Dirac - A Video Codec

Created by the British Broadcasting Corporation.

dirac::BlockMatcher Class Reference

Class to do block matching.

#include <block_match.h>

Collaboration diagram for dirac::BlockMatcher:

[legend]List of all members.

Public Member Functions

BlockMatcher (const PicArray &ref_data, const PicArray &pic_data, const OLBParams &bparams, const MvArray &mv_array, const TwoDArray< MvCostData > &cost_array)
Constructor.
void FindBestMatch (int xpos, int ypos, const CandidateList &cand_list, const MVector &mv_prediction, float lambda)
Find the best matching vector from a list of candidates.
void FindBestMatchSubp (int xpos, int ypos, const CandidateList &cand_list, const MVector &mv_prediction, float lambda)
Find the best matching vector from a list of candidates, to sub-pixel accuracy (TBC: merge with FindBestMatch).
ValueType GetVar (const MVector &predmv, const MVector &mv) const
Get a measure of the difference between a motion vector and a prediction.
ValueType GetVarUp (const MVector &predmv, const MVector &mv) const
Get a measure of the difference between a motion vector and a prediction, to 1/8pel accuracy.

Private Attributes

const PicArray & m_pic_data
const PicArray & m_ref_data
const MvArray & m_mv_array
const TwoDArray< MvCostData > & m_cost_array
SimpleBlockDiff m_simplediff
BChkBlockDiff m_checkdiff
SimpleBlockDiffUp m_simplediffup
BChkBlockDiffUp m_checkdiffup
OLBParams m_bparams
const int m_var_max
const int m_var_max_up

Constructor & Destructor Documentation

dirac::BlockMatcher::BlockMatcher ( const PicArray & ref_data,

const PicArray & pic_data,

const OLBParams & bparams,

const MvArray & mv_array,

const TwoDArray< MvCostData > & cost_array

)

Constructor
Parameters:

ref_data the reference picture component

pic_data the picture being matched

bparams the (overlapped) block parameters to be used for the matching

mv_array the array of vectors we're going to write into

cost_array the array of costs we're going to write into

Member Function Documentation

void dirac::BlockMatcher::FindBestMatch ( int xpos,

int ypos,

const CandidateList & cand_list,

const MVector & mv_prediction,

float lambda

)

Find the best matching vector from a list of candidates.
Parameters:

xpos the horizontal location of the block being matched

ypos the vertical location of the block being matched

cand_list the list of candidate vectors

mv_prediction the prediction for the motion vector

lambda the Lagrangian parameter

void dirac::BlockMatcher::FindBestMatchSubp ( int xpos,

int ypos,

const CandidateList & cand_list,

const MVector & mv_prediction,

float lambda

)

Find the best matching vector from a list of candidates.
Parameters:

xpos the horizontal location of the block being matched

ypos the vertical location of the block being matched

cand_list the list of candidate vectors

mv_prediction the prediction for the motion vector

lambda the Lagrangian parameter

ValueType dirac::BlockMatcher::GetVar ( const MVector & predmv,

const MVector & mv

) const

Get a measure of the difference between a motion vector and a prediction
Parameters:

predmv the predicting motion vector

mv the motion vector

ValueType dirac::BlockMatcher::GetVarUp ( const MVector & predmv,

const MVector & mv

) const

Get a measure of the difference between a motion vector and a prediction, to 1/8pel accuracy
Parameters:

predmv the predicting motion vector

mv the motion vector

Member Data Documentation

OLBParams dirac::BlockMatcher::m_bparams [private]

BChkBlockDiff dirac::BlockMatcher::m_checkdiff [private]

BChkBlockDiffUp dirac::BlockMatcher::m_checkdiffup [private]

const TwoDArray< MvCostData >& dirac::BlockMatcher::m_cost_array [private]

const MvArray& dirac::BlockMatcher::m_mv_array [private]

const PicArray& dirac::BlockMatcher::m_pic_data [private]

const PicArray& dirac::BlockMatcher::m_ref_data [private]

SimpleBlockDiff dirac::BlockMatcher::m_simplediff [private]

SimpleBlockDiffUp dirac::BlockMatcher::m_simplediffup [private]

const int dirac::BlockMatcher::m_var_max [private]

const int dirac::BlockMatcher::m_var_max_up [private]

The documentation for this class was generated from the following file:

block_match.h

© 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.