The Research On Embedded Network Video Monitoring System Based On MPEG-4

Video monitoring is applied widely in industry production and daily life.At present new and developing network video monitoring system based on embedded technology have the advantages of smaller volume,lower cost,higher stability and better real time nature than traditional video monitoring,and have fine application and developping prospect.So researching and developing a embedded network video monitoring system has great significance.This dissertation designs a embedded network video monitoring system based on MPEG-4 on the basis of researching current video monitoring system.The video monitoring system is composed of two parts. One is the fore-end embedded network video terminal subsystem,the other is the back-end client subsystem.The two subsystems transmit information and exchange data by transfer network which can be Internet or Intranet.Firstly the dissertation introduces the progress of the video monitoring.The correlative technologies of the embedded network video monitoring system are discussed,including the digitization and coding of audio and video,technology of embedded system and network transmission.Then we research and discuss the overall structure of embedded video monitoring system including the hardware and software of the fore-end and back-end subsystems.On this basis the modules of hardware system are detailed discussed,including the host control module based on MCF5307,communication interface module based on Ethernet and RS485,audio and video collection module based on SAA7114H and CS5340,audio and video coding module based on IME6400.The software of system can be divided into two parts,which are fore-end video terminal subsystem software and back-end client subsystem software.About fore-end video terminal subsystem software the system software dBUG Bootloader andμClinux embedded operating system are first introduced.On this basis,the dissertation analyzes application software which is running onμClinux,including audio and video collection,coding and sending module,Pan/Tilt and camera lens controlling module,user management module and system configuration module.Back-end client subsystem software is used to receive,play,save,replay network audio and video stream,configure server such as Pan/Tilt controlling,accessing controlling and vidicon function configuration.Finally, on the basis of summarization of the research work, some problems which should be discussed deeply are put forward and some suggestions for the future researches are also given.