This paper introduces a method to extract 'Shape-DNA', a numerical fingerprint or signature,
of any 2d or 3d manifold (surface or solid) by taking the eigenvalues (ie the spectrum) of its …

In the area of image retrieval from data bases and for copyright protection of large image
collections there is a growing demand for unique but easily computable fingerprints for …

This paper presents a new data hiding method for curves. The proposed algorithm
parameterizes a curve using the B-spline model and adds a spread spectrum sequence to …

Establishing efficient, effective, and trustworthy engineering collaboration while protecting
intellectual property is vital to maintain organizational competence in today's global …

Shape interrogation methods are of increasing interest in geometric modeling as well as in
computer graphics. Originating 20 years ago from CAD/CAM applications where “class A” …

Despite extensive research and rapid increase of computing power, free-form object
matching still remains a challenging problem in CAD/CAM areas. In this paper, various …

Curvature analysis is frequently employed in shape interrogation. Umbilical points are of
particular interest in curvature analysis because of their identical normal curvatures in all …

This thesis addresses problems of free-form object matching for the point vs. NURBS surface
and the NURBS surface vs. NURBS surface cases, and its application to copyright …

The cyclide spline surface is a G 1 smooth piecewise surface composed of Dupin cyclide
patches, thus inheriting several favorable geometric properties of the Dupin cyclide, such as …

Ridges are characteristic curves of a surface that mark salient intrinsic features of its shape
and are therefore valuable for shape matching, surface quality control, visualization and …