PERFORMANCE OF ERROR FILTERS IN HALFTONE VISUAL CRYPTOGRAPHY

PERFORMANCE OF ERROR FILTERS IN HALFTONE VISUAL CRYPTOGRAPHY 

Anshul Sharma

Department of Electronic & Communication, Chandigarh University, Gharuan (S.A.S Nagar), India  

ABSTRACT

Visual cryptography encodes a secret binary image (SI) into shares of random binary patterns. In visual cryptography, the decoding process is performed directly by the human eyes; while in general, the shared images need some processing to reconstruct the secret image. The shares are xeroxed onto transparencies, the secret image can be visually decoded by superimposing a qualified subset of transparencies, but no secret information can be obtained from the superposition of a forbidden subset. Halftone visual cryptography is extended technique in visual cryptography where the random shares are embedded in high quality grayscale images to give them meaning and thus reducing the doubt of eve’s droppers that some secure data is hidden. Improved shares have been developed by changing the error filters that were earlier used in halftone visual cryptography via error diffusion and results were compared with the existing work for improvements on visual basis and on mathematical basis using mathematical parameters for index of quality of the image like PSNR and Universal quality index UQI. 

KEYWORDS 

Visual cryptography, error diffusion, halftone visual cryptography, secret sharing, universal image quality index. 

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