Flexible quantization

Details Flexible quantization Flexible quantization

H - Electricity

04

N

H04N 7/24 (2006.01)

Patent

CA 2647332

A digital media encoder/decoder uses a flexible quantization technique that provides the ability to vary quantization along various dimensions of the encoded digital media data, including spatial, frequency sub bands and color channels. The codec utilizes a signaling scheme to signal various permutations of flexible quantization combinations efficiently for primary usage scenarios. When a choice of quantizer is available, the codec efficiently encodes the current quantizer by defining a subset of quantizers and indexes the current quantizer from the set.

Selon l'invention, un codeur/décodeur multimédia numérique utilise une technique de quantification flexible qui permet de faire varier la quantification avec diverses dimensions des données multimédia numériques codées, y compris des sous-bandes de fréquence, spatiales et des canaux de couleurs. Le codex utilise un schéma de signalisation afin de signaler efficacement diverses permutations des combinaisons de quantification flexible pour des scénarios d'utilisation primaires. Lorsqu'un choix d'un quantificateur est disponible, le codec code efficacement le quantificateur actuel par définition d'un sous-ensemble de quantificateurs et indexe ce quantificateur à partir dudit ensemble.

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