text: /*=========================================================================
   *
   *  Copyright Insight Software Consortium
   *
   *  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.txt
   *
   *  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 itkLiThresholdCalculator_h
  #define itkLiThresholdCalculator_h
  
  #include "itkHistogramThresholdCalculator.h"
  
  namespace itk
  {
  
  /** \class LiThresholdCalculator
   * \brief Computes the Li threshold for an image. Aka intermeans
   *
   * Implements Li's Minimum Cross Entropy thresholding method
   * This implementation is based on the iterative version (Ref. 2) of the algorithm.
   * 1) Li C.H. and Lee C.K. (1993) "Minimum Cross Entropy Thresholding"
   *    Pattern Recognition, 26(4): 617-625
   * 2) Li C.H. and Tam P.K.S. (1998) "An Iterative Algorithm for Minimum
   *    Cross Entropy Thresholding"Pattern Recognition Letters, 18(8): 771-776
   * 3) Sezgin M. and Sankur B. (2004) "Survey over Image Thresholding
   *    Techniques and Quantitative Performance Evaluation" Journal of
   *    Electronic Imaging, 13(1): 146-165
   *    http://citeseer.ist.psu.edu/sezgin04survey.html
   *
   * This class is templated over the input histogram type.
   * \warning This calculator assumes that the input histogram has only one dimension.
   *
   * \author Richard Beare. Department of Medicine, Monash University,
   * Melbourne, Australia.
   * \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
   *
   * This implementation was taken from the Insight Journal paper:
   * https://hdl.handle.net/10380/3279  or
   * http://www.insight-journal.org/browse/publication/811
   *
   * \ingroup Operators
   * \ingroup ITKThresholding
   */
  template <typename THistogram, typename TOutput=double>
  class ITK_TEMPLATE_EXPORT LiThresholdCalculator : public HistogramThresholdCalculator<THistogram, TOutput>
  {
  public:
    /** Standard class typedefs. */
    typedef LiThresholdCalculator                             Self;
    typedef HistogramThresholdCalculator<THistogram, TOutput> Superclass;
    typedef SmartPointer<Self>                                Pointer;
    typedef SmartPointer<const Self>                          ConstPointer;
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(LiThresholdCalculator, HistogramThresholdCalculator);
  
    /** Type definition for the input image. */
    typedef THistogram  HistogramType;
    typedef TOutput     OutputType;
  
  protected:
    LiThresholdCalculator() {};
    virtual ~LiThresholdCalculator() {};
    void GenerateData(void) ITK_OVERRIDE;
  
  private:
    ITK_DISALLOW_COPY_AND_ASSIGN(LiThresholdCalculator);
  
  };
  
  } // end namespace itk
  
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #include "itkLiThresholdCalculator.hxx"
  #endif
  
  #endif
  