Method and apparatus for model compression

1. A method for compressing a mesh model having geometry information and connectivity information of vertices, comprising:

defining a first set of vertices all having a same valence;

determining a subset of the first set of vertices that are encompassed by an area defined by the first set of vertices;

encoding the mesh model by a processor without the connectivity information for the subset of the first set of vertices; and

encoding the mesh model with the connectivity information for a second set of vertices, the second set comprising (1) a first group including all vertices having different valence from the first set of vertices and (2) a second group including boundary vertices having the same valence of the first set of vertices.

2. The method according to claim 1 , wherein defining the first set of vertices having the same valence further comprises:

defining the first set of vertices having a dominant valence.

3. The method according to claim 1 , wherein defining the first set of vertices having the same valence further comprises:

defining the first set of vertices having a regular valence.

4. The method according to claim 1 , wherein the mesh model is a triangular mesh model and the connectivity information comprises triangles formed by vertices.

5. The method according to claim 4 , wherein encoding the mesh model further comprises:

encoding the subset of the first set of vertices with an order, the order systematically traversing triangles of the area.

6. The method according to claim 5 , further comprising:

decoding the connectivity information of the subset of the first set of vertices with the order by systematically recovering the triangles of the area to satisfy valences of the vertices.

7. The method according to claim 1 , wherein the second set of vertices comprises a vertex having a different connectivity property from the first set of vertices.

8. The method according to claim 7 , wherein the vertex has a different valence from the first set of vertices.

9. The method according to claim 1 , wherein the second set is a minimal span skeleton of all the vertices having different valences from the first set of vertices.

10. The method according to claim 1 , further comprising:

encoding the second set of vertices with a connectivity compression algorithm.

11. The method according to claim 1 , further comprising:

encoding the geometry information for the vertices with a geometry compression algorithm.

12. An apparatus for compressing a mesh model having geometry information and connectivity information of vertices, comprising:

a processor configured to define a first set of vertices all having a same valence, determine a subset of the first set of vertices that are encompassed by an area defined by the first set of vertices, encode the mesh model without the connectivity information for the subset of the first set of vertices, and encode the mesh model with the connectivity information for a second set of vertices, the second set comprising (1) a first group including all vertices having different valence from the first set of vertices and (2) a second group including boundary vertices having the same valence of the first set of vertices.

13. The apparatus according to claim 12 , further comprising:

a storage unit configured to store the encoded mesh model.

14. The apparatus according to claim 12 , further comprising:

a communication interface configured to transmit the encoded mesh model via a communication channel.

15. The apparatus according to claim 12 , further comprising:

a memory medium configured to store instructions causing the processor to compress the mesh model.