ITK  5.2.0
Insight Toolkit
SphinxExamples/src/Core/Transform/ScaleAnImage/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.
*
*=========================================================================*/
#include "itkImage.h"
using ImageType = itk::Image<unsigned char, 2>;
static void
CreateImage(ImageType::Pointer image);
int
main(int, char *[])
{
ImageType::Pointer image = ImageType::New();
CreateImage(image);
using WriterType = itk::ImageFileWriter<ImageType>;
WriterType::Pointer inputWriter = WriterType::New();
inputWriter->SetFileName("input.png");
inputWriter->SetInput(image);
inputWriter->Update();
// using TransformType = itk::ScaleTransform<float, 2>; // If you want to use float here, you must use:
// using ResampleImageFilterType = itk::ResampleImageFilter<ImageType, ImageType, float>; later.
using TransformType = itk::ScaleTransform<double, 2>;
TransformType::Pointer scaleTransform = TransformType::New();
scale[0] = 1.5; // newWidth/oldWidth
scale[1] = 1.5;
scaleTransform->SetScale(scale);
center[0] = image->GetLargestPossibleRegion().GetSize()[0] / 2;
center[1] = image->GetLargestPossibleRegion().GetSize()[1] / 2;
scaleTransform->SetCenter(center);
using ResampleImageFilterType = itk::ResampleImageFilter<ImageType, ImageType>;
ResampleImageFilterType::Pointer resampleFilter = ResampleImageFilterType::New();
resampleFilter->SetTransform(scaleTransform);
resampleFilter->SetInput(image);
resampleFilter->SetSize(image->GetLargestPossibleRegion().GetSize());
resampleFilter->Update();
WriterType::Pointer outputWriter = WriterType::New();
outputWriter->SetFileName("output.png");
outputWriter->SetInput(resampleFilter->GetOutput());
outputWriter->Update();
return EXIT_SUCCESS;
}
void
CreateImage(ImageType::Pointer image)
{
start.Fill(0);
size.Fill(101);
ImageType::RegionType region(start, size);
image->SetRegions(region);
image->Allocate();
image->FillBuffer(0);
// Make a white square
for (unsigned int r = 40; r < 60; r++)
{
for (unsigned int c = 40; c < 60; c++)
{
pixelIndex[0] = r;
pixelIndex[1] = c;
image->SetPixel(pixelIndex, 255);
}
}
itk::ImageRegionIterator<ImageType> imageIterator(image, image->GetLargestPossibleRegion());
// Draw a white border
while (!imageIterator.IsAtEnd())
{
if (imageIterator.GetIndex()[0] == 0 ||
imageIterator.GetIndex()[0] == static_cast<int>(image->GetLargestPossibleRegion().GetSize()[0]) - 1 ||
imageIterator.GetIndex()[1] == 0 ||
imageIterator.GetIndex()[1] == static_cast<int>(image->GetLargestPossibleRegion().GetSize()[1]) - 1)
{
imageIterator.Set(255);
}
++imageIterator;
}
}
itk::Index
Represent a n-dimensional index in a n-dimensional image.
Definition: itkIndex.h:66
itk::Size< 2 >
itkImageFileReader.h
itkImage.h
itk::ScaleTransform
Scale transformation of a vector space (e.g. space coordinates)
Definition: itkScaleTransform.h:41
itk::Index::Fill
void Fill(IndexValueType value)
Definition: itkIndex.h:270
itk::Size::Fill
void Fill(SizeValueType value)
Definition: itkSize.h:211
itk::ImageRegionIterator
A multi-dimensional iterator templated over image type that walks a region of pixels.
Definition: itkImageRegionIterator.h:80
itk::GTest::TypedefsAndConstructors::Dimension2::IndexType
ImageBaseType::IndexType IndexType
Definition: itkGTestTypedefsAndConstructors.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
itk::ImageRegionIterator::Set
void Set(const PixelType &value) const
Definition: itkImageRegionIterator.h:116
itk::FixedArray
Simulate a standard C array with copy semantics.
Definition: itkFixedArray.h:52
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
itkScaleTransform.h