| 摘要 |
A combined fingerprinting and a decoding method are provided to be able to attain the saving of the transmission bandwidth by making the effective encoding of 3D data possible and providing the same 3D file stream for all users. A combined fingerprinting and a decoding method includes the steps of: A-1) producing the polygon set of objects(Polygon Object Set, "POS") which is arranged to the one-dimension; A-2) producing the POS map it arranges to two dimension increased each polygon set of objects(POS) belonging to the sub category; A-3) sampling data applied from each row of the POS map to encoding; A-4) ciphering the core feature(Core Feature, "CF") with the symmetric cryptosystem key(symmetry encryption key, KS) and the basic feature(Basic Feature, "BF") with the group encryption key(group encryption key, KG) performing the encoding about sampled data through the encryption algorithm; A-5) transmitting this to a plurality of users after producing 3D data file stream encrypted with part assembling the additional information of above statement step A-1) and the geometry information encrypted with part obtained in above statement step A-4. |
