Lecture02 - Introduction to Digital Watermarking

武汉理工大学《数字水印算法设计》课程设计任务书

目录

摘 要 ................................................................................................................................................ 1

Abstract ............................................................................................................................................. 2

1.数字水印技术概述 ....................................................................................................................... 3

1.1 数字水印技术提出的背景 ............................................................................................... 3

1.2 数字水印的基本特点 ....................................................................................................... 3

1.3 数字水印的应用 ............................................................................................................... 4

A DIGITAL WATERMARK

R.G.van Schyndel(*), A.Z.Tirkel(+), C.F.Osborne(*)

(*) Department of Physics, Monash University, Clayton, 3168, Australia.

(+) Scientific Technology, 21 Walstab St, E. Brighton, 3187, Australia.

ABSTRACT

This paper discusses the feasibility of coding an "undetectable"

digital water mark on a standard 512*512 intensity image with an 8

bit gray scale. The watermark is capable of carrying such

information as authentication or authorisation codes, or a legend

essential for image interpretation. This capability is envisaged to

find application in image tagging, copyright enforcement,

counterfeit protection, and controlled access. Two methods of

implementation are discussed. The first is based on bit plane

manipulation of the LSB, which offers easy and rapid decoding.

The second method utilises linear addition of the water mark to the

学术研究Academic Research信息安全与通信保密・2007.6217袁德明（徐州建筑职业技术学院计算机技术工程系，江苏　徐州　２２１００８）【摘 要】论文将原始彩色图像转换成灰度图像，通过密钥和非线性映射产生两个独立的实值序列，再从中派生出两个二值序列，先用两个实值序列置乱和加密二值水印图像，然后用派生的两个二值序列把被加密的水印图像嵌入到灰度图像中，实现数字水印。实验结果表明，这种数字水印鲁棒性强，隐蔽性好，具有一定的抗剪切和抗有损压缩攻击的能力。【关键词】混沌映射；数字水印；置乱；鲁棒性【中图分类号】ＴＰ３０９．７ 【文献标识码】Ａ 【文章编号】１００９－８０５４（２００７）　０６－０２１７－０３Digital Watermarking Algorithm Based on Double Chaos Map*YUAN Deming(Department of Computer Engineering, Xuzhou Institute of Architectural Technology, Xuzhou Jiangsu 221008, China)【Abstract】After translating the original color image into gray image, and double chaotic sequences are created by twogroup chaos map with different parameters, in which two group independent actual value sequences are composed by thelaw of nonlinear, then two binary chaotic sequence generated by the two actual value sequences. Firstly, the binary water-mark image is disarranged and encrypted by the two actual value sequence, secondly, the encrypted watermark image isembedded into the translated gray image by the two binary chaotic sequence, finally, translating the gray image thatcontain encrypted watermark image is translated into the color image. This digital watermark has such features as goodrobustness, passive features, anti-splitting ability and anti-losing image compression ability and is easy to realize.【Keywords】chaos map; digital watermark; disorder; robustness用双混沌映射实现的数字水印算法＊

1 Teaching Design for Digital Design and Computer

Architecture: ARM Edition, Second Edition (English

Version)

Background and Objectives

Digital design and computer architecture are two foundational

disciplines in computer engineering. They form the basis for designing,

implementing, and optimizing various computer systems, ranging from

embedded devices, microprocessors, to high-performance computing

clusters and cloud data centers.

The ARM architecture is one of the most popular and widely-used

computing architectures in the world. It is the foundation for many

consumer electronics devices, such as mobile phones, tablets, and smart

watches, as well as industrial and automotive applications.

The second edition of the ARM-based digital design and computer

architecture course ms to provide students with a comprehensive