introduction
Today, with the rapid development of digital video surveillance technology, digital video surveillance systems are rapidly penetrating into various industries, such as enterprises, coal mines, schools, and public places, bringing a big change to people's work and life. Since digital video, audio, voice and voice technologies can be implemented in the DaVinci platform, DaVinci technology can lay the foundation for the current transformation of digital video surveillance systems.
At the same time, with the opening of 3G network, more high-definition mobile digital monitoring system provides the possibility of realization.
The 3G mobile video surveillance system to be designed in this article is a mobile real-time video surveillance system that can provide video acquisition, video data compression, linkage alarm, satellite positioning and network transmission functions. The main technical bottlenecks are: â‘ Whether the system's time-consuming can guarantee its real-time requirements, the key is the time-consuming H.264 compression algorithm. Due to the limitation of the embedded environment resources, in real-time transmission of video data and image quality, especially in the case of multi-channel, it has not been guaranteed. But with the maturity of DaVinci technology, its dual-core architecture of ARM 926EJ-S and DSP C64x +, H.264 compression algorithm runs independently on the Codec Server side of DSP, which solves the time-consuming requirements of the system to ensure its real-time performance. â‘¡Whether its 3G wireless network transmission can guarantee the video quality and real-time performance. In terms of ensuring video quality and real-time transmission requirements, you can start from two aspects: â‘ shorten the transmission time of video data, use the most efficient H.264 encoding technology to reduce the amount of information transmitted, and use dynamic adaptive adjustment of video data Frame rate to reduce the amount of transmitted information to adapt to wireless bandwidth and jitter. â‘¡Realize the QoS mechanism of video data transmission, design and implement the QoS mechanism of 3G wireless transmission by yourself, choose the real-time transmission control protocol RTCP and RTP to use in conjunction, can realize the optimization of transmission efficiency with effective feedback and minimum overhead, so it guarantees Video quality and real-time.
1 System architecture and working principle
This system adopts the scheme of DaVinci processor (TMS320DM6446), DDR2SDRAM (MT47H64M16), NAND FLASH (K9F1208X0C), video decoder TVP5150, 3G chip (ZTE MC8360), GPS satellite positioning chip plus peripheral interface chip. The analog video signal collected by the CCD camera is transferred into the video decoder, and is converted into an analog / digital signal to output a digital video signal conforming to the ITU-BT.656 standard. The digital video signal is then transmitted to the front end of the video processing subsystem for preprocessing. The digital video signal is added to the black and white subtitles on the white background through the OSD subtitle adding algorithm designed by me. After being encoded by the Codec Engine, it is sent to the 3G transmission chip through the USB2.0 bus port and wirelessly transmitted to the remote video monitoring center; detected by the DaVinci processor Carry out satellite positioning commands, receive GPS satellite positioning information through the serial port, and then pass the GPS satellite positioning information to the 3G transmission chip, wirelessly transmit it to the remote video surveillance center, and calibrate its coordinate points and movement trajectories on the map. The DSP terminal on the DM6446 is mainly responsible for video encoding and decoding. The ARM terminal is used as a controller to control the video decoding chip, 3G transmission chip, GPS positioning chip and peripheral interface chip. The block diagram of the system hardware structure is shown in Figure 1.
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How is it installed? Lugs connect directly to the battery terminals.
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Shenzhen Daceen Technology Co., Ltd. , https://www.daceen-sz.com