Abstract
The integration of wireless communication and embedded video systems is a demanding and interesting topic which has attracted significant research efforts from the community of telecommunication. This chapter discusses the challenging issues in wireless video surveillance and presents the detailed design for a novel highly-secure video surveillance system over ad hoc wireless networks. To this end, we explore the state-of-the-art cross domains of wireless communication, video processing, embedded systems, and security. Moreover, a new media-dependent video encryption scheme, including a reliable data embedding technique and real-time video encryption algorithm, is proposed and implemented to enable the system to work properly and efficiently in an open and insecure wireless environment. Extensive experiments are conducted to demonstrate the advantages of the new systems, including high security guarantee and robustness. The chapter would serve as a good reference for solving the challenging issues in wireless multimedia and bring new insights on the interaction of different technologies within the cross application domain.
Key Terms in this Chapter
Surveillance System: A closed-circuit television system used to monitor something.
Discrete Cosine Transform: (DCT): A Fourier-related transform algorithm that is widely used for data compression. DCT converts data (pixels, waveforms, etc.) into sets of frequencies and expresses a function or a signal in terms of a sum of sinusoids with different frequencies and amplitudes. It is often used in signal and image processing, especially for lossy data compression.
Network Processor: An integrated circuit that is optimized for networking and communications functions, typically programmable CPU chip.
Scalability: A property of a system, a network, or a process that can be modified to fit the problem area, that is, scaled to perform well with large-scale users.
GOP: The group of pictures (GOP) is a group of successive pictures within a MPEG-coded film or video stream. A GOP consists of all the pictures in successive two GOP headers.
Wireless Network: A telecommunications network whose interconnections between nodes use standard protocol, but without the use of network cabling.
Watermarking (Digital Watermark): A technique used to add hidden copyright notices or other verification messages in a digital signal or video so that it cannot be detected by a standard playback device or viewer.
Ad Hoc Network: A local area network created for a specific purpose and established for a single session and does not require a router or a wireless base station. Specially, a wireless ad hoc network is a self-organized computer network with wireless communication links.