Research And Implement On A New Type Home Alarm System Based On STM32

With the improvement of people's living standard,the problem of home security has been concerned by more and more people.This paper designs a video monitoring system by combining image processing technology and embedded technology through analyze the development of Home Safety Monitoring System and Intelligent Monitoring Alarms that already exists.This system can monitor the house remotely through GPRS technology and mobile phone.Firstly,this paper confirms purposes and principles of design after analyzing the domestic market environment.Besides,introduce the related knowledge about the hardware platform of STM32 and other technologies,such as embedded technology,GPRS technology and image processing technology.Secondly,the embedded hardware system is divided into three modules according to the thought of modular.They are respectively master control module,OV7725 image acquisition module and GPRS wireless communication module.Besides,introduces the chip's characteristics which used by each module and the interface between STM32 and chips.After the above parts,design the circuit diagram of the embedded system.Again,this paper studied the monitoring algorithm and image coding algorithm of JPEG.This paper not only design a algorithm that use for motion detection base on background subtraction and frame difference,but also improved the method of two times that use for image connected area labeling.After moving objects is detected,extract shape features of moving objects and judge alert according to the features of area and length-width ratio.Finally,this paper realized the drivers of each hardware peripheral,transplanted ?C/OS-? operating system and FAT file system to STM32,realized the program of Send and receive MMS(SMS).This paper divided the embedded software system into four tasks.After the ?C/OS-? operating system is running,test the embedded system.