Process for coding or decoding motion vectors and coding or...

H - Electricity – 04 – N

Patent

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Details

H04N 7/28 (2006.01) G06T 9/00 (2006.01) H04N 7/32 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2578872

The invention relates to a process for the differential coding of a motion vector (MV0) associated with a macro-block (M0). This process comprises the steps: determining the components (MV0x, MV0y) of the said motion vector (MV0), determining a prediction vector, each component (Px, Py) of which is equal to the median value of the corresponding components of at least three candidate motion vectors (MV1, MV2, MV3), a candidate motion vector being a vector associated with a previously coded macro-block, subtracting the components thus obtained from the components of the vector to be coded. The invention also relates to a process for decoding motion vectors coded in the manner described above, as well as to the implementation devices. The invention applies to the field of image compression.

Procédé de codage différentiel d'un vecteur de mouvement (MV0) associé à un macrobloc (M0). Le procédé comporte les étapes suivantes : la détermination des composantes (MV0x, MV0y) du vecteur de mouvement (MV0); la détermination d'un vecteur de prédiction, dont chaque composante (Px, Py) est égale à la valeur médiane des composantes correspondantes d'au moins trois vecteurs de mouvement candidats (MV1, MV2, MV3), un vecteur de mouvement candidat étant un vecteur associé au macrobloc précédemment codé; la soustraction des composantes ainsi obtenues des composantes du vecteur à coder. L'invention concerne également un procédé de décodage des vecteurs de mouvement codés de la façon décrite ci-dessus, de même que les dispositifs de mise en ouvre. L'invention s'applique au domaine de la compression d'images.

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