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/*=========================================================================
*
* 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 "itkImage.h"
#include "itkOtsuThresholdImageCalculator.h"
#include "itkSize.h"
#include "itkImageRegionIterator.h"
typedef itk::Size<3> SizeType;
typedef itk::Image<short, 3> ImageType;
typedef itk::OtsuThresholdImageCalculator<ImageType> CalculatorType;
namespace
{
/* Define the image size and physical coordinates */
SizeType size = {{20, 20, 20}};
double origin [3] = { 0.0, 0.0, 0.0};
double spacing[3] = { 1, 1 , 1};
}
int itkOtsuThresholdImageCalculatorTest(int, char* [] )
{
typedef itk::ImageRegionIterator<ImageType> Iterator;
int flag = 0; /* Did this test program work? */
std::cout << "Testing Minimum and Maximum Image Calulator:\n";
/* Allocate a simple test image */
ImageType::Pointer image = ImageType::New();
ImageType::RegionType region;
region.SetSize(size);
image->SetLargestPossibleRegion(region);
image->SetRequestedRegion(region);
image->SetBufferedRegion(region);
image->Allocate();
/* Set origin and spacing of physical coordinates */
image->SetOrigin(origin);
image->SetSpacing(spacing);
unsigned long numPixels = region.GetNumberOfPixels();
Iterator iter ( image, image->GetBufferedRegion() );
short value1 = 10;
short value2 = 50;
short range = 5;
short r2 = range * 2 + 1;
/* Fill one half of with values of Value1 +- 2 */
unsigned long i;
for ( i = 0; i < numPixels / 2; i++ )
{
iter.Set( ( i % r2 ) + value1 - range );
++iter;
}
/* Fill the other half with values of Value2 +- 2 */
for ( i = numPixels / 2; i < numPixels; i++ )
{
iter.Set( ( i % r2 ) + value2 - range );
++iter;
}
/* Create and initialize the calculator */
CalculatorType::Pointer calculator = CalculatorType::New();
calculator->SetImage(image);
calculator->SetNumberOfHistogramBins( 64);
calculator->Compute();
std::cout << "calculator: " << calculator;
std::cout << "NumberOfHistogramBins: " << calculator->GetNumberOfHistogramBins();
std::cout << std::endl;
/* Return minimum of intensity */
short thresholdResult = calculator->GetThreshold();
std::cout << "The threshold intensity value is : " << thresholdResult << std::endl;
if ( thresholdResult < value1 || thresholdResult > value2 )
{
std::cout << "Threshold Value is wrong : " << thresholdResult << std::endl;
std::cout << "Should be between " << value1 << " and " << value2 << std::endl;
flag = 1;
}
/* Return results of test */
if (flag != 0)
{
std::cout << "*** Some tests failed" << std::endl;
return EXIT_FAILURE;
}
else
{
std::cout << "All tests successfully passed" << std::endl;
return EXIT_SUCCESS;
}
}
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