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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 "itkFFTConvolutionImageFilter.h"
#include "itkFlipImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkTestingMacros.h"
int itkFFTConvolutionImageFilterDeltaFunctionTest(int argc, char * argv[])
{
if ( argc < 3 )
{
std::cout << "Usage: " << argv[0] << " kernelImage outputImage sizeGreatestPrimeFactor" << std::endl;
return EXIT_FAILURE;
}
const unsigned int ImageDimension = 2;
typedef unsigned char PixelType;
typedef itk::Image< PixelType, ImageDimension > ImageType;
typedef itk::ImageFileReader< ImageType > ReaderType;
// Read kernel image
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName( argv[1] );
TRY_EXPECT_NO_EXCEPTION( reader->Update() );
// Set up delta function image
ImageType::RegionType region = reader->GetOutput()->GetLargestPossibleRegion();
ImageType::Pointer deltaFunctionImage = ImageType::New();
deltaFunctionImage->SetRegions( region );
deltaFunctionImage->Allocate(true); // initialize buffer to zero
// Set the middle pixel (rounded up) to 1
ImageType::IndexType middleIndex;
for ( unsigned int i = 0; i < ImageDimension; ++i )
{
ImageType::SizeValueType sizeInDimension = region.GetSize()[i];
middleIndex[i] =
itk::Math::Floor< ImageType::IndexValueType >( 0.5 * sizeInDimension );
}
deltaFunctionImage->SetPixel( middleIndex, 1 );
typedef itk::FFTConvolutionImageFilter<ImageType> ConvolutionFilterType;
ConvolutionFilterType::Pointer convolver = ConvolutionFilterType::New();
EXERCISE_BASIC_OBJECT_METHODS( convolver, FFTConvolutionImageFilter, ConvolutionImageFilterBase );
convolver->SetInput( deltaFunctionImage );
convolver->SetKernelImage( reader->GetOutput() );
ConvolutionFilterType::SizeValueType sizeGreatestPrimeFactor = atoi( argv[3] );
if( !itk::Math::IsPrime( sizeGreatestPrimeFactor ) )
{
std::cerr << "A prime number is expected for the greatest prime factor size!" << std::endl;
return EXIT_FAILURE;
}
convolver->SetSizeGreatestPrimeFactor( sizeGreatestPrimeFactor );
TEST_SET_GET_VALUE( sizeGreatestPrimeFactor, convolver->GetSizeGreatestPrimeFactor() );
TRY_EXPECT_NO_EXCEPTION( convolver->Update() );
typedef itk::ImageFileWriter<ImageType> WriterType;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName( argv[2] );
writer->SetInput( convolver->GetOutput() );
TRY_EXPECT_NO_EXCEPTION( writer->Update() );
return EXIT_SUCCESS;
}
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