The digitalization of multimedia data provides much convenience for the storage and extraction of multimedia information. The efficiency and veracity of information expression has got greatly improvement recently. However, the problem of pirate is coming correspondingly. How to ensure the security of this information becomes a hotspot in current research fields. As an important branch
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With the application of GIS technology widely used, digital maps gradually replace the traditional paper maps and become the main carrier in geospatial data storage. As well as the rapid development of network technology and high-speed wireless network technology, WebGIS technology and mobile GIS technology have emerged. The size of geometric data sets in these
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With the rapidly development of multimedia and network communication, the delivery of information becomes digitalized. However, digital media information is easily to be copied, processed, published and transmitted. Thus the problems of the safety and the reality of digital information transmission appear. Digital watermarking is a process of embedding watermark into digital products to prove
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Along with the development of computer science and the Internet, digital maps become more and more popular. Because of their advantages such as small data size, high precision, lossless scaling and easiness to manipulate, vector digital maps are the most important resources in GIS. Vector digital map data protection becomes an urgent problem. Digital watermarking
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The electronic map system for mine is developed to assist rescue robot for mine disaster, and serves the robot’s navigation system. With this system, you can pick-up paths information, which is needed by the navigation system, from existing papery maps or electronic maps after mine disaster. This system can also help the navigation system to
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With the development of information technology and the need of national construction, the applications of geographic information data products expand continuously, and the number of the products keeps a rapid growth. So how to verify the copyright of these data products has become a problem which is an urgent need to be solved in digital
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With the rapid development of the Internet technology, the dissemination of information is becoming easier and faster, which lead to the copyright protection and the legality certification of digital resource of information become hot spots in security technology in the network environment. For their advantages such as high precision, small data size, easiness to operation,
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With the rapid development of web technology and multimedia technology, digital watermarking has been widely used in areas such as copyright protection, data tracking and monitoring, multimedia authentication. For different applications, researchers have proposed various schemes and watermarking algorithms. Based on the actual application of watermarking, this dissertation focuses on the application of watermarking technology
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The two-dimension polyline set, triangle mesh and point sampled model are primary methods of geometric model representation and are widely employed to represent the vector map and three-dimension geometric model corresponsively. How to transmit and operate these geometric models is the important task of real-time graphics. Basing on the principle and methodologies of geometric compression,
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With the fast development of information processing technology and network techniques, digital vector map has becoming the necessary resource being widely used in GIS, intelligent transport system, digital city, digital national defense construction and so on. Digital vector map has great economical value and strategy significance for its accurate content. And its fabricating cost is
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