Rate-distortion quantization for context-adaptive variable...

H - Electricity – 04 – N

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H04N 7/26 (2006.01)

Patent

CA 2720697

In general, this disclosure provides techniques for quantization of the coefficients of video blocks in a manner that can achieve a desirable balance of rate and distortion. The described techniques may analyze a plurality of quantization levels associated with each individual coefficient to select the quantization level for the individual coefficients that results in a lowest coding cost. Since CAVLC does not encode each coefficient independently, the techniques may compute the coding costs for each of the candidate quantization levels associated with the individual coefficients based on quantization levels selected for previously quantized coefficients and estimated (or predicted) quantization levels for subsequent coefficients of a coefficient vector. The quantization levels for each of the coefficients are selected based on computed coding costs to obtain a set of quantized coefficients that minimize a rate-distortion model.

La présente invention concerne, d'une manière générale, des techniques de quantification des coefficients de blocs vidéo selon une manière qui peut obtenir un équilibre souhaitable de la vitesse et de la distorsion. Les techniques décrites peuvent analyser une pluralité de niveaux de quantification associés à chaque coefficient individuel pour sélectionner le niveau de quantification pour les coefficients individuels, ce qui a pour résultat un coût de codage moindre. Puisque le codage CAVLC ne code pas de manière indépendante chaque coefficient, les techniques peuvent calculer les coûts de codage pour chacun des niveaux de quantification potentiels associés aux coefficients individuels sur la base des niveaux de quantification sélectionnés pour des coefficients quantifiés auparavant et des niveaux de quantifications estimés (ou prédits) pour les coefficients suivants d'un vecteur de coefficient. Les niveaux de quantification pour chacun des coefficients sont sélectionnés sur la base des coûts de codage calculés pour obtenir une série de coefficients quantifiés qui réduisent au minimum un modèle vitesse - distorsion.

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