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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.
*/
/* Example usage:
./ShapedNeighborhoodIterators2 Input/BinaryImage.png \
Output/ShapedNeighborhoodIterators1b.png \
4
*/
#include "otbImage.h"
#include "otbImageFileReader.h"
#include "otbImageFileWriter.h"
#include "itkConstShapedNeighborhoodIterator.h"
#include "itkImageRegionIterator.h"
#include "itkNeighborhoodAlgorithm.h"
#include <math.h>
int main(int argc, char* argv[])
{
if (argc < 4)
{
std::cerr << "Missing parameters. " << std::endl;
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFile outputImageFile element_radius" << std::endl;
return -1;
}
using PixelType = unsigned char;
using ImageType = otb::Image<PixelType, 2>;
using ReaderType = otb::ImageFileReader<ImageType>;
using ShapedNeighborhoodIteratorType = itk::ConstShapedNeighborhoodIterator<ImageType>;
using IteratorType = itk::ImageRegionIterator<ImageType>;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(argv[1]);
unsigned int element_radius = ::atoi(argv[3]);
try
{
reader->Update();
}
catch (itk::ExceptionObject& err)
{
std::cout << "ExceptionObject caught !" << std::endl;
std::cout << err << std::endl;
return -1;
}
ImageType::Pointer output = ImageType::New();
output->SetRegions(reader->GetOutput()->GetRequestedRegion());
output->Allocate();
using FaceCalculatorType = itk::NeighborhoodAlgorithm::ImageBoundaryFacesCalculator<ImageType>;
FaceCalculatorType faceCalculator;
FaceCalculatorType::FaceListType faceList;
FaceCalculatorType::FaceListType::iterator fit;
ShapedNeighborhoodIteratorType::RadiusType radius;
radius.Fill(element_radius);
faceList = faceCalculator(reader->GetOutput(), output->GetRequestedRegion(), radius);
IteratorType out;
const float rad = static_cast<float>(element_radius);
const PixelType background_value = 0;
const PixelType foreground_value = 255;
for (fit = faceList.begin(); fit != faceList.end(); ++fit)
{
ShapedNeighborhoodIteratorType it(radius, reader->GetOutput(), *fit);
out = IteratorType(output, *fit);
// Creates a circular structuring element by activating all the pixels less
// than radius distance from the center of the neighborhood.
for (float y = -rad; y <= rad; y++)
{
for (float x = -rad; x <= rad; x++)
{
ShapedNeighborhoodIteratorType::OffsetType off;
float dis = ::sqrt(x * x + y * y);
if (dis <= rad)
{
off[0] = static_cast<int>(x);
off[1] = static_cast<int>(y);
it.ActivateOffset(off);
}
}
}
// The logic of the inner loop can be rewritten to perform
// dilation. Dilation of the set $I$ by $E$ is the set of all $x$ such that
// $E$ positioned at $x$ contains at least one element in $I$.
// Implements dilation
for (it.GoToBegin(), out.GoToBegin(); !it.IsAtEnd(); ++it, ++out)
{
ShapedNeighborhoodIteratorType::ConstIterator ci;
bool flag = false;
for (ci = it.Begin(); ci != it.End(); ci++)
{
if (ci.Get() != background_value)
{
flag = true;
break;
}
}
if (flag == true)
{
out.Set(foreground_value);
}
else
{
out.Set(background_value);
}
}
}
// The output image is written and visualized directly as a binary image of
// \code{unsigned chars}. Figure~\ref{fig:ShapedNeighborhoodExample2}
// illustrates the results of dilation on the image
// \code{Examples/Data/BinaryImage.png}. Applying erosion and dilation
// in sequence effects the morphological operations of opening and closing.
//
// \begin{figure} \centering
// \includegraphics[width=0.18\textwidth]{BinaryImage.eps}
// %\includegraphics[width=0.18\textwidth]{ShapedNeighborhoodIterators1a.eps}
// \includegraphics[width=0.18\textwidth]{ShapedNeighborhoodIterators1b.eps}
// %\includegraphics[width=0.18\textwidth]{ShapedNeighborhoodIterators1c.eps}
// %\includegraphics[width=0.18\textwidth]{ShapedNeighborhoodIterators1d.eps}
// \itkcaption[Binary image morphology]{The effects of morphological operations
// on a binary image using a circular structuring element of size 4.
// Left: original image. Right: dilation.}
// \protect\label{fig:ShapedNeighborhoodExample2}
// \end{figure}
using WriterType = otb::ImageFileWriter<ImageType>;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName(argv[2]);
writer->SetInput(output);
try
{
writer->Update();
}
catch (itk::ExceptionObject& err)
{
std::cout << "ExceptionObject caught !" << std::endl;
std::cout << err << std::endl;
return -1;
}
return EXIT_SUCCESS;
}
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