France Telecom

Loïc Bouget

Patrick Gioia

Christian Bouville

Isabelle Marchal

Non-adjacent rows (i) in the visibility matrix (Msr) that have a large number of common elements are automatically detected (E) and any such detected rows are permutated to put the lines detected as having a large number of common elements into sequence to form a modified visibility matrix (M'sr), and digital image coding is applied (E) to the Boolean elements of the modified visibility matrix (M&#x2032;sr).

Visibility data compression/decompression method, compression system and decoder

A method is provided for decoding a data stream representing an object with at least three dimensions, associated with a basic mesh including of an assembly of facets defined by an assembly of vertices and ridges, and with wavelet coefficients corresponding to the local modifications of the basic mesh, indexed each by a vertex of the basic mesh. For at least some wavelet coefficients of the data stream, the method includes the following steps: determining an orientation of an edge bearing the vertex indexing the wavelet coefficients, called an orientation of the wavelet coefficient; and determining, based on the orientation, information for locating in the basic mesh at least one child of the wavelet coefficient, distinct locating rules being associated with each orientation, so as to extract a data stream of at least some of the wavelet coefficients, associated each with locating information.

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Rennes, France

Loïc Bouget