Visual Cryptography from Halftone Error Diffusion - Visual Cryptography and Secret Image Sharing - page 1

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Visual Cryptography from Halftone Error
Diffusion

Gonzalo R. Arce
University of Delaware, USA

Zhongmin Wang
University of Delaware, USA

Giovanni Di Crescenzo
Telcordia Technologies Inc., USA

CONTENTS
1.1

Introduction :::::::::::::::::::::::::::::::::::::::::::::::::::::: 2

1.1.1 Visual Cryptography :::::::::::::::::::::::::::::::::::: 2

1.1.2 Halftone Visual Cryptography :::::::::::::::::::::::::: 3

1.1.3 Blue Noise Error Diusion :::::::::::::::::::::::::::::: 3

1.2 Visual Secret Sharing :::::::::::::::::::::::::::::::::::::::::::: 5

1.2.1 Notion and Formal Denitions :::::::::::::::::::::::::: 5

1.2.2 Construction of VSS Scheme :::::::::::::::::::::::::::: 8

1.3 Halftone VSS Construction Using Error Diusion :::::::::::::: 9

1.3.1 Share Structure :::::::::::::::::::::::::::::::::::::::::: 9

1.3.2 Distribution of SIPs and ABPs :::::::::::::::::::::::::: 11

1.3.3 Generation of Halftone Shares via Error Diusion :::::: 14

1.4 Halftone VSS Construction Using Parallel Error
Diusion ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 16

1.5 Quality of Halftone Shares ::::::::::::::::::::::::::::::::::::::: 17

1.6 Discussion :::::::::::::::::::::::::::::::::::::::::::::::::::::::: 19

1.6.1 Improvement of Image Quality :::::::::::::::::::::::::: 19

1.6.2 Comparison with Other Methods ::::::::::::::::::::::: 19

1.6.3 Image Decoding :::::::::::::::::::::::::::::::::::::::::: 19

1.7 Simulation Results ::::::::::::::::::::::::::::::::::::::::::::::: 20

1.8 Conclusion :::::::::::::::::::::::::::::::::::::::::::::::::::::::: 26

Bibliography :::::::::::::::::::::::::::::::::::::::::::::::::::::::: 27