analysis of the different image transmission applications in highway monitoring（分析不同的图像传输应用在高速公路监控）.doc

Analysis of the different image transmission applications in highway monitoring Abstract: Highway Image video transmission services through the development of non-analog transmission and digital compression and transmission phases, the rise in recent years, the development of network digital video transmission system has been applied in our highways, ushered in a new video transmission stage of development . Keywords: transmission; analog video, digital non-compressed digital network coding An analog video image transmission Highway in the early analog image transmission is mainly used point to point transmission, the use of point to point PDH signals into optical video signals via optical fiber transmission field monitor image or the image charges. Disadvantages of this approach 1) The transmission distance is short, networking is not flexible, not suited to multi-level networking, can not achieve long-distance transmission. Schematic diagram of analog video transmission Each node need to be a 2-core optical fiber, fiber waste of resources, the system constitutes a more complex and require matrix, video splitters and other networking products. 3 equipment almost no management features, the system is more complicated post-maintenance equipment. Because of these shortcomings Optical analog video, with the toll highway system of monitoring and imaging business increased, especially the highway network monitoring and network charges the gradual implementation of such technology does not meet the daily operations of the current highway needs. Digital non-compressed video transmission diagram 2 non-compressed digital transmission This method uses 8bit/10bit digital time-division multiplexing (TDM and optical coarse wavelength division multiplexing (CWDM combination of digital video transmission technology will be field video image through analog to digital converter into a digital signal through the multi-fiber Optical