resample.h

/*
 * Copyright (c) 2008-2016 the MRtrix3 contributors
 * 
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/
 * 
 * MRtrix 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.
 * 
 * For more details, see www.mrtrix.org
 * 
 */

#ifndef __dwi_tractography_resample_h__
#define __dwi_tractography_resample_h__


#include <vector>

#include "dwi/tractography/tracking/generated_track.h"


namespace MR {
  namespace DWI {
    namespace Tractography {


        class Upsampler
        {

          public:
            Upsampler () :
              data (4, 3) { }

            Upsampler (const size_t os_ratio) :
              data (4, 3) {
                set_ratio (os_ratio);
              }

            Upsampler (const Upsampler& that) :
              M    (that.M),
              temp (M.rows(), 3),
              data (4, 3) { }

            ~Upsampler() { }


            void set_ratio (const size_t);
            bool operator() (std::vector<Eigen::Vector3f>&) const;

            size_t get_ratio() const { return (M.rows() ? (M.rows() + 1) : 1); }
            bool   valid ()    const { return (M.rows()); }


          private:
            Eigen::MatrixXf M;
            mutable Eigen::MatrixXf temp, data;

            bool interp_prepare (std::vector<Eigen::Vector3f>&) const;
            void increment (const Eigen::Vector3f&) const;

        };



      class Downsampler
      {

        public:
          Downsampler () : ratio (1) { }
          Downsampler (const size_t downsample_ratio) : ratio (downsample_ratio) { }

          bool operator() (Tracking::GeneratedTrack&) const;
          bool operator() (std::vector<Eigen::Vector3f>&) const;

          bool valid() const { return (ratio > 1); }
          size_t get_ratio() const { return ratio; }
          void set_ratio (const size_t i) { ratio = i; }

        private:
          size_t ratio;

      };



      class Resampler
      {

        public:
          Resampler () :
              step_size (0.0) { }

          Resampler (const float ss) :
              step_size (ss) { }

          void set_step_size (const float ss) { step_size = ss; }
          float get_step_size() const { return step_size; }
          bool valid() const { return step_size; }

          bool operator() (std::vector<Eigen::Vector3f>&) const;

        private:
          float step_size;

      };





    }
  }
}

#endif