/*
//
//  Copyright 2016 Google, Inc.
//
//  Copyright 1997-2009 Torsten Rohlfing
//
//  Copyright 2004-2011 SRI International
//
//  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/>.
//
//  $Revision$
//
//  $LastChangedDate$
//
//  $LastChangedBy$
//
*/

#ifndef __cmtkFilterVolume_h_included_
#define __cmtkFilterVolume_h_included_

#include <list>

#include <cmtkconfig.h>

#include <Base/cmtkUniformVolume.h>
#include <Base/cmtkTypedArray.h>
#include <Base/cmtkUnits.h>

namespace
cmtk
{

/** \addtogroup Base */
//@{

/// Class for filtering volume images.
class FilterVolume
{
public:
  /** Apply Gaussian filter.
   *\param volume Input 3D image.
   *\param width Width (standard deviation) of the Gaussian kernel.
   *\param radius Filter radius in multiples of the filter width. Outside the
   * radius (Euclidean distance) the filter is truncated.
   *\param maskData Optional binary mask data array.
   *\return A newly allocated TypedArray object that can be used, for 
   * example, to replace the one held by the input image. The data type of the
   * array is identical to the input array.
   */
  static TypedArray::SmartPtr GaussianFilter( const UniformVolume* volume, const Units::GaussianSigma& width, const Types::Coordinate radius = 1.0, const TypedArray* maskData = NULL );

  /** Apply Coupe denoising filter.
   *\param volume Input 3D image.
   *\param beta Smoothing adjustment parameter
   *\param windowRadius Distance from center voxel to outer edge of window 
   *\return A newly allocated TypedArray object that can be used, for 
   * example, to replace the one held by the input image. The data type of the
   * array is identical to the input array.
   */
  static TypedArray::SmartPtr CoupeFilter
  ( const UniformVolume* volume, 
    const int windowRadius,
    const float beta = 0.5 );

  /** Apply Torsten Rohlfing's single-image intensity-consistent Gaussian filter.
   *\param volume Input 3D image.
   *\param subjectData Pixel array of the individual grey image from this 
   * subject.
   *\param maskData Optional binary mask data array.
   *\param iFilterSigma Width (standard deviation of the Gaussian kernel.
   *\param filterWidth Width (standard deviation of the Gaussian kernel.
   *\param filterRadius Filter radius in multiples of the filter width. 
   * Outside the radius (Euclidean distance) the filter is truncated.
   *\return A newly allocated TypedArray object that can be used, for 
   * example, to replace the one held by the input image. The data type of the
   * array is identical to the input array.
   */
  static TypedArray::SmartPtr RohlfingFilter
  ( const UniformVolume* volume, const TypedArray* subjectData,
    const TypedArray* maskData, const Units::GaussianSigma& iFilterSigma,
    const Units::GaussianSigma& filterWidth, const Types::Coordinate filterRadius );
  
  /** Apply Colin Studholme's Gaussian filter with registration-based weights.
   *\param volume Input 3D image.
   *\param subjectData Pixel array of the individual grey image from this 
   * subject.
   *\param averageData Pixel array of the population average grey image.
   *\param maskData Optional binary mask data array.
   *\param imgList List of pixel arrays from matched 3D images. The consistency
   * between these pixel arrays determines the relative weights of the
   * otherwise Gaussian kernel. Consult Colin's NeuroImage (2003) paper for
   * details.
   *\param binWidth Bin width of the intensity histogram used to quantify the
   * matching between all individuals.
   *\param filterWidth Width (standard deviation of the Gaussian kernel.
   *\param filterRadius Filter radius in multiples of the filter width. 
   * Outside the radius (Euclidean distance) the filter is truncated.
   *\return A newly allocated TypedArray object that can be used, for 
   * example, to replace the one held by the input image. The data type of the
   * array is identical to the input array.
   */
  static TypedArray::SmartPtr StudholmeFilter
  ( const UniformVolume* volume, const TypedArray* subjectData,
    const TypedArray* averageData, const TypedArray* maskData,
    std::list<TypedArray::SmartPtr> imgList, const Types::DataItem binWidth,
    const Units::GaussianSigma& filterWidth, const Types::Coordinate filterRadius );

  /** Apply Colin Studholme's Gaussian filter using multiple time points.
   *\param volume Input 3D image.
   *\param subjectData List of pixel arrays of the individual grey images from
   * this subject. Each list item corresponds to one time point. Ideally, there
   * are two items in the list, which correspond to the time points between
   * which the Jacobian map in "volume" was computed.
   *\param averageData Pixel array of the population average grey image.
   *\param maskData Optional binary mask data array.
   *\param imgList List of pixel arrays from matched 3D images. The consistency
   * between these pixel arrays determines the relative weights of the
   * otherwise Gaussian kernel. Consult Colin's NeuroImage (2003) paper for
   * details.
   *\param binWidth Bin width of the intensity histogram used to quantify the
   * matching between all individuals.
   *\param filterWidth Width (standard deviation of the Gaussian kernel.
   *\param filterRadius Filter radius in multiples of the filter width. 
   * Outside the radius (Euclidean distance) the filter is truncated.
   *\return A newly allocated TypedArray object that can be used, for 
   * example, to replace the one held by the input image. The data type of the
   * array is identical to the input array.
   */
  static TypedArray::SmartPtr StudholmeFilter
  ( const UniformVolume* volume, 
    std::list<TypedArray::SmartPtr> subjectData,
    const TypedArray* averageData, const TypedArray* maskData,
    std::list<TypedArray::SmartPtr> imgList, const Types::DataItem binWidth,
    const Units::GaussianSigma& filterWidth, const Types::Coordinate filterRadius );
};

//@}

} // namespace cmtk

#endif // #ifndef __cmtkFilterVolume_h_included_
