Method for Protection of Heterogeneous Data based on Pseudo-Holographic Watermarks
Yuliya Vybornova · 2021
This paper proposes a comprehensive solution for protection of heterogeneous two-dimensional and three-dimensional graphic data from unauthorized distribution and illegitimate changes using pseudo-holographic watermarks. A pseudo-holographic image is a signal, which encodes a binary sequence in the form of sinusoidal functions. The previous research of pseudo-holograms has shown that they are compatible with various popular embedding strategies and besides allow to significantly increase robustness of original watermarking scheme. In this paper, the robustness and information capacity of pseudo-holograms are significantly increased by minimizing the aliasing effect, which occur when the watermark is cropped. For this, a new algorithm for amplitude peak detection is proposed. The approach is based on signal oversampling before DFT calculation and isolating each ring during spectrum analysis. The experimental study has shown the efficiency of a new detection algorithm. The proposed solution allows to select the parameters in such a way as to maintain the resistance to cropping at a given level.