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Halftone visual cryptography (HVC) enlarges the area of visual cryptography by the addition of digital halftoning techniques. In particular, in visual secret sharing schemes, a secret image can be encoded into halftone shares taking meaningful visual information. In this paper, HVC construction methods based on error diffusion are proposed. The secret image is concurrently embedded into binary valued...
This paper considers the problem of encoding a secret binary image SI into n shares of meaningful halftone images within the scheme of visual cryptography. We extend our previous work on halftone visual cryptography and propose a new method that can encode the secret pixels into the shares via simple error diffusion. The noise introduced by encoded secret pixels is totally diffused away to neighboring...
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