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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 "itkImageFileReader.h"
#include "itkDCMTKImageIO.h"
#include "itkImageRegionConstIterator.h"
#include "itkMultiplyImageFilter.h"
#include "itkAddImageFilter.h"
#include "itkSubtractImageFilter.h"
#include "itkStatisticsImageFilter.h"
int itkDCMTKImageIOSlopeInterceptTest(int ac, char * av[])
{
if(ac < 3)
{
std::cerr << "Usage: " << av[0]
<< " <original image> <slope intercept image>"
<< std::endl;
return EXIT_FAILURE;
}
typedef short PixelType;
typedef itk::Image< PixelType, 3 > ImageType;
typedef itk::ImageFileReader< ImageType > ReaderType;
typedef itk::DCMTKImageIO ImageIOType;
const PixelType rescaleSlope(2);
const PixelType rescaleIntercept(-99);
ImageIOType::Pointer dcmImageIO = ImageIOType::New();
ImageType::Pointer images[2];
for(unsigned i = 0; i < 2; ++i)
{
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName( av[i+1] );
reader->SetImageIO( dcmImageIO );
try
{
reader->Update();
}
catch (itk::ExceptionObject & e)
{
std::cerr << "exception in file reader " << std::endl;
std::cerr << e << std::endl;
return EXIT_FAILURE;
}
images[i] = reader->GetOutput();
}
//
// the two inputs are a DICOM image without slope/intercept tags,
// and the same image with slpe/intercept tags. I read the first
// image and apply the slope/intercept, and then subtract the first
// from the second, then look for non-zero min/max/mean. They
// should be identical.
typedef itk::ImageRegionConstIterator<ImageType> ItType;
ItType it1(images[0],images[0]->GetLargestPossibleRegion());
ItType it2(images[1],images[1]->GetLargestPossibleRegion());
for(it1.GoToBegin(), it2.GoToBegin(); !it1.IsAtEnd() && !it2.IsAtEnd(); ++it1, ++it2)
{
PixelType pix1(it1.Get());
const PixelType pix2(it2.Get());
pix1 = (pix1 * rescaleSlope) + rescaleIntercept;
if(pix1 != pix2)
{
std::cerr << "computed pixel doesn't match pixel from slopeIntercept image: computed = "
<< pix1 << " slopeIntercept image = " << pix2 << std::endl;
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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