Watermarking of models destined to 3D printing by deformation of surfaces

Details

Supervisors

Macq, Benoît

Faculty

Ecole polytechnique de Louvain

Degree label

Master [120] : ingénieur civil en informatique

Abstract

The use of digital models has not stopped growing in the last few years due to the expansion of 3D printing. Following this growing demand of digital models, the industry has expressed a strong interest in the ability to watermark the models they create. The term "watermarking" defines the process of inserting a mark into an object that should be sold or kept private. Its primary goals are to prove the ownership or identify the source of an unauthorized distribution. This works reviews three different watermarking schemes and compares them in terms of robustness, imperceptibility, capacity and time. The first algorithm presented is based on the principle of volume moments in order to determine which patches to modify and to what extent. The two next algorithms use a spectral decomposition to select and modify the frequencies of the model that would cause the barely visible distortions. They differ mostly in the way that they divide the model into sub-meshes. The first one creates classical patches while the second one divides the model into layers.