H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/32 (2006.01)
Patent
CA 2656125
The invention relates to an encoding device and method, of CABAC type, for an initial stream of binary digital information intended to generate an outgoing stream to form video images, after decoding. In a known manner, the method comprises the following steps: bit-by-bit analysis of the successive series of bits of the initial binary stream so as to deduce therefrom, for each bit, an interval representing the probability of occurrence associated with this bit, this interval being defined by its size CIR and its lower bound CIL, analysis of this interval so as to ensure, if necessary, a renormalization thereof. According to the invention, the renormalization is non-iterative and for each bit of the initial stream is compliant with the appended figure in which: M is the length of the sequence S of high-order bits common to CIL and CIR, N is the integer number such that CIR.2N-1 < 0.25 <= CIR.2N, BO is the number of bits waiting to be inserted.
L'invention concerne un dispositif et un procédé d'encodage, de type CABAC, d'un flux initial d'informations numériques binaires destinées à générer un flux sortant pour former, après décodage, des images vidéo. De manière connue, le procédé comprend les étapes suivantes : analyse bit à bit des séries successives de bits du flux binaire initial pour en déduire, pour chaque bit, un intervalle représentant la probabilité d'occurrence associée à ce bit, cet intervalle étant défini par sa taille CIR et sa borne inférieure CIL, analyse de cet intervalle pour assurer, si nécessaire, une renormalisation de celui-ci. Selon l'invention, la renormalisation est non itérative et pour chaque bit du flux initial est conforme à la figure annexée dans laquelle : M est la longueur de la séquence S des bits de poids forts communs à CIL et CIR, N est le nombre entier tel que CIR.2N-1 < 0,25 <= CIR.2N, BO est le nombre de bits en attente d'insertion.
Assistance Technique Et Etude de Materiels Electroniques
Goudreau Gage Dubuc
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