Adaptive predictive encoding
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsErik Norvell, Fredrik Jansson
Life of this patent
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Abstract
A method performed in an encoder for selecting a coding mode for a current frame includes obtaining bit rates for absolute coding and predictive coding. The method includes calculating a bit rate difference based on the bit rates obtained. The method includes low-pass filtering the bit rate difference. The method includes selecting a coding mode based on the bit rate difference, the low-pass filtered bit rate difference, and a predictive mode counter.
Claims24
A method performed in an encoder for selecting a coding mode for a current frame, the method comprising:
- obtaining bit rates for absolute coding and predictive coding;
- calculating a bit rate difference based on the bit rates for absolute coding and predictive coding;
- low-pass filtering the bit rate difference according to bitdiffLP (m)=γbitdiff(m)+(1-γ) bitdiffLP(m−1), where γ is a low-pass filter coefficient;
- and
- selecting a coding mode based on the bit rate difference, the low-pass filtered bit rate difference, and a predictive mode counter.
An encoder for selecting a coding mode for a current frame, the encoder adapted to perform operations comprising:
- obtaining bit rates for absolute coding and predictive coding;
- calculating a bit rate difference based on the bit rates for absolute coding and predictive coding;
- low-pass filtering the bit rate difference according to bitdiffLP(m)=γbitdiff(m)+(1−γ) bitdiffLP(m−1), where γ is a low-pass filter coefficient;
- and
- selecting a coding mode based on the bit rate difference, the low-pass filtered bit rate difference, and a predictive mode counter.
Dependencies are inferred from the claim text.