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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 "otbImageFileReader.h"
#include "itkBinaryFunctorImageFilter.h"
#include "otbImageFileWriter.h"
#include "otbVectorDataFileWriter.h"
/* Example usage:
./LineSegmentDetectorExample Input/Scene.png Output/LSDOutput.shp
*/
// This example illustrates the use of the LineSegmentDetector.
// This filter is designed to extract segments in mono channel images.
#include "otbLineSegmentDetector.h"
int main(int argc, char* argv[])
{
if (argc != 3)
{
std::cerr << "Usage: ./LineSegmentDetectorExample input output\n";
return EXIT_FAILURE;
}
const char* infname = argv[1];
const char* outfname = argv[2];
using InputPixelType = unsigned char;
using PrecisionType = double;
const unsigned int Dimension = 2;
// As usual, we start by defining the types for the input image and
// the image file reader.
using ImageType = otb::Image<InputPixelType, Dimension>;
using ReaderType = otb::ImageFileReader<ImageType>;
// We instantiate the reader and set the file name for the input image.
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(infname);
reader->GenerateOutputInformation();
// We define now the type for the segment detector filter. It is
// templated over the input image type and the precision with which
// the coordinates of the detected segments will be given. It is
// recommended to set this precision to a real type. The output of the
// filter will be a \doxygen{otb}{VectorData}.
using LsdFilterType = otb::LineSegmentDetector<ImageType, PrecisionType>;
LsdFilterType::Pointer lsdFilter = LsdFilterType::New();
// We can now define the type for the writer, instantiate it and set
// the file name for the output vector data.
using WriterType = otb::VectorDataFileWriter<LsdFilterType::VectorDataType>;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName(outfname);
// We plug the pipeline.
lsdFilter->SetInput(reader->GetOutput());
writer->SetInput(lsdFilter->GetOutput());
// Before calling the Update() method of the writer in order to
// trigger the pipeline execution, we call the
// GenerateOutputInformation() of the reader, so the LSD
// filter gets the information about image size and spacing.
reader->GenerateOutputInformation();
writer->Update();
return EXIT_SUCCESS;
}
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