New Aspects of Network Digital Surveillance: Embedded Video Server
Traditional security products include access control, infrared alarm, smoke sensor, camera and video monitoring, etc. The usual alarm center transmits the information of the front end of the alarm (smoke sensor, infrared ...) to the center through the telephone line dial, the biggest problem is not knowing Whether the alarm is a correct alarm or a false alarm can only be viewed on site. Most camera video surveillance (CCTV) is connected to the monitoring center through a video cable (optical fiber plus optical terminal), the display (TV) and stored in the hard disk video recorder. In addition to the staff on duty, the owner and superior supervisor cannot immediately understand the truth. The embedded network video server can solve the above two problems. It passes the alarm signal to the embedded server through the alarm port or 232/485 data port, at the same time, the camera is directed to the alarm-related area, and connected to the embedded server, these alarms and video multimedia information can be transmitted to the alarm via the network On the mobile phone of the center and the owner, the duty personnel, leaders and owners of the alarm center can immediately view the local video after receiving the alarm information from the computer terminal or the mobile phone terminal to understand the real situation of the alarm.
The traditional installed camera video surveillance (CCTV) is connected to the embedded video server and will be upgraded to a digital third-generation network video surveillance on the network. Duty personnel, leaders and owners can monitor anytime and anywhere. A key technical device for digital information flow, the embedded network video server has the following technical characteristics:
1. It has the core functions of multimedia information processing, including digitizing and compressing the video of the camera into a small digital stream, digitally compressing and encoding the collected audio, and also accepting digital audio from the network, decompressing and playing to achieve monitoring and intercom ; With 232 and 485 control commands and various sensor digital acquisition access communication, and alarm input and output communication, the network video server package these video, audio, digital command signals and data acquisition and alarm information Other communication nodes and terminals of the network. Therefore, the improvement of the video and audio processing capabilities of the embedded network video server, the realization of high-definition video compression, and its use of very little bandwidth and storage resources will become the key technology of digital information flow.
2. It has a powerful communication service function and can realize interconnection with various network nodes and terminals according to the "uniform communication" and NGN communication protocols.
3. It has a powerful wired network and wireless network expansion access function. It can be connected to a wireless local area network (WLAN, WiFi) and 3G broadband wireless through the USB port. To achieve wired and wireless switching, dual network communication is also possible. Transmission, expanding the communication security channel, and achieving ubiquitous network access.
4. The embedded server can be equipped with built-in and plug-in external storage such as small hard disk, flash disk (U disk and SD card, etc.), it can store multimedia information for backup and information sharing, equivalent to Nodes and storage servers for information content on the network.
5. The server has high information security and stability. It is embedded in the device with a Linux kernel and is not subject to any virus.
6. Multi-video resolution and code stream: Select the code stream and the corresponding video resolution (resolution) according to the characteristics of the network. If the mobile phone network is relatively narrow, adaptive low resolution and low code stream should be selected.
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