Three-dimensional mesh model watermarking method using segmentation and apparatus thereof

A method of detecting a watermark in a three-dimensional (3D) mesh model, the method comprising:

• calculating a geometric primitive of the 3D mesh model, the geometric primitive comprising a degree of similarity to a shape selected from a group consisting of a sphere, cylinder, or cone;
• dividing the 3D mesh model into a plurality of mesh segments by using the geometric primitive, wherein the dividing of the 3D mesh model comprises dividing the 3D mesh model into the mesh segments by clustering according to similarity of the geometric primitive;
• converting the mesh segments into mesh segments of a vertex distance-based coordinate system;
• detecting the watermark in each of the mesh segments of the vertex distance-based coordinate system;
• and
• determining a final watermark based on the watermark detected in each of the mesh segments by watermark trace analysis, wherein watermark trace analysis comprises determining a statistical value for each of the mesh segments.

An apparatus for inserting a watermark into a three-dimensional (3D) mesh model, the apparatus comprising:

• a calculation unit configured to calculate a geometric primitive of the 3D mesh model, the geometric primitive comprising a similarity to a shape selected from a group consisting of a sphere, cylinder, or cone;
• a division unit configured to divide the 3D mesh model into a plurality of mesh segments by using the geometric primitive, wherein the division unit divides the 3D mesh model into the mesh segments by clustering according to similarity of the geometric primitive;
• a conversion unit configured to convert the mesh segments into mesh segments of a vertex distance-based coordinate system, the distance-based coordinate system being a cylindrical coordinate system;
• an insertion unit configured to insert the watermark into each of the mesh segments of the vertex distance-based coordinate system;
• and
• a restoration unit configured to restore the mesh segments into which the watermark is inserted to a Cartesian coordinate system.

An apparatus for detecting a watermark in a three-dimensional (3D) mesh model, the apparatus comprising:

• a calculation unit configured to calculate a geometric primitive of the 3D mesh model, the geometric primitive comprising a similarity to a shape selected from a group consisting of a sphere, cylinder, or cone;
• a division unit configured to divide the 3D mesh model into a plurality of mesh segments by using the geometric primitive, wherein the division unit divides the 3D mesh model into the mesh segments by clustering according to similarity of the geometric primitive;
• a conversion unit configured to convert the mesh segments into mesh segments of a vertex distance-based coordinate system;
• a detection unit configured to detect the watermark in each of the mesh segments of the vertex distance-based coordinate system;
• and
• a determination unit configured to determine a final watermark based on the watermark detected in each of the mesh segments by watermark trace analysis, wherein watermark trace analysis comprises determining a statistical value for each of the mesh segments.