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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 : BeginLatex
//
// This example illustrates how to use the \doxygen{PolyLineParametricPath}.
// This class will typically be used for representing in a concise way the
// output of an image segmentation algorithm in 2D. The
// \code{PolyLineParametricPath} however could also be used for representing
// any open or close curve in N-Dimensions as a linear piece-wise
// approximation.
//
//
// First, the header file of the \code{PolyLineParametricPath} class must be
// included.
//
// Software Guide : EndLatex
#include "itkImage.h"
#include "itkImageFileReader.h"
// Software Guide : BeginCodeSnippet
#include "itkPolyLineParametricPath.h"
// Software Guide : EndCodeSnippet
int
main(int argc, char * argv[])
{
if (argc < 2)
{
std::cerr << "Missing arguments" << std::endl;
std::cerr << "Usage: PolyLineParametricPath inputImageFileName"
<< std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginLatex
//
// The path is instantiated over the dimension of the image.
// In this example the image and path are two-dimensional.
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
constexpr unsigned int Dimension = 2;
using ImageType = itk::Image<unsigned char, Dimension>;
using PathType = itk::PolyLineParametricPath<Dimension>;
// Software Guide : EndCodeSnippet
using ReaderType = itk::ImageFileReader<ImageType>;
auto reader = ReaderType::New();
reader->SetFileName(argv[1]);
try
{
reader->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cout << "Problem reading the input image " << std::endl;
std::cout << excp << std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginCodeSnippet
ImageType::ConstPointer image = reader->GetOutput();
auto path = PathType::New();
path->Initialize();
using ContinuousIndexType = PathType::ContinuousIndexType;
ContinuousIndexType cindex;
using ImagePointType = ImageType::PointType;
ImagePointType origin = image->GetOrigin();
ImageType::SpacingType spacing = image->GetSpacing();
ImageType::SizeType size = image->GetBufferedRegion().GetSize();
ImagePointType point;
point[0] = origin[0] + spacing[0] * size[0];
point[1] = origin[1] + spacing[1] * size[1];
using ContinuousIndexValueType = ContinuousIndexType::ValueType;
cindex =
image->TransformPhysicalPointToContinuousIndex<ContinuousIndexValueType>(
origin);
path->AddVertex(cindex);
cindex =
image->TransformPhysicalPointToContinuousIndex<ContinuousIndexValueType>(
point);
path->AddVertex(cindex);
// Software Guide : EndCodeSnippet
return EXIT_SUCCESS;
}
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