Abstract
The data exchange through network is required for widely using 3D geometric data so that geometry compression is very important for the geometric data transferring. This paper proposes a new efficient compression method for NURBS surfaces. In our method, a NURBS surface is encoded using its boundary curves and two types of difference data. The differences are represented using distances only, or distances and orientations according to the accuracy needed by receivers. The boundary curves and the differences are compressed using Discrete Cosine Transform (DCT). Types of difference data and DCT parameters can control the tradeoff between the compression ratio and the accuracy.
