New methodology for adaptive vector quantisation |
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Authors: | Scargall L.D. Dlay S.S. |
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Affiliation: | Dept. of Electr. & Electron. Eng., Newcastle upon Tyne Univ.; |
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Abstract: | An image sequence coding scheme for low bit-rate video coding is presented. A new methodology is proposed for adaptive vector quantisation (AVQ), where the codebook is updated with new code-vectors. The new code-vectors replace less significant ones in the codebook, based on a novel scoring criterion that utilises a forgetting factor and codebook half-life. The proposed AVQ method gives rise to an additional performance enhancement of approximately 1 dB over frequency scoring techniques |
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