ITK  5.2.0
Insight Toolkit
SphinxExamples/src/Filtering/ImageGrid/UpsampleOrDownsampleScalarImage/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 != 5)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0];
std::cerr << " <InputFileName> <OutputFileName> <size X> <size Y>";
std::cerr << std::endl;
return EXIT_FAILURE;
}
constexpr unsigned int Dimension = 2;
using PixelType = unsigned char;
const char * inputFileName = argv[1];
const char * outputFileName = argv[2];
ImageType::SizeType outputSize;
for (unsigned int dim = 0, k = 3; dim < Dimension; dim++)
{
outputSize[dim] = std::stoi(argv[k++]);
}
using ReaderType = itk::ImageFileReader<ImageType>;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(inputFileName);
reader->UpdateOutputInformation();
ImageType::Pointer inputImage = reader->GetOutput();
ImageType::SizeType inputSize = inputImage->GetLargestPossibleRegion().GetSize();
std::cout << "Input Size: " << inputSize << std::endl;
ImageType::SpacingType inputSpacing = inputImage->GetSpacing();
std::cout << "Input Spacing: " << inputSpacing << std::endl;
ImageType::SpacingType outputSpacing;
for (unsigned int dim = 0; dim < Dimension; dim++)
{
outputSpacing[dim] = static_cast<double>(inputSpacing[dim]) * static_cast<double>(inputSize[dim]) /
static_cast<double>(outputSize[dim]);
}
std::cout << "Output Size: " << outputSize << std::endl;
std::cout << "Output Spacing: " << outputSpacing << std::endl;
using TransformPrecisionType = double;
FilterType::Pointer filter = FilterType::New();
filter->SetInput(inputImage);
filter->SetSize(outputSize);
filter->SetOutputSpacing(outputSpacing);
filter->SetOutputOrigin(inputImage->GetOrigin());
filter->SetTransform(TransformType::New());
using WriterType = itk::ImageFileWriter<ImageType>;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName(outputFileName);
writer->SetInput(filter->GetOutput());
try
{
writer->Update();
}
catch (itk::ExceptionObject & error)
{
std::cerr << "Error: " << error << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
itk::IdentityTransform
Implementation of an Identity Transform.
Definition: itkIdentityTransform.h:50
itkImageFileReader.h
itk::GTest::TypedefsAndConstructors::Dimension2::SizeType
ImageBaseType::SizeType SizeType
Definition: itkGTestTypedefsAndConstructors.h:49
itk::ImageFileReader
Data source that reads image data from a single file.
Definition: itkImageFileReader.h:75
itk::ImageFileWriter
Writes image data to a single file.
Definition: itkImageFileWriter.h:87
itkIdentityTransform.h
itkImageFileWriter.h
itk::ResampleImageFilter
Resample an image via a coordinate transform.
Definition: itkResampleImageFilter.h:90
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
itk::Size::GetSize
const SizeValueType * GetSize() const
Definition: itkSize.h:169