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/*
* Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* 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
*
* 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 "itkMacro.h"
#include "otbImage.h"
#include "otbImageFileReader.h"
/* Example usage:
./ComplexMomentPathExample 1 1
*/
// The complex moments can be computed on images, but sometimes we are
// interested in computing them on shapes extracted from images by
// segmentation algorithms. These shapes can be represented by
// \doxygen{itk}{Path}s. This example illustrates the use of the
// \doxygen{otb}{ComplexMomentPathFunction} for the computation of
// complex geometric moments on ITK paths.
//
// The first step required to use this filter is to include its header file.
#include "otbComplexMomentPathFunction.h"
#include "itkPolyLineParametricPath.h"
int main(int argc, char* argv[])
{
if (argc != 3)
{
std::cerr << "Usage: " << argv[0];
std::cerr << " p q" << std::endl;
return EXIT_FAILURE;
}
unsigned int P((unsigned char)::atoi(argv[1]));
unsigned int Q((unsigned char)::atoi(argv[2]));
// The \doxygen{otb}{ComplexMomentPathFunction} is templated over the
// input path type and the output complex type value, so we start by
// defining:
const unsigned int Dimension = 2;
using PathType = itk::PolyLineParametricPath<Dimension>;
using ComplexType = std::complex<double>;
using CMType = otb::ComplexMomentPathFunction<PathType, ComplexType>;
CMType::Pointer cmFunction = CMType::New();
PathType::Pointer path = PathType::New();
path->Initialize();
using ContinuousIndexType = PathType::ContinuousIndexType;
ContinuousIndexType cindex;
// Draw a square:
path->Initialize();
cindex[0] = 30;
cindex[1] = 30;
path->AddVertex(cindex);
cindex[0] = 30;
cindex[1] = 130;
path->AddVertex(cindex);
cindex[0] = 130;
cindex[1] = 130;
path->AddVertex(cindex);
cindex[0] = 130;
cindex[1] = 30;
path->AddVertex(cindex);
// Next, we set the parameters of the plug the input path into the complex moment function
// and we set its parameters.
cmFunction->SetInputPath(path);
cmFunction->SetQ(Q);
cmFunction->SetP(P);
// Since the paths are defined in physical coordinates, we do not
// need to set the center for the moment computation as we did
// with the \doxygen{otb}{ComplexMomentImageFunction}. The same
// applies for the size of the neighborhood around the
// center pixel for the moment computation. The moment computation
// is triggered by calling the \code{Evaluate} method.
ComplexType Result = cmFunction->Evaluate();
std::cout << "The moment of order (" << P << "," << Q << ") is equal to " << Result << std::endl;
return EXIT_SUCCESS;
}
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