Method and apparatus for inverse quantization of mpeg-4 video

H - Electricity – 04 – N

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H04N 7/50 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2329725

Inverse quantization (36, 44, 60) of a two-dimensional array of video coefficients QF[v][u] is provided. A first weighting matrix <o>W</o>[0][v][u]=2*W[0][v][u] for intra-coded macroblocks and a second weighting matrix <o>W</o>[1][v][u]=2*W[1][v][u] for non-intra-coded macroblocks are pre-computed and stored (88). A quantization difference (quanti+1) to be used in selecting a weight factor is computed (70) based on a current macroblock quantization level. The weight factor is output from one of the weighting matrices in response to the quantization difference and a macroblock type identifier (66) (i.e., intra-coded or non-intra-coded). Subsequent weights Wi+1[w][v][u] are then computed (86) from a current weight Wi[w][v][u] and the weight factor. The array of coefficients QF[v][u] is multiplied (92) by the weights Wi+1[w][v][u] to reconstruct unquantized coefficients.

L'invention concerne la quantification inverse (36, 44, 60) d'un groupement bidimensionnel de coefficients vidéo QF[v][u]. On précalcule et on enregistre (88) une première matrice de pondération <O>W</O>[0][v][u]=2*W[0][v][u] pour les macroblocs à intracodage et une seconde matrice de pondération <O>W</O>[1][v][u]=2*W[1][v][u] pour les macroblocs sans intracodage. On calcule (70) une différence de quantification (quant¿i+1?) destinée à être utilisée pour la sélection d'un facteur de pondération, sur la base d'un niveau existant de quantification de macrobloc. Le facteur de pondération est extrait de l'une des matrices de pondération en fonction de la différence de quantification et d'après un identificateur de type de macrobloc (66) (c'est-à-dire avec ou sans intracodage). On calcule (86) ensuite d'autres pondérations W¿i+1?[w][v][u] à partir d'une pondération existante W¿i?[w][v][u] et à partir du facteur de pondération. On multiplie (92) le groupement de coefficients QF[v][u] par les pondérations W¿i+1?[w][v][u] de manière à reconstruire des coefficients sans quantification.

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