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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis 
 * Copyright (c) Leipzig, Madrid 1999-2014 Gert Wollny
 *
 * MIA 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.
 *
 * This program 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 MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef mia_internal_similarity_profile_hh
#define mia_internal_similarity_profile_hh

#include <mia/core/fft1d_r2c.hh>
#include <mia/core/import_handler.hh>

NS_MIA_BEGIN
/**
   @ingroup perf 
   \brief A class to evaluate image similarity profiles of image series 
   \tparam dim the dimenstion of the image data to be used 

   This class evaluates the similarity profile of a series of images 
   with respect to a certain cost function and a given reference. 
   It can then be used to evaluate a periodic subset and the 
   highest frequency coefficient. 
*/
template <int dim>
class EXPORT_HANDLER TSimilarityProfile {
public: 
        /// the trait to handle dimension based typedefs 
	typedef dimension_traits<dim> this_dim_trait; 
	
	/// Pointer type for cost measure used to create the similarity profile 
	typedef typename this_dim_trait::PFullCost PFullCost; 

	/// type of the image series to create the similarity profile from 
	typedef typename this_dim_trait::ImageSeries ImageSeries; 

	/// pointer type for the actual images 
	typedef typename this_dim_trait::PImage PImage; 
	/**
	   Contruct and prepare the similarity profile. Throws an std::invalid_argument exception 
	   on failure. 
	   \param cost image similarity to evaluate the similarity series 
	   \param images the image series 
	   \param reference the reference to use for evaluating the similarity series 
	   \param max_delta  the maximum temporal delta for the subset 
	 */
	TSimilarityProfile(PFullCost cost, const ImageSeries& images, 
			   size_t reference, size_t max_delta); 
	
	/// copy constructor 
	TSimilarityProfile(const TSimilarityProfile<dim>& org); 
	
	/// assignment operator 
	TSimilarityProfile<dim>& operator = (const TSimilarityProfile<dim>& org); 

	
	/// \returns the peak frequency coefficent and its index
	float get_peak_frequency() const;

	/// @returns a periodic subset including the first and last image of the series
	std::vector<size_t> get_periodic_subset() const; 
private: 
	size_t m_skip; 
	mutable float m_peak_freq;
	mutable bool m_peak_freq_valid; 
	size_t m_reference; 
	size_t m_max_delta; 
	std::vector<CFFT1D_R2C::Real> m_cost_values; 
}; 

NS_MIA_END

#endif