Abstract
This paper proposes a polynomial-style region incremental multisecret image sharing (PBRIMSIS), for sharing multiple secrets in an image among n participants. The method enables the dealer to distribute the content of an image S to multiple regions, where each region is asso- ciated with a certain level of secrecy. In the proposed n-level PBRIMSIS scheme, input image S is encoded to n + 1 shadow images that exhibit the following features: a. each shadow image cannot reveal any region in S ,b . anyt (2 ≤ t ≤ n + 1) shadow images can be used to reveal these regions associated with up to t - 1 secret levels, and c. S can be com- pletely reconstructed when all of the n + 1 shadow images are available. A discrete cosine transform-based PBRIMSIS with a smaller shadow im- age scheme is designed to improve the transmission and storage of the generated shadow images. The property of incremental disclosure to the region-based secrets in an image is applicable to image sharing in diverse applications that require the sharing of multiple secrets with different se- crecy priorities, such as in cooperative working or in military secrets. C � 2011
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