dirac::EntropyCorrector

dirac::EntropyCorrector Class Reference

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

#include <common.h>

List of all members.

Public Member Functions

 EntropyCorrector (int depth)
 Constructor.
float Factor (const int bandnum, const FrameSort fsort, const CompSort c) const
 Returns the correction factor.
void Update (int bandnum, FrameSort fsort, CompSort c, int est_bits, int actual_bits)
 Update the correction factors.

Detailed Description

A class used for correcting estimates of entropy.

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.

Definition at line 233 of file common.h.

Constructor & Destructor Documentation

EntropyCorrector::EntropyCorrector (  int  depth  ) 
 

Constructor.

Constructs arrays of correction factors of size.

Parameters:
depth the depth of the wavelet transform.

Definition at line 68 of file common.cpp.

Member Function Documentation

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

Returns the correction factor.

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

Definition at line 76 of file common.cpp.

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

Update the correction factors.

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

Definition at line 133 of file common.cpp.

Referenced by dirac::CompCompressor::Compress().

The documentation for this class was generated from the following files:
Generated on Tue Dec 13 14:49:20 2005 for guliverkli by  doxygen 1.4.5