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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.
*/
// The \doxygen{otb}{Image} class with a vector pixel type could be
// used for representing multispectral images, with one band per
// vector component, however, this is not a practical way, since the
// dimensionality of the vector must be known at compile time. OTB
// offers the \doxygen{otb}{VectorImage} where the dimensionality of
// the vector stored for each pixel can be chosen at runtime. This is
// needed for the image file readers in order to dynamically set the
// number of bands of an image read from a file.
//
// The OTB Readers and Writers are able to deal with
// \doxygen{otb}{VectorImage}s transparently for the user.
//
// The first step for performing reading and writing is to include the
// following headers.
//
// \index{otb::ImageFileReader}
// \index{otb::ImageFileReader!header}
//
// \index{otb::ImageFileWriter}
// \index{otb::ImageFileWriter!header}
#include "otbImageFileReader.h"
#include "otbImageFileWriter.h"
#include "otbImage.h"
#include "otbVectorImage.h"
int main(int argc, char* argv[])
{
// Verify the number of parameters in the command line
if (argc < 3)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFile outputImageFile " << std::endl;
return EXIT_FAILURE;
}
// Then, as usual, a decision must be made about the type of pixel used to
// represent the image processed by the pipeline. The pixel type
// corresponds to the scalar type stored in the vector
// components. Therefore, for a multiband Pl\'eiades image we will
// do:
//
using PixelType = unsigned short;
const unsigned int Dimension = 2;
using ImageType = otb::VectorImage<PixelType, Dimension>;
// We can now instantiate the types of the reader and writer. These two
// classes are parameterized over the image type.
//
// \index{otb::ImageFileReader!Instantiation}
// \index{otb::ImageFileWriter!Instantiation}
using ReaderType = otb::ImageFileReader<ImageType>;
using WriterType = otb::ImageFileWriter<ImageType>;
// Then, we create one object of each type using the New() method and
// assigning the result to a \doxygen{itk}{SmartPointer}.
//
// \index{otb::ImageFileReader!New()}
// \index{otb::ImageFileWriter!New()}
// \index{otb::ImageFileReader!SmartPointer}
// \index{otb::ImageFileWriter!SmartPointer}
ReaderType::Pointer reader = ReaderType::New();
WriterType::Pointer writer = WriterType::New();
// Here we recover the file names from the command line arguments
//
const char* inputFilename = argv[1];
const char* outputFilename = argv[2];
// The name of the file to be read or written is passed with the
// SetFileName() method.
//
// \index{otb::ImageFileReader!SetFileName()}
// \index{otb::ImageFileWriter!SetFileName()}
// \index{SetFileName()!otb::ImageFileReader}
// \index{SetFileName()!otb::ImageFileWriter}
reader->SetFileName(inputFilename);
writer->SetFileName(outputFilename);
// We can now connect these readers and writers to filters to create a
// pipeline. The only thig to take care of is, when executing the
// program, choosing an output image file format which supports
// multiband images.
writer->SetInput(reader->GetOutput());
try
{
writer->Update();
}
catch (itk::ExceptionObject& err)
{
std::cerr << "ExceptionObject caught !" << std::endl;
std::cerr << err << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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