IEEE Trans Image Process - Color extended visual cryptography using error diffusion.

Tópicos

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Resumo

Color visual cryptography (VC) encrypts a color secret message into n color halftone image shares. Previous methods in the literature show good results for black and white or gray scale VC schemes, however, they are not sufficient to be applied directly to color shares due to different color structures. Some methods for color visual cryptography are not satisfactory in terms of producing either meaningless shares or meaningful shares with low visual quality, leading to suspicion of encryption. This paper introduces the concept of visual information pixel (VIP) synchronization and error diffusion to attain a color visual cryptography encryption method that produces meaningful color shares with high visual quality. VIP synchronization retains the positions of pixels carrying visual information of original images throughout the color channels and error diffusion generates shares pleasant to human eyes. Comparisons with previous approaches show the superior performance of the new method.

Resumo Limpo

color visual cryptographi vc encrypt color secret messag n color halfton imag share previous method literatur show good result black white gray scale vc scheme howev suffici appli direct color share due differ color structur method color visual cryptographi satisfactori term produc either meaningless share meaning share low visual qualiti lead suspicion encrypt paper introduc concept visual inform pixel vip synchron error diffus attain color visual cryptographi encrypt method produc meaning color share high visual qualiti vip synchron retain posit pixel carri visual inform origin imag throughout color channel error diffus generat share pleasant human eye comparison previous approach show superior perform new method

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