# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

# pixel_match.h

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    00001 /* ***** BEGIN LICENSE BLOCK *****
    00002 *
    00003 * $Id: pixel_match.h,v 1.4 2007/03/19 16:19:00 asuraparaju Exp $ $Name: Dirac_0_7_0 $
    00004 *
    00005 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
    00006 *
    00007 * The contents of this file are subject to the Mozilla Public License
    00008 * Version 1.1 (the "License"); you may not use this file except in compliance
    00009 * with the License. You may obtain a copy of the License at
    00010 * http://www.mozilla.org/MPL/
    00011 *
    00012 * Software distributed under the License is distributed on an "AS IS" basis,
    00013 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
    00014 * the specific language governing rights and limitations under the License.
    00015 *
    00016 * The Original Code is BBC Research and Development code.
    00017 *
    00018 * The Initial Developer of the Original Code is the British Broadcasting
    00019 * Corporation.
    00020 * Portions created by the Initial Developer are Copyright (C) 2004.
    00021 * All Rights Reserved.
    00022 *
    00023 * Contributor(s): Thomas Davies (Original Author)
    00024 *
    00025 * Alternatively, the contents of this file may be used under the terms of
    00026 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
    00027 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
    00028 * the GPL or the LGPL are applicable instead of those above. If you wish to
    00029 * allow use of your version of this file only under the terms of the either
    00030 * the GPL or LGPL and not to allow others to use your version of this file
    00031 * under the MPL, indicate your decision by deleting the provisions above
    00032 * and replace them with the notice and other provisions required by the GPL
    00033 * or LGPL. If you do not delete the provisions above, a recipient may use
    00034 * your version of this file under the terms of any one of the MPL, the GPL
    00035 * or the LGPL.
    00036 * ***** END LICENSE BLOCK ***** */
    00037
    00038 #ifndef _PIXEL_MATCH_H_
    00039 #define _PIXEL_MATCH_H_
    00040
    00041 /* *************************************************************************
    00042 *
    00043 * Class for getting motion vectors to pixel-accuracy
    00044 *
    00045 * The class could be implemented in any number of ways. The approach taken
    00046 * has been to do hierarchical matching, which means doing block matching
    00047 * on smaller, downcoverted versions of the pictures in order to get a wider
    00048 * effective search range. At each level of searching the vectors discovered
    00049 * can be used as guides to the next level of searching, and in this way
    00050 * large motions can be detected easily. The danger is that the motions of
    00051 * small objects can be overlooked.
    00052 *
    00053 * *************************************************************************/
    00054
    00055 #include <libdirac_common/common.h>
    00056 #include <libdirac_common/motion.h>
    00057 #include <libdirac_motionest/block_match.h>
    00058 namespace dirac
    00059 {
    00060     class FrameBuffer;
    00061     class MvData;
    00062     class EncoderParams;
    00063     class PicArray;
    00064
    00065
    00066     class PixelMatcher
    00067     {
    00068     public:
    00069
    00071         PixelMatcher( const EncoderParams& encp);
    00072
    00074         /* Do the searching.
    00075
    00076         \param  my_buffer  the buffer of pictures from which frames are taken
    00077         \param  frame_num  the number of the frame for which motion is to be estimated
    00078         \param  mv_data    class in which the measured motion vectors are stored, together with costs
    00079
    00080         */
    00081         void DoSearch(const FrameBuffer& my_buffer,
    00082                       int frame_num,
    00083                       MEData& me_data);
    00084
    00085     private:
    00086
    00087         // Member variables
    00088
    00090         const EncoderParams& m_encparams;
    00091
    00092         // the depth of the hierarchical match
    00093         int m_depth;
    00094
    00095         // the level we're at (from 0 to depth)
    00096         int m_level;
    00097
    00098         // the search-range sizes for the hierarchical match
    00099         int m_xr, m_yr;
    00100
    00101         // the frame sort - I, L1 or L2
    00102         FrameSort m_fsort;
    00103
    00104         // list of candidate vectors for checking
    00105         CandidateList m_cand_list;
    00106
    00107         // Lagrangian lambda used for matching
    00108         float m_lambda;
    00109
    00110         // Prediction used for each block. This is derived from neighbouring blocks
    00111         // and is used to control the variation in the motion vector field.
    00112         MVector m_mv_prediction;
    00113
    00114     private:
    00115
    00116         // Functions
    00117
    00119         void MakePicHierarchy(const PicArray& data, OneDArray< PicArray* >& down_data);
    00120
    00122         void MakeMEDataHierarchy(const OneDArray< PicArray*>& down_data,
    00123                                            OneDArray< MEData* >& me_data_set );
    00124
    00126         void TidyPics( OneDArray< PicArray*>& down_data );
    00127
    00129         void TidyMEData( OneDArray< MEData*>& me_data_set );
    00130
    00132         void MatchPic(const PicArray& ref_data , const PicArray& pic_data , MEData& me_data ,
    00133                       const MvData& guide_data, const int ref_id);
    00134
    00136         void DoBlock(const int xpos, const int ypos ,
    00137                      const MvArray& guide_array,
    00138                      BlockMatcher& block_match);
    00139
    00140     };
    00141
    00142 } // namespace dirac
    00143
    00144 #endif

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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