Visual Cryptography and Secret Image Sharing

11

Resolving the Alignment Problem in Visual Cryptography

Feng Liu

Institute of Software, Chinese Academy of Sciences, China

CONTENTS

11.1 Introduction

11.2 Preliminaries

11.3 Misalignment with Integer Number of Subpixels

11.4 Misalignment with Less Than One Subpixel

11.4.1 Shares with Slightly Misalignment Can Still Recover the Secret Image

11.4.2 Large Subpixels Have Better Misalignment Tolerance

11.5 A Misalignment Tolerant VCS

11.5.1 The Algorithm

11.5.2 Simulations

11.6 Conclusions and Discussions

11.7 Acknowledgments

Bibliography

11.1 Introduction

The basic principle of the Visual Cryptography Scheme (VCS) was first formally introduced by Naor and Shamir [10]. The idea of the VCS proposed in [10] is to split an image into ...