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
|
/*=========================================================================
*
* 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 "itkScalarImageToHistogramGenerator.h"
#include "itkMinimumMaximumImageFilter.h"
#include "itkImageFileReader.h"
int itkImageToHistogramFilterTest3( int argc, char * argv [] )
{
if( argc < 3 )
{
std::cerr << "Missing command line arguments" << std::endl;
std::cerr << "Usage : " << argv[0] << " inputScalarImageFileName outputHistogramFile.txt" << std::endl;
return EXIT_FAILURE;
}
const unsigned int Dimension = 2;
typedef unsigned char PixelComponentType;
typedef itk::Image< PixelComponentType, Dimension > ScalarImageType;
typedef itk::ImageFileReader< ScalarImageType > ReaderType;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName( argv[1] );
try
{
reader->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Problem encoutered while reading image file : " << argv[1] << std::endl;
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
itk::MinimumMaximumImageFilter<ScalarImageType>::Pointer minmaxFilter
= itk::MinimumMaximumImageFilter<ScalarImageType>::New();
minmaxFilter->SetInput(reader->GetOutput());
minmaxFilter->Update();
const ScalarImageType::PixelType imageMin = minmaxFilter->GetMinimum();
const ScalarImageType::PixelType imageMax = minmaxFilter->GetMaximum();
typedef itk::Statistics::ScalarImageToHistogramGenerator<ScalarImageType>
HistogramGeneratorType;
HistogramGeneratorType::Pointer histogramGenerator
= HistogramGeneratorType::New();
histogramGenerator->SetInput(reader->GetOutput());
const int NumberOfBins = static_cast<unsigned int>( imageMax - imageMin + 1 );
histogramGenerator->SetNumberOfBins( NumberOfBins );
histogramGenerator->SetMarginalScale(1.0);
// BUG revealed. Solution is located at:
// http://public.kitware.com/Bug/view.php?id=10025
histogramGenerator->SetHistogramMin( imageMin );
histogramGenerator->SetHistogramMax( imageMax );
histogramGenerator->Compute();
typedef HistogramGeneratorType::HistogramType HistogramType;
const HistogramType * histogram = histogramGenerator->GetOutput();
std::ofstream outputFile;
outputFile.open( argv[2] );
const unsigned int histogramSize = histogram->Size();
outputFile << "Histogram size " << histogramSize << std::endl;
unsigned int channel = 0; // red channel
outputFile << "Histogram of the scalar component" << std::endl;
for( unsigned int bin=0; bin < histogramSize; bin++ )
{
outputFile << "bin = " << bin << " frequency = ";
outputFile << histogram->GetFrequency( bin, channel ) << std::endl;
}
outputFile.close();
return EXIT_SUCCESS;
}
|
