Structure Aware Visual Cryptography

Visual cryptography is an encryption technique that hides a secret image by distributing it between some shared images made up of seemingly random black‐and‐white pixels. Extended visual cryptography (EVC) goes further in that the shared images instead represent meaningful binary pictures. The origi...

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Bibliographic Details
Published in:	Computer graphics forum Vol. 33; no. 7; pp. 141 - 150
Main Authors:	Liu, Bin, Martin, Ralph R., Huang, Ji-Wu, Hu, Shi-Min
Format:	Journal Article
Language:	English
Published:	Oxford Blackwell Publishing Ltd 01.10.2014
Subjects:	Analysis Categories and Subject Descriptors (according to ACM CCS) Computer graphics Cryptography I.3.8 [Computer Graphics]: Applications-Cryptography Image processing systems Studies
ISSN:	0167-7055, 1467-8659
Online Access:	Get full text
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Summary:	Visual cryptography is an encryption technique that hides a secret image by distributing it between some shared images made up of seemingly random black‐and‐white pixels. Extended visual cryptography (EVC) goes further in that the shared images instead represent meaningful binary pictures. The original approach to EVC suffered from low contrast, so later papers considered how to improve the visual quality of the results by enhancing contrast of the shared images. This work further improves the appearance of the shared images by preserving edge structures within them using a framework of dithering followed by a detail recovery operation. We are also careful to suppress noise in smooth areas.
Bibliography:	istex:73BB49CE980837A4EE3E015DE571D4387D7C9A45 ArticleID:CGF12482 ark:/67375/WNG-3QQ61CVS-L SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14
ISSN:	0167-7055 1467-8659
DOI:	10.1111/cgf.12482