ITK  5.2.0
Insight Toolkit
SphinxExamples/src/Filtering/ImageGrid/ResampleAnImage/Code.cxx
/*=========================================================================
*
* Copyright NumFOCUS
*
* 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.
*
*=========================================================================*/
int
main(int argc, char * argv[])
{
if (argc != 4)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0];
std::cerr << " <InputFileName> <OutputFileName> <scale>";
std::cerr << std::endl;
return EXIT_FAILURE;
}
const char * inputFileName = argv[1];
const char * outputFileName = argv[2];
const float scale = std::stod(argv[3]);
constexpr unsigned int Dimension = 2;
using PixelType = unsigned char;
using ScalarType = double;
using ReaderType = itk::ImageFileReader<ImageType>;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(inputFileName);
reader->Update();
ImageType::Pointer inputImage = reader->GetOutput();
ImageType::RegionType region = inputImage->GetLargestPossibleRegion();
ImageType::SizeType size = region.GetSize();
ImageType::SpacingType spacing = inputImage->GetSpacing();
itk::Index<Dimension> centralPixel;
centralPixel[0] = size[0] / 2;
centralPixel[1] = size[1] / 2;
centralPoint[0] = centralPixel[0];
centralPoint[1] = centralPixel[1];
using ScaleTransformType = itk::ScaleTransform<ScalarType, Dimension>;
ScaleTransformType::Pointer scaleTransform = ScaleTransformType::New();
ScaleTransformType::ParametersType parameters = scaleTransform->GetParameters();
parameters[0] = scale;
parameters[1] = scale;
scaleTransform->SetParameters(parameters);
scaleTransform->SetCenter(centralPoint);
LinearInterpolatorType::Pointer interpolator = LinearInterpolatorType::New();
ResampleFilterType::Pointer resampleFilter = ResampleFilterType::New();
resampleFilter->SetInput(inputImage);
resampleFilter->SetTransform(scaleTransform);
resampleFilter->SetInterpolator(interpolator);
resampleFilter->SetSize(size);
resampleFilter->SetOutputSpacing(spacing);
using WriterType = itk::ImageFileWriter<ImageType>;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName(outputFileName);
writer->SetInput(resampleFilter->GetOutput());
try
{
writer->Update();
}
catch (itk::ExceptionObject & error)
{
std::cerr << "Error: " << error << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
itk::Index
Represent a n-dimensional index in a n-dimensional image.
Definition: itkIndex.h:66
itkLinearInterpolateImageFunction.h
itkImageFileReader.h
itk::GTest::TypedefsAndConstructors::Dimension2::SizeType
ImageBaseType::SizeType SizeType
Definition: itkGTestTypedefsAndConstructors.h:49
itk::ScaleTransform
Scale transformation of a vector space (e.g. space coordinates)
Definition: itkScaleTransform.h:41
itk::ImageFileReader
Data source that reads image data from a single file.
Definition: itkImageFileReader.h:75
itk::LinearInterpolateImageFunction
Linearly interpolate an image at specified positions.
Definition: itkLinearInterpolateImageFunction.h:50
itk::ImageFileWriter
Writes image data to a single file.
Definition: itkImageFileWriter.h:87
itk::GTest::TypedefsAndConstructors::Dimension2::RegionType
ImageBaseType::RegionType RegionType
Definition: itkGTestTypedefsAndConstructors.h:54
itkImageFileWriter.h
itk::ResampleImageFilter
Resample an image via a coordinate transform.
Definition: itkResampleImageFilter.h:90
itk::Point
A templated class holding a geometric point in n-Dimensional space.
Definition: itkPoint.h:53
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:86
itkResampleImageFilter.h
itk::GTest::TypedefsAndConstructors::Dimension2::Dimension
constexpr unsigned int Dimension
Definition: itkGTestTypedefsAndConstructors.h:44
itkScaleTransform.h
itk::Size::GetSize
const SizeValueType * GetSize() const
Definition: itkSize.h:169