{
this->GetOutput(idx)->DataHasBeenGenerated();
}
}
/**
* Release any inputs if marked for release
*/
this->ReleaseInputs();
// Mark that we are no longer updating the data in this filter
this->m_Updating = false;
}
} // end namespace itk
#endif
|
