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Visual Cryptography and Secret Image Sharing by Ching-Nung Yang, Stelvio Cimato

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13

Steganography in Halftone Images

Oscar C. Au, Yuanfang Guo and John S. Ho

Hong Kong University of Science and Technology, China

CONTENTS

13.1 Introduction

While gray-scale images can be readily displayed in computer monitors and other light-emitting displays, they also need to be displayed routinely in other reflective media such as newspaper, magazines, books, and other printed documents. However, in reflective media, the application of ink on the reflective media implies that only 1-bit images (with two tones: black and ...

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