Embedding Robust Gray-Level Watermark in an Image Using Discrete Cosine Transformation

Embedding Robust Gray-Level Watermark in an Image Using Discrete Cosine Transformation

Chwei-Shyong Tsai (National Chung Chang University, Taiwan) and Chin-Chen Chang (National Taichung Institute of Technology, Taiwan)
Copyright: © 2002 |Pages: 18
DOI: 10.4018/978-1-930708-29-7.ch013
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Digital watermarking is an effective technique to protect the intellectual property rights of digital images. In general, a gray-level image can provide more perceptual information; moreover, the size of each pixel in the gray-level image is bigger. Commonly, gray-level digital watermarks are more robust. In this chapter, the proposed watermarking scheme adopts a gray-level image as the watermark. In addition, discrete cosine transformation (DCT) technique and quantization method are applied to strengthen the robustness of the watermarking system. Both original image and digital watermark, processed by DCT transformation, can build a quantization table to reduce the information size of the digital watermark. After quantized watermark is embedded into the middle frequency bands of the transformed original image, the quality of the watermarked image is always visually acceptable because of the effectiveness of the quantization technique. The experimental results show that the embedded watermark can resist image cropping, JPEG lossy compression, and destructive processes such as image blurring and sharpening.

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Table of Contents
Timothy K. Shih
Chapter 1
Timothy K. Shih
Distributed Multimedia Database involves network technology, distributed control, security, and multimedia computing. This chapter discusses... Sample PDF
Distributed Multimedia Databases
Chapter 2
Rhong Zhao, William I. Grosky
The emergence of multimedia technology and the rapidly expanding image and video collections on the Internet have attracted significant research... Sample PDF
Bridging the Semantic Gap in Image Retrieval
Chapter 3
Oge Marques, Borko Furht
This chapter provides a survey of the state-of-the-art in the field of Visual Information Retrieval (VIR) systems, particularly Content-Based Visual... Sample PDF
Content-Based Visual Information Retrieval
Chapter 4
Tong Zhao, H. Lilian Tang, Horace H.S. Ip, Feihu Qi
Synergetic Neural Network (SNN) as proposed by Hermann Haken is a novel top-down, self-organized system. In this chapter, its associated discrete... Sample PDF
Content-Based Trademark Recognition and Retrieval Based on Discrete Synergetic Neural Network
Chapter 5
Sagarmay Deb, Yanchun Zhang
Emergence is a phenomenon where we study the implicit or hidden meaning of an image. We introduce this concept in image database access and... Sample PDF
Concepts of Emergence Index in Image Databases
Chapter 6
Chi-wai Fung, Rynson Lau, Qing Li, Hong Va Leong
In this chapter, we describe our work on developing a distributed video DBMS (database management system). The video DBMS provides a temporal... Sample PDF
Distributed Temporal Video DBMS Using Vertical Class Partitioning Technique
Chapter 7
Fulu Li
Video-on-Demand (VoD) systems face scalability problems and Quality of Service (QoS) issues due to the need to satisfy numerous requests for several... Sample PDF
Video-on-Demand: Scalability and QoS Control
Chapter 8
Hang-Bong Kang
The abstraction of a long video is often useful to a user in determining whether the video is worth viewing or not. In particular, video abstraction... Sample PDF
Video Abstraction Techniques for a Digital Library
Chapter 9
Jen-Wen Ding, Yueh-Min Huang, Sheng-Yuan Zeng, Chang-Chung Chu
Generally, a large-scale video server is composed of numerous disk striping groups. The striping policies employed by each disk striping group... Sample PDF
Video Database Techniques and Video-on-Demand
Chapter 10
Ming-Hour Yang, Yu-Chee Tseng
A VoD system is typically implemented by a client-server architecture supported by certain transport networks such as telecom, CATV, or satellite... Sample PDF
Broadcasting Approaches for VOD Services
Chapter 11
Chun-Shien Lu, Hong-Yuan Mark Liao, Jan-Ru Chen, Kuo-Chin Fan
Digital watermarking has been proposed as very useful technology in the protection of digital data such as image, audio, video, formatted documents... Sample PDF
Watermarking on Compressed/Uncompressed Video Using Communications with Side Information Mechanism
Chapter 12
Chin-Chen Chang, Kuo-Feng Hwang
A simple image hiding scheme in spatial domain is proposed in this chapter. The main idea is to utilize a threshold mechanism to embed as much... Sample PDF
Hiding Images Using Dynamic Bit-Replacement and Human Visual System
Chapter 13
Chwei-Shyong Tsai, Chin-Chen Chang
Digital watermarking is an effective technique to protect the intellectual property rights of digital images. In general, a gray-level image can... Sample PDF
Embedding Robust Gray-Level Watermark in an Image Using Discrete Cosine Transformation
Chapter 14
D. Chakraborty, G. Chakraborty, N. Shiratori
The advancement in optical fiber and switching technologies has resulted in new generation high-speed networks that can achieve speeds of up to a... Sample PDF
Multicast: Concept, Problems, Routing Protocols, Algorithms and QoS Extensions
Chapter 15
Fuhua Lin
Synchronization is an important aspect of the design and implementation of distributed multimedia database systems. In this chapter, we first... Sample PDF
Multimedia and Multi-Stream Synchronization
Chapter 16
Chin-Chen Chang, Guang-Xue Xiao, Tung-Shou Chen
BPM is a simple and intuitive method to implement the progressive image transmission. However, its reconstructed image quality at each of the... Sample PDF
A Simple Prediction Method for Progressive Image Transmission
Chapter 17
Ying-Hong Wang
This work presents a novel English distance learning system that was developed through multimedia database and Internet technologies called English... Sample PDF
A Multimedia Database Supports Internet-Based English Learning
Chapter 18
O. Kao, S. Stapel
Cairo is a distributed, cluster-based image retrieval system that provides a high-quality, object-based image analysis and search. The... Sample PDF
Case Study: Cairo - A Distributed Image Retrieval System for Cluster Architectures
Chapter 19
J. F. Diez Higuera, F. J. Diez Pernas
A Virtual Reality Modeling Language (VRML)-based interactive three dimensional museum on the Web is designed and implemented. Users may walk through... Sample PDF
VRML-Based System for a Three-Dimensional Virtual Museum
Chapter 20
Daniel J. Buehrer
This chapter considers the question of how to locate appropriate multimedia objects. The traditional use of Web search engines is limited by the... Sample PDF
Organizing Multimedia Objects Using a Class Algebra Database
Chapter 21
Jiung-Yao Huang
Along with the popularity of the World Wide Web (WWW), merging the virtual reality technique into the WWW environment is a popular area of research... Sample PDF
Use of the Frame Synchronization Technique to Improve the Visualization Realism on the Web
Chapter 22
Chin-Chen Chang, Yi-Ping Hung, Timothy K. Shih, Ren-Junn Hwang
Distributed Multimedia Databases will be a trend for future information repository. With the growing popularity of the Internet and the improvement... Sample PDF
Future Multimedia Databases and Research Directions
About the Authors