text: /*
   * Copyright (C) 2005-2017 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.
   */
  
  #ifndef otbHooverMatrixFilter_hxx
  #define otbHooverMatrixFilter_hxx
  
  #include "otbHooverMatrixFilter.h"
  
  namespace otb
  {
  
  /** Constructor */
  template <class TLabelMap>
  HooverMatrixFilter<TLabelMap>
  ::HooverMatrixFilter() : m_NumberOfRegionsGT(0), m_NumberOfRegionsMS(0)
  {
    this->SetNumberOfRequiredInputs(2);
    m_Matrix.SetSize(0, 0);
  }
  
  /** Set the ground truth label map */
  template <class TLabelMap>
  void HooverMatrixFilter<TLabelMap>
  ::SetGroundTruthLabelMap(const LabelMapType *gt)
  {
    this->SetInput(0, gt);
  }
  
  /** Set the machine segmentation label map */
  template <class TLabelMap>
  void HooverMatrixFilter<TLabelMap>
  ::SetMachineSegmentationLabelMap(const LabelMapType *ms)
  {
    this->SetInput(1, ms);
  }
  
  /** Get the ground truth label map */
  template <class TLabelMap>
  const TLabelMap* HooverMatrixFilter<TLabelMap>
  ::GetGroundTruthLabelMap()
  {
    return this->GetInput(0);
  }
  
  /** Get the machine segmentation label map */
  template <class TLabelMap>
  const TLabelMap* HooverMatrixFilter<TLabelMap>
  ::GetMachineSegmentationLabelMap()
  {
    return this->GetInput(1);
  }
  
  template <class TLabelMap>
  void HooverMatrixFilter<TLabelMap>
  ::BeforeThreadedGenerateData()
  {
    // first : call superclass method
    Superclass::BeforeThreadedGenerateData();
  
    // Set the matrix size
    m_NumberOfRegionsGT = this->GetGroundTruthLabelMap()->GetNumberOfLabelObjects();
    m_NumberOfRegionsMS = this->GetMachineSegmentationLabelMap()->GetNumberOfLabelObjects();
    m_LabelsGT = this->GetGroundTruthLabelMap()->GetLabels();
    m_Matrix.SetSize(m_NumberOfRegionsGT , m_NumberOfRegionsMS);
    m_Matrix.Fill(0);
  }
  
  template <class TLabelMap>
  void HooverMatrixFilter<TLabelMap>
  ::ThreadedProcessLabelObject( LabelObjectType * labelObject )
  {
  
  
    unsigned long currentRegionMS = 0;
    unsigned long currentRegionGT = 0;
    // find the index of the current GT region
    LabelType currentLabelGT = labelObject->GetLabel();
    for (unsigned long k=0; k<m_NumberOfRegionsGT; k++)
      {
      if (currentLabelGT == m_LabelsGT[k])
        {
        currentRegionGT = k;
        break;
        }
      }
  
    // loop over the given region
    typedef typename LabelObjectType::ConstLineIterator IteratorType;
    IteratorType lit = IteratorType( labelObject );
    while ( !lit.IsAtEnd() )
      {
      IndexType idx = lit.GetLine().GetIndex();
      unsigned long length = lit.GetLine().GetLength();
      for (unsigned long i=0; i<length; i++)
        {
        // find the corresponding label in the ms label map
        // if found : ++ in the cell [n, p]
        for (unsigned long j = currentRegionMS;
             j < (currentRegionMS + m_NumberOfRegionsMS);
             j++)
          {
          // TODO : optimize here : call GetLabelObjet(label) would be faster
          const LabelObjectType *regionMS = this->GetMachineSegmentationLabelMap()->GetNthLabelObject(j%m_NumberOfRegionsMS);
          if (regionMS->HasIndex(idx))
            {
            currentRegionMS = j%m_NumberOfRegionsMS;
            m_Matrix(currentRegionGT, currentRegionMS)++;
            break;
            }
          }
        idx[0]++;
        }
      ++lit;
      }
  }
  
  }
  #endif
  