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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 "itkRandomImageSource.h"
#include "itkChangeLabelImageFilter.h"
int
itkChangeLabelImageFilterTest(int, char *[])
{
// Define the dimension of the images
constexpr unsigned int ImageDimension = 3;
// Declare the types of the images
using InputImageType = itk::Image<unsigned short, ImageDimension>;
using OutputImageType = itk::Image<unsigned char, ImageDimension>;
using InputPixelType = InputImageType::PixelType;
using OutputPixelType = OutputImageType::PixelType;
// Declare iterator type
using InputIteratorType = itk::ImageRegionIteratorWithIndex<InputImageType>;
using OutputIteratorType = itk::ImageRegionIteratorWithIndex<OutputImageType>;
// Use a random image source as input
using SourceType = itk::RandomImageSource<InputImageType>;
auto source = SourceType::New();
InputImageType::SizeValueType sizeArray[ImageDimension] = { 3, 3, 3 };
// limit to a few labels
InputPixelType upper = 10;
source->SetMin(InputPixelType{});
source->SetMax(upper);
source->SetSize(sizeArray);
// Declare the type for the binary threshold filter
using FilterType = itk::ChangeLabelImageFilter<InputImageType, OutputImageType>;
// Create a filter
auto filter = FilterType::New();
// Eliminate most labels
InputPixelType background = 0;
InputPixelType maxRemainingLabel = 2;
for (InputPixelType i = maxRemainingLabel; i <= upper; ++i)
{
filter->SetChange(i, background);
}
filter->Print(std::cout);
// exercise Get methods
// Connect the input images
filter->SetInput(source->GetOutput());
// Get the Smart Pointer to the Filter Output
OutputImageType::Pointer outputImage = filter->GetOutput();
// Execute the filter
try
{
filter->Update();
filter->SetFunctor(filter->GetFunctor());
}
catch (...)
{
std::cerr << "Caught an unexpected exception. " << std::endl;
std::cerr << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// Create an iterator for going through the image output
InputIteratorType it(source->GetOutput(), source->GetOutput()->GetRequestedRegion());
OutputIteratorType ot(outputImage, outputImage->GetRequestedRegion());
bool pass = true;
// Check the content of the result image
std::cout << "Verification of the output " << std::endl;
ot.GoToBegin();
it.GoToBegin();
while (!ot.IsAtEnd())
{
const InputPixelType input = it.Get();
const OutputPixelType output = ot.Get();
std::cout << static_cast<double>(input) << ' ' << static_cast<double>(output) << std::endl;
if (output > maxRemainingLabel)
{
pass = false;
}
if (!pass)
{
std::cerr << "Error in itkChangeLaelImageFilterTest " << std::endl;
std::cerr << " input = " << input;
std::cerr << " output = " << output;
std::cerr << std::endl;
return EXIT_FAILURE;
}
++ot;
++it;
}
// Test to see if clearing the changemap works
filter->ClearChangeMap();
// reexecute the filter
try
{
filter->Update();
}
catch (...)
{
std::cerr << "Caught an unexpected exception. " << std::endl;
std::cerr << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// Create an iterator for going through the image output
InputIteratorType ita(source->GetOutput(), source->GetOutput()->GetRequestedRegion());
OutputIteratorType ota(outputImage, outputImage->GetRequestedRegion());
// Check the content of the result image
// Since the change map is clear, input is expected to be the same as output
std::cout << "Verification of the output " << std::endl;
ota.GoToBegin();
ita.GoToBegin();
while (!ota.IsAtEnd())
{
const InputPixelType input = ita.Get();
const OutputPixelType output = ota.Get();
std::cout << static_cast<double>(input) << ' ' << static_cast<double>(output) << std::endl;
if (input != output)
{
pass = false;
}
if (!pass)
{
std::cerr << "Error in itkChangeLaelImageFilterTest " << std::endl;
std::cerr << " input = " << input;
std::cerr << " output = " << output;
std::cerr << std::endl;
return EXIT_FAILURE;
}
++ota;
++ita;
}
if (pass)
{
std::cout << "Test passed. " << std::endl;
return EXIT_SUCCESS;
}
else
{
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
}
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