Watermarking Algorithm for Bas-Relief Based on Depth Grayscale Image

As a result of the development of various digital technologies, relief generation tends to be digitization. At the same time, the copyright protection is becoming more prominent. Currently research on digital watermarking for bas-relief has not been found in the literature libraries. The relief is considered to be a medium between 2D images and 3D models, we think relief watermarking can provide great help for the study of 3D watermarking in the future. In this paper, we propose a new reference indicator—edge block ratio. Under this index, we combine the two-dimensional cepstrum image watermarking algorithm and edge detection technology to achieve bas-relief watermarking. Through a lot of experiments, the method can better meet the invisibility of the relief watermark, as well as the robustness to common relief editors. It points out a new direction for bas-relief watermarking.