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/*
//
// Copyright 2004-2010 SRI International
//
// Copyright 1997-2009 Torsten Rohlfing
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#include "cmtkTypedArrayFunctionHistogramEqualization.h"
#include <vector>
#include <algorithm>
cmtk::TypedArrayFunctionHistogramEqualization
::TypedArrayFunctionHistogramEqualization
( const TypedArray& variableArray, const size_t numberOfHistogramBins )
{
this->m_Histogram = Histogram<unsigned int>::SmartPtr( variableArray.GetHistogram( numberOfHistogramBins ) );
(*this->m_Histogram)[0] = 0; // this effectively stretches the distribution
this->m_Histogram->ConvertToCumulative();
const Types::DataItemRange range = variableArray.GetRange();
this->m_MinValue = range.m_LowerBound;
this->m_ScaleFactor = 1.0 * range.Width() / (*this->m_Histogram)[numberOfHistogramBins-1];
}
cmtk::Types::DataItem
cmtk::TypedArrayFunctionHistogramEqualization
::operator()( const cmtk::Types::DataItem valueIn ) const
{
return this->m_MinValue + this->m_ScaleFactor * (*this->m_Histogram)[ this->m_Histogram->ValueToBin( valueIn ) ];
}
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