Created by the British Broadcasting Corporation.
A class used for correcting estimates of entropy. More...
#include <common.h>
Public Member Functions | |
EntropyCorrector (int depth) | |
Constructor. | |
float | Factor (const int bandnum, const PictureParams &pp, const CompSort c) const |
Returns the correction factor. | |
void | Update (int bandnum, const PictureParams &pp, CompSort c, int est_bits, int actual_bits) |
Update the correction factors. |
Private Member Functions | |
void | Init () |
Initialises the correction factors. |
Private Attributes | |
TwoDArray< float > | m_Yfctrs |
TwoDArray< float > | m_Ufctrs |
TwoDArray< float > | m_Vfctrs |
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.
dirac::EntropyCorrector::EntropyCorrector | ( | int | depth | ) |
Constructs arrays of correction factors of size.
depth | the depth of the wavelet transform. |
float dirac::EntropyCorrector::Factor | ( | const int | bandnum, |
const PictureParams & | pp, | ||
const CompSort | c | ||
) | const |
Returns the correction factor for the band given also the type of picture and component.
|
private |
void dirac::EntropyCorrector::Update | ( | int | bandnum, |
const PictureParams & | pp, | ||
CompSort | c, | ||
int | est_bits, | ||
int | actual_bits | ||
) |
Update the factors for a given subband, component and picture type.
bandnum | the number of the subband to update |
pp | picture parameters |
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 |
|
private |
|
private |
|
private |
© 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.