We present a new watermarking scheme for joint ownership verification of digital images. In the proposed scheme, the watermarking key is held by a trust third party (TTP), and it is kept secret to all co-owners using Shamir's secret sharing scheme. Each owner is assigned a share of the watermarking key and a distinct detection watermark. The scheme can provide individual and joint watermark detections, and the robustness of individual watermark detections does not decrease with the increase of co-owners. Experimental results and analysis demonstrate that the scheme is effective for joint ownership verification and is robust to common image processing operations.
Guofu Gui,
Lingge Jiang,
Chen He,
"Watermarking for joint ownership verification of digital images," Journal of Electronic Imaging 15(1), 013010 (1 January 2006). https://doi.org/10.1117/1.2178293