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Proceedings of CAD'15, 2015, 280-285
Watermarking Scheme for Geometric Data Protection and Detection on 3D CAD Assembly Model

K. M. Yu, W. K. Chiu, The Hong Kong Polytechnic University
K. M. Au, HKU SPACE Community College

Abstract. Nowadays, different contemporary products are modeled in a CAD environment. These involved a number of components and assembled together to form an assembly model. Such related components of a product are assembled by different mating conditions in a product design and development stage. Normally, the assembly model would be distributed to different personnel involved in the process. To ensure that the assembly model received is an original one and is not modified by any unauthorized persons, watermarks should be embedded into the model. Different watermarking schemes have been proposed for watermarking 3D geometrical models. A public watermarking scheme was proposed by Fornaro et al for authenticating CSG models. Sun et al developed a scheme for non-uniform B-spline surface and the watermark is embedded into the sample points. Ohbuchi et al discussed the problem of watermarking non-uniform rational B-spline (NURBS) surfaces. Other schemes for watermarking parametric surfaces can also be found elsewhere. Chou et al focused on the issue of watermarking 3D polygonal models. Wang et al proposed a watermarking scheme for authenticating 3D polygonal model based on integral invariants. In other works the vertices are clustered to a number of patches and the watermarks are then embedded into selected normal vectors.

Keywords. Assembly model, Watermarking, CAD, Hash value, Product development

DOI: 10.14733/cadconfP.2015.280-285