Enhance the visual quality of shares and recovered secret on meaningful shares visual secret sharing.

ABSTRACTVisual secret sharing (VSS) schemes have been proposed by Naor and Shamir [1] in 1995. It encodes a binary secret image into several meaningless images called shares or transparencies. The secret image can be obtained by stacking the qualified set of shares without any complex computation. This paper proposed a (k, n) VSS scheme which encodes a secret into n meaningful shares, and these shares can be grayscale or color images. People gather k or more shares can recover the secret information by stacking these shares together, but nothing when number of shares less than k. The scheme improves Tsai et al.'s scheme [2] which provided lower quality of recovered secret. Experimental results show that our scheme provides higher visual quality of shares and recovered secrets.