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
|
/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkSimpleFilterWatcher.h"
#include "itkVectorGradientMagnitudeImageFilter.h"
#include "itkComposeImageFilter.h"
#include "itkRGBToVectorImageAdaptor.h"
// Pasting enables the writing of a sub-region to a file. This example
// updates a small portion of the 2D coronal slice. The file
// streamed_paste_vm.mha can either not exist or can be copied from
// the output of the previous example.
//
// Below we begin by creating a reader for the file just written that
// is capable of streaming.
int main(int argc, char *argv[])
{
if ( argc < 3 )
{
std::cerr << "Missing Parameters " << std::endl;
std::cerr << "Usage: " << argv[0];
std::cerr << " inputImageFile outputImageFile" << std::endl;
return EXIT_FAILURE;
}
std::string inputImageFile = argv[1];
std::string outputImageFile = argv[2];
typedef itk::RGBPixel< unsigned char > RGBPixelType;
typedef itk::Image< RGBPixelType, 2 > RGB2DImageType;
// we begin by creating a reader for the file just written that is
// capable of streaming
typedef itk::ImageFileReader< RGB2DImageType > ImageReaderType;
ImageReaderType::Pointer reader = ImageReaderType::New();
reader->SetFileName( inputImageFile );
// The pipeline is continued through a gradient magnitude filter,
// which works on vector images to produce a scalar output. Then a
// color image is recreated by compositing the output as red, green,
// and blue channels.
typedef itk::VectorGradientMagnitudeImageFilter< RGB2DImageType > GradientMagnitudeImageFilter;
GradientMagnitudeImageFilter::Pointer grad = GradientMagnitudeImageFilter::New();
grad->SetInput( reader->GetOutput() );
grad->SetUseImageSpacingOn();
typedef GradientMagnitudeImageFilter::OutputImageType GradientMagnitudeOutputImageType;
typedef itk::ComposeImageFilter< GradientMagnitudeOutputImageType, RGB2DImageType > ComposeRGBFilterType;
ComposeRGBFilterType::Pointer composeRGB = ComposeRGBFilterType::New();
composeRGB->SetInput1( grad->GetOutput() );
composeRGB->SetInput2( grad->GetOutput() );
composeRGB->SetInput3( grad->GetOutput() );
// Next we begin to specify the paste region, by creating an
// ImageIORegion that is half the size and centered on the entire
// image. The ImageIORegion class is similar to the ImageRegion class
// except that it is not templated over the image dimension, because
// of the runtime nature of IO.
composeRGB->UpdateOutputInformation();
RGB2DImageType::RegionType largest = composeRGB->GetOutput()->GetLargestPossibleRegion();
itk::ImageIORegion halfIO(2);
halfIO.SetIndex( 0, largest.GetIndex(0)
+ (unsigned long) (0.25 * largest.GetSize(0)) );
halfIO.SetIndex( 1, largest.GetIndex(1)
+ (unsigned long) (0.25 * largest.GetSize(1)) );
halfIO.SetSize( 0, (unsigned long) (0.5 * largest.GetSize(0)) );
halfIO.SetSize( 1, (unsigned long) (0.5 * largest.GetSize(1)) );
// After using an adaptor to convert the color image into a vector
// image, so that the pixel type will match the type in the file, we
// create a writer. Here both streaming and pasting are used. To
// enable pasting, a call to SetIORegion is made with a valid
// region. Finally, the pipeline is updated, causing the streaming of
// regions
typedef itk::RGBToVectorImageAdaptor< RGB2DImageType > ToVectorImageAdaptorType;
ToVectorImageAdaptorType::Pointer adaptor = ToVectorImageAdaptorType::New();
adaptor->SetImage( composeRGB->GetOutput() );
typedef itk::ImageFileWriter< ToVectorImageAdaptorType > ImageWriterType;
ImageWriterType::Pointer writer = ImageWriterType::New();
writer->SetFileName( outputImageFile );
writer->SetNumberOfStreamDivisions( 10 );
writer->SetIORegion( halfIO );
writer->SetInput( adaptor );
itk::SimpleFilterWatcher watcher1(writer, "stream pasting writing");
itk::SimpleFilterWatcher watcher(grad, "stream gradient magnitude");
try
{
writer->Update();
}
catch( itk::ExceptionObject & err )
{
std::cerr << "ExceptionObject caught !" << std::endl;
std::cerr << err << std::endl;
return EXIT_FAILURE;
}
// This pasting example only writes the small halfIO region to the
// file, the remainder is not touched. The manner in which the
// pipeline executed is very similar to the previous streaming
// example. The main difference is that the writer only breaks up the
// IORegion for streaming, not the entire image. The other difference
// is that the reader fully supports streaming and only reads the
// required region from the file.
return EXIT_SUCCESS;
}
|
