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itkSliceBySliceImageFilterTest.cxx
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itkSliceBySliceImageFilterTest.cxx
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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 "itkSliceBySliceImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkSimpleFilterWatcher.h"
#include "itkPipelineMonitorImageFilter.h"
#include "itkTestingMacros.h"
#include "itkMedianImageFilter.h"
void
sliceCallBack(itk::Object * object, const itk::EventObject &, void *)
{
// the same type alias than in the main function - should be done in a nicer way
constexpr int Dimension = 3;
using PixelType = unsigned char;
using ImageType = itk::Image<PixelType, Dimension>;
using FilterType = itk::SliceBySliceImageFilter<ImageType, ImageType>;
using MedianType = itk::MedianImageFilter<FilterType::InternalInputImageType, FilterType::InternalOutputImageType>;
// real stuff begins here
// get the slice by slice filter and the median filter
auto * filter = dynamic_cast<FilterType *>(object);
auto * median = dynamic_cast<MedianType *>(filter->GetModifiableInputFilter());
// std::cout << "callback! slice: " << filter->GetSliceIndex() << std::endl;
// set half of the slice number as radius
MedianType::InputSizeType radius;
radius.Fill(filter->GetSliceIndex() / 2);
median->SetRadius(radius);
}
int
itkSliceBySliceImageFilterTest(int argc, char * argv[])
{
if (argc != 4)
{
std::cerr << "usage: " << itkNameOfTestExecutableMacro(argv) << " input output slicingDimension" << std::endl;
return EXIT_FAILURE;
}
constexpr int Dimension = 3;
using PixelType = unsigned char;
using ImageType = itk::Image<PixelType, Dimension>;
using ReaderType = itk::ImageFileReader<ImageType>;
auto reader = ReaderType::New();
reader->SetFileName(argv[1]);
using FilterType = itk::SliceBySliceImageFilter<ImageType, ImageType>;
auto filter = FilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, SliceBySliceImageFilter, ImageToImageFilter);
filter->DebugOn();
filter->SetInput(reader->GetOutput());
using MedianType = itk::MedianImageFilter<FilterType::InternalInputImageType, FilterType::InternalOutputImageType>;
auto median = MedianType::New();
filter->SetFilter(median);
ITK_TEST_SET_GET_VALUE(median, filter->GetFilter());
using MonitorType = itk::PipelineMonitorImageFilter<FilterType::InternalOutputImageType>;
auto monitor = MonitorType::New();
itk::CStyleCommand::Pointer command = itk::CStyleCommand::New();
command->SetCallback(*sliceCallBack);
filter->AddObserver(itk::IterationEvent(), command);
itk::SimpleFilterWatcher watcher(filter, "filter");
using WriterType = itk::ImageFileWriter<ImageType>;
auto writer = WriterType::New();
writer->SetInput(filter->GetOutput());
writer->SetFileName(argv[2]);
unsigned int slicingDimension;
std::istringstream istrm(argv[3]);
istrm >> slicingDimension;
filter->SetDimension(slicingDimension);
ITK_TEST_SET_GET_VALUE(slicingDimension, filter->GetDimension());
try
{
writer->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
// set up a requested region of just one pixel and verify that was
// all that was produced.
std::cout << "Testing with requested region..." << std::endl;
ImageType::Pointer temp = filter->GetOutput();
temp->DisconnectPipeline();
temp = nullptr;
ImageType::RegionType rr = reader->GetOutput()->GetLargestPossibleRegion();
for (unsigned int i = 0; i < ImageType::ImageDimension; ++i)
{
rr.SetIndex(i, rr.GetIndex(i) + rr.GetSize(i) / 2);
rr.SetSize(i, 1);
}
monitor->SetInput(median->GetOutput());
filter->SetOutputFilter(monitor);
ITK_TEST_SET_GET_VALUE(monitor, filter->GetOutputFilter());
filter->GetOutput()->SetRequestedRegion(rr);
try
{
filter->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
// check that one slice executed is just one pixel and the input
// filter just update that region
ITK_TEST_EXPECT_EQUAL(monitor->GetNumberOfUpdates(), 1);
ITK_TEST_EXPECT_EQUAL(monitor->GetOutputRequestedRegions()[0].GetNumberOfPixels(), 1);
ITK_TEST_EXPECT_TRUE(monitor->VerifyAllInputCanStream(1));
//
// Test that a sliced version of the input image information is passed
// through to the internal filters, with proper origin and
// spacing. We are setting the input image to have a non-zero
// starting index.
//
auto image = ImageType::New();
{
ImageType::RegionType region = reader->GetOutput()->GetLargestPossibleRegion();
region.SetIndex(0, 10);
image->SetRegions(region);
image->AllocateInitialized();
}
ImageType::SpacingType spacing;
ImageType::PointType origin;
for (unsigned int i = 0; i < ImageType::ImageDimension; ++i)
{
spacing[i] = i + 0.1;
origin[i] = i + 0.2;
}
image->SetSpacing(spacing);
image->SetOrigin(origin);
filter->SetInput(image);
filter->Update();
FilterType::InternalInputImageType::SpacingType expectedInternalSpacing;
FilterType::InternalInputImageType::PointType expectedInternalOrigin;
for (unsigned int i = 0, internal_i = 0; internal_i < FilterType::InternalImageDimension; ++i, ++internal_i)
{
if (i == slicingDimension)
{
++i;
}
expectedInternalSpacing[internal_i] = spacing[i];
expectedInternalOrigin[internal_i] = origin[i];
}
ITK_TEST_EXPECT_EQUAL(monitor->GetUpdatedOutputSpacing(), expectedInternalSpacing);
ITK_TEST_EXPECT_EQUAL(monitor->GetUpdatedOutputOrigin(), expectedInternalOrigin);
//
// Exercise exceptions
//
bool caughtException;
auto badFilter = FilterType::New();
std::cout << "Testing with no filter set..." << std::endl;
badFilter->SetInput(reader->GetOutput());
caughtException = false;
try
{
badFilter->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cout << "Caught expected exception" << std::endl;
std::cout << excp << std::endl;
caughtException = true;
}
if (!caughtException)
{
return EXIT_FAILURE;
}
std::cout << "Testing with no output filter set..." << std::endl;
badFilter->SetInput(reader->GetOutput());
badFilter->SetInputFilter(median);
ITK_TEST_SET_GET_VALUE(median, badFilter->GetInputFilter());
caughtException = false;
try
{
badFilter->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cout << "Caught expected exception" << std::endl;
std::cout << excp << std::endl;
caughtException = true;
}
if (!caughtException)
{
return EXIT_FAILURE;
}
// check nullptr input/output
ITK_TRY_EXPECT_EXCEPTION(badFilter->SetInputFilter(nullptr));
ITK_TRY_EXPECT_EXCEPTION(badFilter->SetOutputFilter(nullptr));
return EXIT_SUCCESS;
}