Design Of Image Acquisition And Wireless Transmission System For Barley Field Based On ARM And WiFi

Along with the rapid development of information science and technology and modernmonitoring technology, the agricultural informationization has become the main trend of China’sagricultural development. The real-time and effective Intelligent monitoring and research whichwere used to monitor diseases and insect pests in the life cycle of crops, was not only beneficialto change the traditional extensive agriculture management methods to improve the efficiency ofagricultural production and crop yields, but also enough to motivate the degree of informationtechnology in China’s agriculture and to enhance the process of agricultural modernization.The barley is a kind of important economic crops in northwest region and important rawmaterial for the production of beer. Pyrenophorateres(Sacc.), Cochliobolus-sativus(Ito et Kurib.),Rhynchosporium secalis(Oudem.) and aphids and other pests and diseases were appeared in thegrowth process of the barleys, which could directly affect the quality and yield of barleys and theincome increasing continually of the farmers. According to above all, this thesis designed a kindof video monitoring system of the barley fields, which was based on image sensor technology,embedded technology and WiFi wireless communication technology, etc. This thesis mainlycompleted the following aspects of contents:(1) The design of image acquisition module Considering the wiring difficulties of thefield monitoring, the embedded system scheme is based on S3C2440and CMOS image sensor(OV9650) to monitor the actual growth situation of barley field, which combined withcharacteristic of S3C2440chip and OV9650module.(2) The design of image compression module The demand of image pixels for the systemwas not so high in the late processing, in order to ease the force of bandwidth in the process ofwireless transmission, therefore libjpeg image CODEC library, which written in C languagecompletely, strongly portability, loss compression and open-source, was used to compress theimages collected into JPEG format.(3) The design of image wireless transmission module It was bound to have higherrequirements for bandwidth and transmission speed to achieve the barley field video monitoring,therefore88w8686WiFi wireless card, manufactured by Marvell Company,which has theadvantage of high integration, low cost and low design difficulty and supported1/2Mbps IEEE802.11.5.5/11Mbps IEEE802.11b and6/9/12/18/24/36/48/54Mbps IEEE802.11a/g, waschose to realize the wireless transmission of video images.(4) The system software design The embedded Linux system was built after theBootloader and Linux kernel transplanted and the root file system constructed. The OV9650and88w8686driver programs were developed and transplanted; the required application systemswere developed and written; the codec library of libjep and the embedded Web server weretransplanted. In the end, users entered the IP address of the embedded device through thebrowser of the upper machine(PC) to monitor the growth situation of the barley fields.(5) Performance experiments In the end, the information monitoring system of barleyfield was tested in the actual environment.The experimental results showed that the designedsystem could realize the desired objectives and demanded of the design requirements.