ITK  5.3.0
Insight Toolkit
SphinxExamples/src/Filtering/ImageGrid/ShrinkImage/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);
std::cout << "Original size: " << image->GetLargestPossibleRegion().GetSize() << std::endl;
using ShrinkImageFilterType = itk::ShrinkImageFilter<ImageType, ImageType>;
ShrinkImageFilterType::Pointer shrinkFilter = ShrinkImageFilterType::New();
shrinkFilter->SetInput(image);
shrinkFilter->SetShrinkFactor(0, 2); // shrink the first dimension by a factor of 2 (i.e. 100 gets changed to 50)
shrinkFilter->SetShrinkFactor(1, 3); // shrink the second dimension by a factor of 3 (i.e. 100 gets changed to 33)
shrinkFilter->Update();
std::cout << "New size: " << shrinkFilter->GetOutput()->GetLargestPossibleRegion().GetSize() << std::endl;
return EXIT_SUCCESS;
}
void
CreateImage(ImageType::Pointer image)
{
// Create an image with 2 connected components
start.Fill(0);
size.Fill(100);
ImageType::RegionType region(start, size);
image->SetRegions(region);
image->Allocate();
image->FillBuffer(0);
// Make a white square
for (unsigned int r = 20; r < 80; r++)
{
for (unsigned int c = 20; c < 30; c++)
{
pixelIndex[0] = r;
pixelIndex[1] = c;
image->SetPixel(pixelIndex, 255);
}
}
}
itk::GTest::TypedefsAndConstructors::Dimension2::SizeType
ImageBaseType::SizeType SizeType
Definition: itkGTestTypedefsAndConstructors.h:49
itkImage.h
itk::Index::Fill
void Fill(IndexValueType value)
Definition: itkIndex.h:271
itk::Size::Fill
void Fill(SizeValueType value)
Definition: itkSize.h:211
itk::GTest::TypedefsAndConstructors::Dimension2::IndexType
ImageBaseType::IndexType IndexType
Definition: itkGTestTypedefsAndConstructors.h:50
itk::GTest::TypedefsAndConstructors::Dimension2::RegionType
ImageBaseType::RegionType RegionType
Definition: itkGTestTypedefsAndConstructors.h:54
itk::ShrinkImageFilter
Reduce the size of an image by an integer factor in each dimension.
Definition: itkShrinkImageFilter.h:68
itkRescaleIntensityImageFilter.h
itkShrinkImageFilter.h
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:88