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Visual secret sharingVSS is one of the cryptographic techniques of Image secret sharing schemeISSS that performs encoding of secret message image text or picture intonoise like black and white images, which are called as shares. Shares arestacked together and secret message image is decoded using human visual system.One of the major drawbacks of this scheme is its poor contrast of the recoveredimage, which improves if computational device is available while decoding. Inthis paper, we propose to improve poor contrast of classical VSS schemes fortext or alphanumeric secret messages and low entropy images. Initially, stackedimage is binarized using dynamic threshold value. A mathematical morphologicaloperation is applied on the stacked image to enhance contrast of thereconstructed image. Moreover, a method is proposed that allows the size of thestructuring element to change according to the contrast and the size of astacked image. We perform experiments for different types of VSS schemes,different share patterns, different share types rectangle and circle, and lowentropy images. Experimental results demonstrate the efficacy of the proposedscheme.

KEYWORDS

Contrast, Mathematical Morphological Operator, Image Secret Sharing, Visual Secret Sharing

Cite this paper

Meghrajani, Y. and Mazumdar, H. 2015 Enhanced Contrast of Reconstructed Image for Image Secret Sharing Scheme Using Mathematical Morphology. Journal of Information Security, 6, 273-279. doi: 10.4236-jis.2015.64027.





Autor: Yogesh K. Meghrajani, Himanshu S. Mazumdar

Fuente: http://www.scirp.org/



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