Dirac - A Video Codec

Created by the British Broadcasting Corporation.


dirac::EntropyCorrector Class Reference

A class used for correcting estimates of entropy. More...

#include <common.h>

Collaboration diagram for dirac::EntropyCorrector:

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List of all members.

Public Member Functions

Private Member Functions

Private Attributes


Detailed Description

A class used by the encoder for correcting estimates of entropy. Used for selecting quantisers in subband coefficient coding. Factors can be adjusted in the light of previous experience.


Constructor & Destructor Documentation

dirac::EntropyCorrector::EntropyCorrector int  depth  ) 
 

Constructs arrays of correction factors of size.

Parameters:
depth the depth of the wavelet transform.


Member Function Documentation

float dirac::EntropyCorrector::Factor const int  bandnum,
const FrameSort  fsort,
const CompSort  c
const
 

Returns the correction factor for the band given also the type of frame and component.

void dirac::EntropyCorrector::Init  )  [private]
 

void dirac::EntropyCorrector::Update int  bandnum,
FrameSort  fsort,
CompSort  c,
int  est_bits,
int  actual_bits
 

Update the factors for a given subband, component and frame type.

Parameters:
bandnum the number of the subband to update
fsort frame type
c component type
est_bits the number of bits it was estimated would be used
actual_bits the number of bits that actually were used


Member Data Documentation

TwoDArray<float> dirac::EntropyCorrector::m_Ufctrs [private]
 

TwoDArray<float> dirac::EntropyCorrector::m_Vfctrs [private]
 

TwoDArray<float> dirac::EntropyCorrector::m_Yfctrs [private]
 


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

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