ITK  5.2.0
Insight Toolkit
SphinxExamples/src/Filtering/Thresholding/ThresholdAnImageUsingOtsu/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.
*
*=========================================================================*/
int
main(int argc, char * argv[])
{
if (argc < 6)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << std::endl;
std::cerr << " <InputImage> <OutputImage> <NumberOfBins>";
std::cerr << " <NumberOfThresholds> <LabelOffset>" << std::endl;
return EXIT_FAILURE;
}
constexpr unsigned int Dimension = 2;
using PixelType = unsigned char;
const char * InputImage = argv[1];
const char * OutputImage = argv[2];
const auto NumberOfHistogramBins = static_cast<SizeType>(atoi(argv[3]));
const auto NumberOfThresholds = static_cast<SizeType>(atoi(argv[4]));
const auto LabelOffset = static_cast<PixelType>(atoi(argv[5]));
using ReaderType = itk::ImageFileReader<ImageType>;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(InputImage);
FilterType::Pointer filter = FilterType::New();
filter->SetInput(reader->GetOutput());
filter->SetNumberOfHistogramBins(NumberOfHistogramBins);
filter->SetNumberOfThresholds(NumberOfThresholds);
filter->SetLabelOffset(LabelOffset);
FilterType::ThresholdVectorType thresholds = filter->GetThresholds();
std::cout << "Thresholds:" << std::endl;
for (double threshold : thresholds)
{
std::cout << threshold << std::endl;
}
std::cout << std::endl;
RescaleType::Pointer rescaler = RescaleType::New();
rescaler->SetInput(filter->GetOutput());
rescaler->SetOutputMinimum(0);
rescaler->SetOutputMaximum(255);
using WriterType = itk::ImageFileWriter<ImageType>;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName(OutputImage);
writer->SetInput(rescaler->GetOutput());
try
{
writer->Update();
}
catch (itk::ExceptionObject & e)
{
std::cerr << "Error: " << e << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
itkImageFileReader.h
itk::GTest::TypedefsAndConstructors::Dimension2::SizeType
ImageBaseType::SizeType SizeType
Definition: itkGTestTypedefsAndConstructors.h:49
itk::OtsuMultipleThresholdsImageFilter
Threshold an image using multiple Otsu Thresholds.
Definition: itkOtsuMultipleThresholdsImageFilter.h:61
itk::ImageFileReader
Data source that reads image data from a single file.
Definition: itkImageFileReader.h:75
itkOtsuMultipleThresholdsImageFilter.h
itk::ImageFileWriter
Writes image data to a single file.
Definition: itkImageFileWriter.h:87
itkRescaleIntensityImageFilter.h
itkImageFileWriter.h
itk::RescaleIntensityImageFilter
Applies a linear transformation to the intensity levels of the input Image.
Definition: itkRescaleIntensityImageFilter.h:154
itk::Math::e
static constexpr double e
Definition: itkMath.h:54
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:86
itk::GTest::TypedefsAndConstructors::Dimension2::Dimension
constexpr unsigned int Dimension
Definition: itkGTestTypedefsAndConstructors.h:44
itk::SizeValueType
unsigned long SizeValueType
Definition: itkIntTypes.h:83