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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.
*
*=========================================================================*/
// Software Guide : BeginCommandLineArgs
// INPUTS: {BrainProtonDensitySlice.png}
// OUTPUTS: {ZeroCrossingBasedEdgeDetectionImageFilter.png}
// ARGUMENTS: 1.0 0.1
// Software Guide : EndCommandLineArgs
//
// Software Guide : BeginLatex
//
// The \doxygen{ZeroCrossingBasedEdgeDetectionImageFilter} performs
// edge detection by combining a sequence of Gaussian smoothing,
// Laplacian filter, and Zero crossing detections on the Laplacian.
//
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter}
//
// Software Guide : EndLatex
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
// Software Guide : BeginLatex
//
// The header file corresponding to this filter should be included first.
//
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter!header}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkZeroCrossingBasedEdgeDetectionImageFilter.h"
// Software Guide : EndCodeSnippet
#include "itkRescaleIntensityImageFilter.h"
int
main(int argc, char * argv[])
{
if (argc < 5)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0]
<< " inputImageFile outputImageFile variance maxerror"
<< std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginCodeSnippet
using InputPixelType = double;
using OutputPixelType = double;
using CharPixelType = unsigned char;
constexpr unsigned int Dimension = 2;
using InputImageType = itk::Image<InputPixelType, Dimension>;
using OutputImageType = itk::Image<OutputPixelType, Dimension>;
using CharImageType = itk::Image<CharPixelType, Dimension>;
// Software Guide : EndCodeSnippet
using ReaderType = itk::ImageFileReader<InputImageType>;
using WriterType = itk::ImageFileWriter<CharImageType>;
using RescaleFilterType =
itk::RescaleIntensityImageFilter<OutputImageType, CharImageType>;
auto reader = ReaderType::New();
auto writer = WriterType::New();
auto rescaler = RescaleFilterType::New();
reader->SetFileName(argv[1]);
writer->SetFileName(argv[2]);
using FilterType =
itk::ZeroCrossingBasedEdgeDetectionImageFilter<InputImageType,
OutputImageType>;
auto filter = FilterType::New();
// Software Guide : BeginLatex
//
// The filter requires two parameters. First the value of the variance to
// be used by the Gaussian smoothing stage. This value is provided in the
// method \code{SetVariance} and it is given in pixel units. Second the
// filter expects the acceptable error for computing the approximation to
// the Gaussian kernel. This error is expected to be in the range between 0
// and 1. Values outside that range will result in Exceptions being thrown.
//
//
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter!SetVariance}
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter!SetMaximumError}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
filter->SetVariance(std::stod(argv[3]));
filter->SetMaximumError(std::stod(argv[4]));
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// As with most filters, we connect the input and output of this
// filter in order to create a pipeline. In this particular case the
// input is taken from a reader and the output is sent to a writer.
// Given that the zero crossing filter is producing a float image as
// output, we use a \doxygen{RescaleIntensityImageFilter} to convert
// this image to an eight bits image before sending it to the writer.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
filter->SetInput(reader->GetOutput());
rescaler->SetInput(filter->GetOutput());
writer->SetInput(rescaler->GetOutput());
// Software Guide : EndCodeSnippet
rescaler->SetOutputMinimum(0);
rescaler->SetOutputMaximum(255);
try
{
writer->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
}
return EXIT_SUCCESS;
}
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