Design Of Wireless Video Monitoring System Based On ARM

With the rapid development of embedded technology, video codec technology,wireless communication technology and sensor technology, to design a small size, low cost,ease of application of wireless video surveillance system has become possible. Currentlypopular wireless video surveillance system is mainly based on the PC as a server-sidedisplay, based embedded processor+software/hardware codec as a complete videosurveillance video surveillance terminal. Main method is based on an embedded processorfor the master processor to control USB camera capture video signal encoding and decodingalgorithms through software or hardware codec chip, the collected signal compression, afterthe compressed data through the wireless chip transfer to a PC; PC machine by writingsoftware to decompress the video signal and display. The high cost of these products,inflexible, immovable, usually used in supermarkets, bank cash machines, factories,residential wireless intelligent monitoring and management, etc., and for similar babymonitors, video intercom, outdoor security monitoring and other applications are can not bereached. The subject of the design of wireless video surveillance system to monitor anddisplay terminal end can move freely, and low cost, small size, low power consumption,application flexibility, the wireless camera, baby monitors, home security, video intercom,and other aspects wide range of applications, for the majority of the popular consumerelectronics groups.The subject of the design of wireless video surveillance system consists of videosurveillance and video display terminal side of two parts, video surveillance terminal for themaster to Cortex-M3processor, combined with ADV611video codec chip2.4G wirelesstransmission chip with dedicated on-site A7130video image capture, compression andtransmission to the video display terminal; video shows the opposite end of the process, thewireless chip receives the extracted data to the TFT display screen.This paper conducted a study of video encoding and decoding. In previous studies,based on the sum of the wireless video transmission requires encoding causes a variety ofcoding principles and methods to understand the popular video encoding protocols; focus onthis basis, the wavelet transform method has been introduced to discuss the their advantages and disadvantages, and the use of this method ADV611hardware codec chip’s internalstructure, working principle, control method, software programming was introduced.In addition, this knowledge of wireless communications has been studied. Includingcommon Bluetooth, WIFI, Zegbee,2.4G ASIC, Sub1G dedicated chip was introduced.Special emphasis on2.4G chip’s internal structure, working principle, communicationprotocols, control, software control were introduced; also involved in the process of videotransmission to packet loss, interference and other issues of frequency hopping spreadspectrum solution, make transmission more smoothly.Familiar with the various modules in the future, through the three steps to achievewireless video surveillance, the first step is to use the STM32control COMS camera forimage acquisition, transmission through the cable, the camera to record the video display onthe TFT screen; second step STM32control wireless chip A7130is a complete picture ofthe sending and receiving, the received picture displays on the TFT screen; The third step isto control the ADV611STM32video data compression, the compressed video data viawireless transmission to display side, the video display terminal control with STM32ADV611video decompression, and display on the TFT screen. Currently the first two stepshave been achieved, after a step in debugging, debugging problems encountered in thepaper to share with you.Paper is structured as follows: First, the development of video surveillance systemsand applications analysis, to understand the current research trends and applications;determine the direction, the comparison for the master processor, video capture,compression and transmission of the various modules performance, cost and powerconsumption, select a set of their own programs; after the works of each module, controlmethods, and software programming were introduced; final commissioning of the system,the problems encountered in the process and solutions to make elaborate, and lessonslearned for improvements.