Created by the British Broadcasting Corporation.
A class used for correcting estimates of entropy. More...
#include <common.h>
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.
| void dirac::EntropyCorrector::Init | ( | ) | [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 |
TwoDArray<float> dirac::EntropyCorrector::m_Ufctrs [private] |
TwoDArray<float> dirac::EntropyCorrector::m_Vfctrs [private] |
TwoDArray<float> dirac::EntropyCorrector::m_Yfctrs [private] |
© 2004 British Broadcasting Corporation.
Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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