Digital signal compression encoding with improved quantisation

Details Digital signal compression encoding with improved quantisation Digital signal compression encoding with improved quantisation

H - Electricity

04

N

H04N 7/30 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2280819

In compression encoding of a digital signal, such as MPEG2, transform coefficients are quantised with the lower bound of each interval being controlled by a parameter .lambda.. In the MPEG2 reference coder, for example, .lambda.=0.75. Because the quantised coefficients are variable length coded, improved quality or reduced bit rates can be achieved by controlling .lambda. so as to vary dynamically the bound of each interval with respect to the associated representation level. The parameter .lambda. can vary with coefficient amplitude, with frequency, with quantisation step size. In a transcoding operation, .lambda. can also vary with parameters in the initial coding operation.

Lors du codage de compression d'un signal numérique, tel que MPEG 2, les coefficients de transformation sont quantifiés, la limite inférieure de chaque intervalle étant commandée par un paramètre .lambda.. Pour le codeur de référence MPEG 2, par exemple, .lambda. vaut 0,75. Parce que les coefficients quantifiés sont codés en longueur variable, on peut obtenir une plus grande qualité ou des débits binaires réduits en commandant .lambda., et ce, dans le but de modifier de manière dynamique la limite de chaque intervalle par rapport au niveau de représentation associé. Le paramètre .lambda. peut varier en fonction de l'amplitude du coefficient, de la fréquence, du pas de progression de la quantification. Lors d'une opération de transcodage, .lambda. peut également varier en fonction des paramètres de l'opération de codage initiale.

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