Dirac - A Video Codec

Created by the British Broadcasting Corporation.


pixel_match.h

Go to the documentation of this file.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: pixel_match.h,v 1.1 2004/08/03 09:23:01 asuraparaju Exp $ $Name: Dirac_0_4_3 $ 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 class FrameBuffer; 00056 class MvData; 00057 class EncoderParams; 00058 class PicArray; 00059 00060 #include <libdirac_common/common.h> 00061 #include <libdirac_common/motion.h> 00062 #include <libdirac_motionest/block_match.h> 00063 00064 class PixelMatcher 00065 { 00066 public: 00067 00069 PixelMatcher( const EncoderParams& encp); 00070 00072 /* Do the searching. 00073 00074 \param my_buffer the buffer of pictures from which frames are taken 00075 \param frame_num the number of the frame for which motion is to be estimated 00076 \param mv_data class in which the measured motion vectors are stored, together with costs 00077 00078 */ 00079 void DoSearch(const FrameBuffer& my_buffer, 00080 int frame_num, 00081 MEData& me_data); 00082 00083 private: 00084 00085 // Member variables 00086 00088 const EncoderParams& m_encparams; 00089 00090 // the depth of the hierarchical match 00091 int m_depth; 00092 00093 // the level we're at (from 0 to depth) 00094 int m_level; 00095 00096 // the search-range sizes for the hierarchical match 00097 int m_xr, m_yr; 00098 00099 // the frame sort - I, L1 or L2 00100 FrameSort m_fsort; 00101 00102 // list of candidate vectors for checking 00103 CandidateList m_cand_list; 00104 00105 // Lagrangian lambda used for matching 00106 float m_lambda; 00107 00108 // Prediction used for each block. This is derived from neighbouring blocks 00109 // and is used to control the variation in the motion vector field. 00110 MVector m_mv_prediction; 00111 00112 // Functions 00113 00115 void MakePicHierarchy(const PicArray& data, OneDArray< PicArray* >& down_data); 00116 00118 void MakeMEDataHierarchy(const OneDArray< PicArray*>& down_data, 00119 OneDArray< MEData* >& me_data_set ); 00120 00122 void TidyPics( OneDArray< PicArray*>& down_data ); 00123 00125 void TidyMEData( OneDArray< MEData*>& me_data_set ); 00126 00128 void MatchPic(const PicArray& ref_data , const PicArray& pic_data , MEData& me_data , 00129 const MvData& guide_data, int ref_id); 00130 00132 void DoBlock(int xpos, int ypos , 00133 TwoDArray<MvCostData>& pred_costs, 00134 MvArray& mv_array, 00135 const MvArray& guide_array, 00136 BlockMatcher& block_match); 00137 00138 }; 00139 00140 #endif

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
HTML documentation generated by Dimitri van Heesch's excellent Doxygen tool.