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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2010 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: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#ifndef __cmtkVolumeGridToGridLookup_h_included_
#define __cmtkVolumeGridToGridLookup_h_included_
#include <cmtkconfig.h>
#include <Base/cmtkUniformVolume.h>
namespace
cmtk
{
/** \addtogroup Base */
//@{
/** Class for grid to grid lookup tables.
* This class is only for internal use by the Resmple function(s) of
* the UniformVolume class. The lookup table basically records for
* each pixel in the target grid, which pixels in the source grid it
* depends on, and with what relative weight each source pixel contributes
* to the target pixel. The contributions are computed as relative overlaps
* of boxcar-shaped pixel profiles.
*/
class VolumeGridToGridLookup
{
public:
/// Constructor: takes original and new image grids.
VolumeGridToGridLookup( const UniformVolume& fromGrid, const UniformVolume& toGrid );
/// Get number of source pixels that contribute to the given target pixel.
int GetSourceCount( const int dim, const int idx ) const
{
return this->m_SourceCount[dim][idx];
}
/// Get index of first source pixel that contributes to the given target pixel.
int GetFromIndex( const int dim, const int idx ) const
{
return this->m_FromIndex[dim][idx];
}
/// Get weight with which a given source pixel contributes to the given target pixel.
Types::Coordinate GetWeight( const int dim, const int idx, const int fromIdx ) const
{
return this->m_Weight[dim][idx][fromIdx];
}
/// Length (width) of a given target pixel.
Types::Coordinate GetLength( const int dim, const int idx ) const
{
return this->m_Length[dim][idx];
}
private:
/// Array of arrays of numbers of source pixels that contribute to the given target pixel.
std::vector< std::vector< int > > m_SourceCount;
/// Array of arrays of first source pixels that contributes to the given target pixels.
std::vector< std::vector< int > > m_FromIndex;
/// Array of arrays of weight arrays.
std::vector< std::vector< std::vector<Types::Coordinate> > > m_Weight;
/// Array of array of target pixel lengths.
std::vector< std::vector< Types::Coordinate > > m_Length;
};
//@}
} // namespace cmtk
#endif // #define __cmtkUniformVolume_h_included_
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