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/*=========================================================================
*
* 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
*
* https://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 <iostream>
#include "itkExtractImageFilter.h"
#include "itkRandomImageSource.h"
#include "itkMath.h"
int
itkExtractImage3Dto2DTest(int, char *[])
{
using Image3DType = itk::Image<unsigned char, 3>;
using Image2DType = itk::Image<unsigned char, 2>;
using ExtractType = itk::ExtractImageFilter<Image3DType, Image2DType>;
using RandomImageSourceType = itk::RandomImageSource<Image3DType>;
auto src = RandomImageSourceType::New();
src->SetMin(0);
src->SetMax(255);
Image3DType::SizeType size = { { 16, 16, 16 } };
src->SetSize(size);
src->Update();
Image3DType::Pointer im3d(src->GetOutput());
Image3DType::DirectionType dir = im3d->GetDirection();
dir[1][1] = 0.0;
dir[1][2] = 1.0;
dir[2][1] = 1.0;
dir[2][2] = 0.0;
// change directions to
// 1 0 0
// 0 0 1
// 0 1 0
im3d->SetDirection(dir);
auto extract = ExtractType::New();
extract->SetDirectionCollapseToIdentity();
Image3DType::RegionType extractRegion = im3d->GetLargestPossibleRegion();
Image3DType::SizeType extractSize = extractRegion.GetSize();
extractSize[2] = 0;
Image3DType::IndexType extractIndex;
extractIndex[2] = extractIndex[1] = extractIndex[0] = 0;
extract->SetInput(im3d);
extractRegion.SetSize(extractSize);
extractRegion.SetIndex(extractIndex);
extract->SetExtractionRegion(extractRegion);
extract->Update();
Image2DType::Pointer extractedImage = extract->GetOutput();
Image2DType::DirectionType identity;
identity.SetIdentity();
if (extractedImage->GetDirection() != identity)
{
return EXIT_FAILURE;
}
// check CollapseToSubmatrix
extract = ExtractType::New();
extract->SetDirectionCollapseToSubmatrix();
extractRegion = im3d->GetLargestPossibleRegion();
extractSize = extractRegion.GetSize();
extractSize[0] = 0;
extractIndex[2] = extractIndex[1] = extractIndex[0] = 0;
extract->SetInput(im3d);
extractRegion.SetSize(extractSize);
extractRegion.SetIndex(extractIndex);
extract->SetExtractionRegion(extractRegion);
extract->Update();
// remove first column/row, should obtain :
// 0 1
// 1 0
if (itk::Math::NotExactlyEquals(extract->GetOutput()->GetDirection()[0][0], 0) ||
itk::Math::NotExactlyEquals(extract->GetOutput()->GetDirection()[1][1], 0) ||
itk::Math::NotExactlyEquals(extract->GetOutput()->GetDirection()[0][1], 1) ||
itk::Math::NotExactlyEquals(extract->GetOutput()->GetDirection()[1][0], 1))
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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