A New Construction of Tagged Visual Cryptography Scheme.

Tagged visual cryptography scheme (TaVCS) is a new type of visual cryptography scheme, in which an additional tag image is revealed visually by folding up each share. A TaVCS not only carries augmented information in each share, but also provides user-friendly interface to identify each share. In this paper, we present a novel method to construct (k, n)-TaVCS. It can adjust visual quality of both the reconstructed secret image and the recovered tag image flexibly. Meanwhile, the proposed method provides better visual quality of both the reconstructed secret image and the recovered tag image under certain condition. Experimental results and theoretical analysis demonstrate the effectiveness of the proposed method.