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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 <iostream>
#include "itkAffineTransform.h"
#include "itkImageFileWriter.h"
#include "itkResampleImageFilter.h"
#include "itkTimeProbe.h"
int itkResampleImageTest5(int argc, char * argv [] )
{
// Resample an RGB image
const unsigned int NDimensions = 2;
typedef unsigned char PixelType;
typedef itk::RGBPixel<unsigned char> RGBPixelType;
typedef itk::Image<RGBPixelType, 2 > ImageType;
typedef ImageType::IndexType ImageIndexType;
typedef ImageType::Pointer ImagePointerType;
typedef ImageType::RegionType ImageRegionType;
typedef ImageType::SizeType ImageSizeType;
typedef double CoordRepType;
typedef itk::AffineTransform<CoordRepType,NDimensions>
AffineTransformType;
typedef itk::LinearInterpolateImageFunction<ImageType,CoordRepType>
InterpolatorType;
typedef itk::ImageFileWriter<ImageType>
WriterType;
if (argc < 2)
{
std::cout << "Usage: " << argv[0]
<< " scaling outputFilename" << std::endl;
return EXIT_FAILURE;
}
float scaling = atof( argv[1] );
// Create and configure an image
ImagePointerType image = ImageType::New();
ImageIndexType index = {{0, 0}};
ImageSizeType size = {{64,64}};
ImageRegionType region;
region.SetSize ( size );
region.SetIndex( index );
image->SetLargestPossibleRegion( region );
image->SetBufferedRegion( region );
image->Allocate();
unsigned int newDims = static_cast<unsigned int>( 64*scaling );
ImageSizeType osize = {{newDims, newDims}};
ImageType::SpacingType spacing;
spacing[0] = size[0] / static_cast<double>(osize[0]);
spacing[1] = size[1] / static_cast<double>(osize[1]);
// Fill image with a ramp
itk::ImageRegionIteratorWithIndex<ImageType> iter(image, region);
PixelType value;
for (iter.GoToBegin(); !iter.IsAtEnd(); ++iter)
{
index = iter.GetIndex();
value = index[0] + index[1];
iter.Set(value);
}
// Create an affine transformation
AffineTransformType::Pointer aff = AffineTransformType::New();
aff->Scale(0.9);
// Create a linear interpolation image function
InterpolatorType::Pointer interp = InterpolatorType::New();
interp->SetInputImage(image);
// Create and configure a resampling filter
itk::ResampleImageFilter< ImageType, ImageType >::Pointer resample;
resample = itk::ResampleImageFilter< ImageType, ImageType >::New();
resample->SetInput(image);
resample->SetSize(osize);
resample->SetTransform(aff);
resample->SetInterpolator(interp);
index.Fill( 0 );
resample->SetOutputStartIndex( index );
ImageType::PointType origin;
origin.Fill( 0.0 );
resample->SetOutputOrigin( origin );
resample->SetOutputSpacing( spacing );
// Run the resampling filter
itk::TimeProbe clock;
clock.Start();
resample->Update();
clock.Stop();
std::cout << "Resampling from " << size
<< " to " << osize
<< " took " << clock.GetMean() << " s" << std::endl;
WriterType::Pointer writer = WriterType::New();
writer->SetInput(resample->GetOutput());
writer->SetFileName(argv[2]);
writer->Update();
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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