Reversible Data Hiding in 3D Models

Abstract

As mentioned in Chapter 5, 3D model watermarking techniques can be classified into irreversible watermarking techniques and reversible watermarking techniques. Chapter 5 focuses on irreversible watermarking techniques. Now we turn to reversible watermarking techniques in this chapter. In fact, reversible watermarking is a branch of reversible data hiding. Reversible watermarking schemes are designed mainly for copyright protection and content authentication, while reversible data hiding schemes are designed for more application areas, including covert communication, besides copyright protection and content authentication. Reversible data hiding is also called invertible data hiding, lossless data hiding, distortion-free data hiding or erasable data hiding. It was initially investigated and designed for digital images. Then reversible data hiding schemes were reported in the literature for other media such as video, audio, 2D vector data, motion data and 3D models. After the first work on 3D model data hiding was reported [1], most subsequent work focuses on the following four aspects: (1) to improve the robustness of the 3D model data hiding schemes [2, 3] against rotation, translation, scaling, mesh simplification, and so on; (2) to reduce the visual distortions introduced by data embedding [4]; (3) to achieve the goal of blind extraction of the hidden data [5]; (4) to enhance the embedding capacity of the confidential data [6]. Some of these methods are based on transform domains and/or multiresolution analysis [7–9].