ITK  5.2.0
Insight Toolkit
Examples/RegistrationITKv4/ChangeInformationImageFilter.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.
*
*=========================================================================*/
// Software Guide : BeginLatex
//
// The \doxygen{ChangeInformationImageFilter} is commonly used to modify
// image metadata such as origin, spacing, and orientation. This filter
// leaves intact the pixel data of the image. This filter should be used
// with extreme caution, since it can easily change information that is
// critical for the safety of many medical image analysis tasks, such as
// measurement the volume of a tumor, or providing guidance for surgery.
//
// The following example illustrates the use of the ChangeInformation image
// filter in the context of generating synthetic inputs for image
// registration tests.
//
// \index{itk::ChangeInformationImageFilter}
//
// Software Guide : EndLatex
#include "itkImage.h"
#include "itkVersor.h"
// Software Guide : BeginLatex
//
// The header file corresponding to this filter should be included first.
//
// \index{itk::ChangeInformationImageFilter!header}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
// Software Guide : EndCodeSnippet
int
main(int argc, char * argv[])
{
if (argc < 3)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFile outputImageFile" << std::endl;
std::cerr << " [scalingFactor] [translationX translationY translationZ]"
<< std::endl;
std::cerr << " [rotationZinDegrees]" << std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginLatex
//
// Then the pixel and image types of the input and output must be defined.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
using PixelType = unsigned char;
constexpr unsigned int Dimension = 3;
// Software Guide : EndCodeSnippet
using ReaderType = itk::ImageFileReader<ImageType>;
using WriterType = itk::ImageFileWriter<ImageType>;
ReaderType::Pointer reader = ReaderType::New();
WriterType::Pointer writer = WriterType::New();
reader->SetFileName(argv[1]);
writer->SetFileName(argv[2]);
// Software Guide : BeginLatex
//
// Using the image types, it is now possible to define the filter type
// and create the filter object.
//
// \index{itk::ChangeInformationImageFilter!instantiation}
// \index{itk::ChangeInformationImageFilter!New()}
// \index{itk::ChangeInformationImageFilter!Pointer}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
FilterType::Pointer filter = FilterType::New();
// Software Guide : EndCodeSnippet
//
// The reader must be triggered in order to make possible to gather
// information from the input image.
//
try
{
reader->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
ImageType::ConstPointer inputImage = reader->GetOutput();
ImageType::PointType origin = inputImage->GetOrigin();
ImageType::SpacingType spacing = inputImage->GetSpacing();
ImageType::DirectionType direction = inputImage->GetDirection();
if (argc > 3)
{
double scale = std::stod(argv[3]);
for (unsigned int i = 0; i < Dimension; i++)
{
spacing[i] *= scale;
}
filter->SetOutputSpacing(spacing);
filter->ChangeSpacingOn();
}
if (argc > 6)
{
translation[0] = std::stod(argv[4]);
translation[1] = std::stod(argv[5]);
translation[2] = std::stod(argv[6]);
origin += translation;
filter->SetOutputOrigin(origin);
filter->ChangeOriginOn();
}
if (argc > 7)
{
double additionalAngle = std::stod(argv[7]);
double angleInRadians = additionalAngle * itk::Math::pi / 180.0;
rotation.SetRotationAroundZ(angleInRadians);
ImageType::DirectionType newDirection = direction * rotation.GetMatrix();
filter->SetOutputDirection(newDirection);
filter->ChangeDirectionOn();
}
// Software Guide : BeginLatex
//
// The input to the filter can be taken from any other filter, for example
// a reader. The output can be passed down the pipeline to other filters,
// for example, a writer. An update call on any downstream filter will
// trigger the execution of the median filter.
//
// \index{itk::ChangeInformationImageFilter!SetInput()}
// \index{itk::ChangeInformationImageFilter!GetOutput()}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
filter->SetInput(reader->GetOutput());
writer->SetInput(filter->GetOutput());
// Software Guide : EndCodeSnippet
try
{
writer->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
itk::GTest::TypedefsAndConstructors::Dimension2::DirectionType
ImageBaseType::DirectionType DirectionType
Definition: itkGTestTypedefsAndConstructors.h:52
itk::GTest::TypedefsAndConstructors::Dimension2::VectorType
ImageBaseType::SpacingType VectorType
Definition: itkGTestTypedefsAndConstructors.h:53
itk::GTest::TypedefsAndConstructors::Dimension2::PointType
ImageBaseType::PointType PointType
Definition: itkGTestTypedefsAndConstructors.h:51
itk::Versor::SetRotationAroundZ
void SetRotationAroundZ(ValueType angle)
itkImageFileReader.h
itkImage.h
itk::ChangeInformationImageFilter
Change the origin, spacing and/or region of an Image.
Definition: itkChangeInformationImageFilter.h:49
itk::Versor
A templated class holding a unit quaternion.
Definition: itkVersor.h:50
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
itkVersor.h
itkImageFileWriter.h
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:86
itk::Versor::GetMatrix
MatrixType GetMatrix() const
itk::Math::pi
static constexpr double pi
Definition: itkMath.h:64
itk::GTest::TypedefsAndConstructors::Dimension2::Dimension
constexpr unsigned int Dimension
Definition: itkGTestTypedefsAndConstructors.h:44
itkChangeInformationImageFilter.h