Efficient coding and decoding of transform blocks

H - Electricity – 03 – M

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H03M 7/46 (2006.01) H03M 7/40 (2006.01) H04N 7/12 (2006.01)

Patent

CA 2618788

A block transform-based digital media codec more efficiently encodes transform coefficients by jointly-coding non-zero coefficients along with succeeding runs of zero-value coefficients (Fig. 14). When a non-zero coefficient is the last in its block, a last indicator is substituted for the run value in the symbol for that coefficient (Fig. 14, item 1435). Initial non-zero coefficients are indicated in a special symbol which jointly-codes the non- zero coefficient along with initial and subsequen runs of zeroes (Fig. 14, item 1440). The codec allows for multiple coding contexts by recognizing breaks in runs of non¬ zero coefficients and coding non-zero coefficients on either side of such a break separately (Fig. 14, item 1460). The codec also reduces code table size by indicating in each symbol whether a non-zero coefficient has absolute value greate than 1 and whether runs of zeros have positive value (Fig. 14, item 1475), and separately encodes the level of the coefficients and the length of the runs outside of the symbols (Fig. 14, item 1490).

L'invention concerne un codec multimédia numérique basé sur un bloc de transformation qui code de façon plus efficace des coefficients de transformation par codage commun de coefficients non nuls avec des passages réussis de coefficients nuls. Lorsqu'un coefficient non nul est le dernier dans son bloc, un dernier indicateur est substitué pour la valeur de passage dans le symbole pour ce coefficient. Les coefficients non nuls initiaux sont indiqués dans un symbole spécial qui code ensemble le coefficient non nul avec des passages initiaux et subséquents de zéros. Le codec permet le codage multiple de contexte par reconnaissance de pose dans les passages dans les coefficients non nuls et par codage des coefficients non nuls sur l'un ou l'autre côté de cette pose de façon séparée. Le codec réduit également la dimension de la table de codage par indication dans chaque symbole si un coefficient non nul possède une valeur absolue supérieure à 1 et si les passages de zéro ont des valeurs positives, et codent de manière séparée le niveau des coefficients et la longueur des passages hors des symboles.

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