Research On Embedded Surveillance Systems Based On 802.11b Standard

At present,most of video surveillance systems transmit analogue signal.Along with the development of techniques of multimedia and network,there are huge demand of embedded surveillance system,which is which is developing rapidly.It brings surveillance system many benefits,including digital and network surveillance.Besides,WLAN is popular in book-computer,PC and public place.So it's the trend that surveillance system have the function of WLAN.Concerned of the metioned,this paper introduce a embedded surveillance system based on 802.11b.The hardware structure,software design and the development of the driver under linux system are presented.The CPU S3C2410X captures the video signal, then processes them.Usb wireless NIC is used to transfer the processed video signal through WLAN.Finally,a embedded web server is realized on the ARM.It makecustomer can view video through explorer.In the course of design of the system,drivers of Camera and 802.11b NIC on Linux are researched,besides,embedded web server and java program make user access video through internet.This dissertation is focused on the application of wireless network.This paper takes measures to avoid the flicker of pictures,such as grabing two frames once,storing in round buffer,painting with dynamic frequency.Finally, this dissertation introduced the course of system design.The flowchart of system design and instruction of development environment is given.And performance analysis are presented by experiment.