Project Design Of Railway Integrated Video Surveillance System

Video surveillance system is of tremendous importance in railway transportation. Railway security, traffic, electricity, passenger and transportation department and so on has built its own independent surveillance system. These systems use different technology, have different scale and independent of each other, thus, they cannot share resources and have to be built repeatedly which cause a huge waste. In order to solve these problems, the ministry of railway decided to construct an integrated video surveillance system. It is a shared platform, including video surveillance system for traffic, passenger and freight transport and so on. However, the construction of this railway integrated video surveillance system is still in the initial stage, many problems occur in the construction process. This paper will focus on the application of video coding, video storage and video access technology in the railway integrated video surveillance system and puts forward a design scheme based on these.Video codec technology and data storage technology are key technologies in railway integrated video surveillance system. Currently widely used video codec standards are the MPEG-4/H.264. However, MPEG-4/H.264 standard involves dozens of foreign patents belonging to different company organizations respectively. The huge railway integrated video Surveillance system will cause high patent fees with complex bureaucratic procedures. In this paper, we introduce AVS AV coding standard with independent intellectual property rights of our country in the railway integrated video surveillance system and puts forward a new type of communication protocol stack. These can not only save a large number of patent fees, but also reduce decoding complexity while providing comparative coding efficiency to H.264, thus reducing construction cost.At present, the mainly used video data storage technologies in the railway video integrated surveillance system are DAS, NAS and SAN. Many problems have been found in engineering design and construction, such as the low speed of NAS storage system when obtaining stored video information. In this paper, we make a detailed analysis of various storage technologies and put forward a storage technology appropriate for railway integrated video surveillance system. DAS technology and SAN technology are used for'block'storage while NAS technology is for'file'storage. The continuity is poor and the response speed is slow when calling and browsing the history image. Compared with NAS technology, DAS technology and SAN technology are more suitable for video information storage while NAS technology is more suitable for text messages storage. Adopting DAS technology, the whole video network storage devices are scattered, independent and cannot share, the resources use ratio is low. Compared with IP-SAN, the deployment method and construction costs of FC-SAN are much higher, so, the current large network digital video surveillance system uses IP-SAN architecture more. railway Integrated video surveillance systems usually have large scale, with many video approaches, demanding resources sharing. Considering input maintenance cost, this paper recommends the IP-SAN storage technology.At present, the front camera layer in railway integrated video surveillance system has the following access methods:coaxial cable, peer-to-peer optical transceiver and node type optical transceiver. We present a new efficient access method based on the video VPON and EPON. This method has the following advantages:First, save large amount of fiber resources. Second, passive optical network stability. Third, all fiber network security and interference immunity.The proposed railway integrated video surveillance system has the following characteristics:First, adopt AVS coding standard and improve communication protocol stack. Achieve comparative coding efficiency to H.264 and MPEG-4 simply. Avoid a large number of patent fees, save a large mount of investment. Second, adopt IP-SAN storage technology, realize sharing large capacity storage video among networks and reduce the investment. Third, establish video access layer based on the passive optical network (EPON and VPON), save a large amount of fiber resources while achieving nondestructive transmission.