Visual Cryptography and Secret Image Sharing

1

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

1.1.1 Visual Cryptography

1.1.2 Halftone Visual Cryptography

1.1.3 Blue Noise Error Diffusion

1.2 Visual Secret Sharing

1.2.1 Notion and Formal Definitions

1.2.2 Construction of VSS Scheme

1.3 Halftone VSS Construction Using Error Diffusion

1.3.1 Share Structure

1.3.2 Distribution of SIPs and ABPs

1.3.3 Generation of Halftone Shares via Error Diffusion

1.4 Halftone VSS Construction Using Parallel Error Diffusion

1.5 Quality of Halftone Shares

1.6 Discussion

1.6.1 Improvement of Image Quality

1.6.2 Comparison with Other ...