Wavelet-based mesh coding method

G - Physics – 06 – T

Patent

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G06T 9/00 (2006.01) G06T 17/20 (2006.01)

Patent

CA 2429259

The invention concerns a method for coding a source mesh (M) representing a three-dimensional object or scene, using a simple mesh (M0) having a reduced number of facets defined each by vertices and edges, and coefficients in a wavelet base, corresponding to local modifications of said simple mesh (M0), and enabling to determine each time a parametering function of the mesh. The invention is characterised in that said method comprises a step which consists in eliminating the effect of at least a wavelet coefficient (d; d1, , dn) verifying at least one criterion of non-essentiality, so as to provide a partial mesh (M'), corresponding to a partial representation of said source mesh (M).

L'invention concerne un procédé de codage d'un maillage source (M) représentatif d'un objet ou d'une scène en trois dimensions, mettant en oeuvre unmaillage simple (M0) présentant un nombre réduit de facettes définies chacune par des sommets et des arêtes, et des coefficients dans une base d'ondelettes, correspondant à des modifications locales dudit maillage simple (M0), et permettant de déterminer à chaque instant une fonction de paramétrisation du maillage. Selon l'invention, un tel procédé comprend une étape de suppression de l'effet d'au moins un coefficient d'ondelette (d ; d1,..., dn) vérifiant au moins un critère de non-essentialité, de façon à fournir un maillage partiel (M'), correspondant à une représentation partielle dudit maillage source (M).

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