Enhancement of image hiding by exchanging two phase masks
Yan Zhang, Bo Wang, Zhili Dong · Journal of Optics A Pure and Applied Optics · 2009
Recently, a new image hiding method based on optical interference was proposed. The image is hidden in two pure phase masks. However, the silhouette of the encrypted image can be obtained by using just one of these two masks, which reduces the secrecy of the algorithm. A method for secrecy enhancement based on exchanging the same parts of two masks is proposed. This method can effectively remove the silhouette of the encrypted image constructed using just one mask. Simulations are carried out to demonstrate the validity of this method.