Design Of Embedded Wireless Image Monitoring System

With the development and prevalence of computer software and hardware technology, monitoring system based on multimedia technology has played a more and more important role in the video monitoring field. Especially in the important locale such as bank, cashbox and military storage, the reliable and intelligentized monitoring system has heavy demand market. Most of video monitoring systems on the market are composed of industrial control computer which work unstably, and the price is too high. In order to get ride of these defects, in this paper we design a new system based on digital signal processor. The system based on the core processor LPC2214 accomplish the digital gather of analog video signal through high speeding video decode circuit.This context first puts forward the whole structure and design method of the system, then, make sure the project of the image digitize and compress, analyses some basic theories that the system has involved, after that, introduces the method of the alarm image's transport — GPRS.Complete the hardware design of the system. Video gather part include video input and output, the design adopt the integrated video chip SAA7111A to realize the signal conversion of analog video input signal, it adopt the I~2C bus as programming interface of the device.Under the help of CPLD, the system use SAA7111A to digitize the image and compressing it by ZR36060. The system sends the compressed image to the user or surveillance center by GPRS, and then save the data in the SDRSM provide to the user.Complete the software design of the system. First, add the real time opration system uC/OS- II to the system in order to realize modularize of the software design. Then, given the whole design of the system and initialize every module to make sure they work well.On the pivotal problem of system — dealing with the MMS and image alarm,the text has explained in details. We take the method of passive infared detection and moving video detection arithmetic to solve the problem of image alarm. Also, we give the way to avoid the failure of sending MMS.