| As an important part of monitoring control systems, the expressway video monitoring system plays a vital role in the operation management of expressway. With the rapid development of network technology, automation controlling technology, microprocessor technology, communication technology and digital information technology, the traditional single point and local monitoring control systems are not able to fulfill the demand so far. To achieve the informatization and networking of video monitoring system, sufficient resource sharing and unified management, networked expressway video monitoring is imperative.Networked expressway video monitoring technology is an integrated application of technologies, such as digital image video coding, communication network, industrial control and etc. video coding and compression technology is the core technology of video monitoring system. This paper investigates and compares a few video coding standard such as MPEG-1,MPEG-2,MPEG-4,H.263,H.264, indicates that the H.264 standard is more appropriate in this system. Based on the expressway video network, to meet the further need of expressway intelligence management, there raises the investigation of traffic incident detection technique. The core of traffic incident detection is detection algorithm. This paper expatiates basic principles of existent representative algorithm, and the capabilities of several kinds of algorithm are compared.This paper introduces the development background and progress, status quo and prospect of the expressway monitoring system, states the significance and target of the system research, investigates the basic theories and key technologies, analyses the functional requirements of the system. Based on the above statements, this paper suggests the overall system designing idea which built on distributed video network monitoring system, also gives practical designing examples of provincial networked expressway video monitoring system, designs and programs system application software which carry out basic functions of network video monitoring, and summarizes the system's performance features. |
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