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  • Technical characteristics and advantages for development of the perspective of network cameras

        From the hardware structure, the network camera is integrated in the analog camera based on video compression and network transmission processing module, so both the technical characteristics of analog cameras and video servers, is not the simple combination, the unique structural design and The way it has its own technical characteristics. Network camera from the data flow: LENS-> sensor-> isp-> encoding chips -> Network to build a network camera, the former real video capture stream transmission, need to consider a lot of factors, including image quality, video capture, compile the decoder chip select, and follow-scale, network transmission, network security.

        Network Camera Technical Features

        From the hardware structure, the network camera is integrated in the analog camera based on video compression and network transmission processing module, so both the technical characteristics of analog cameras and video servers, is not the simple combination, the unique structural design and The way it has its own technical characteristics.

        1, the video compression

        Video compression is the technical requirements of the basic network camera, network camera video processing chip ASIC-based video compression using MPEG-2, the M-JPEG, MPEG-4 and H.264, scale, including H.264 the mainstream. Recently, based on TIDavinci chip, network cameras have been available, the Davinci is a SoC system, the ASIC efficient handling characteristics, while both the CPU, DSP, different flexibility, it has a main DSP processing system, there is a The ARM9 subsystem, a very important feature is to have an extremely rich interface, these interfaces is proportional to the functional development of the network camera useful, some of the following characteristics is based on this feature available.

        2, the highly integrated

        The network camera is not only with traditional analog camera image acquisition, it has a front-end processing system, with a commensurate rich heterogeneous bus access functions such as VOIP, alarm, 232/485 serial device access In addition, motion detection, video loss, lens cover, storage abnormalities alarm signal sent to the backend through the network. Network cameras can be embedded storage systems, often using a SD card, SD card capacity 8MB ranging up to 4GB SD card image as a network failure of temporary equipment, such as network back to normal, then carried out on video The pass, which can effectively guarantee the continuity and integrity of the video data. The use of the SD card is important alarm images stored locally, while upload backend, this will not lead to the lack of video data due to unreliable transmission network.

        3 Power over Ethernet (POE)

        POE is the rapid development in recent years and the wider application of network-powered technology. POE (PowerOverEthernet) refers to the existing Ethernet Cat.5, cabling infrastructure without changes, in addition to IP-based terminals (such as IP telephones, network cameras, etc.) to transfer data signals at the same time, but also for such devices
    Prepared to provide direct current technology. As a result, network cameras no longer need other power supply. By focusing on the use of the UPS (uninterrupted power supply) can ensure that the equipment in a period of time (according to UPS) without interrupting the operation, but also simplifies the treatment. The IEEE802.3af scale POE Ethernet-based power supply system scale, the scale requires the use of POE power supply equipment, power consumption can not exceed 12.95W.

        Now, most manufacturers provide the network switches support PoE function. If already installed ordinary switch equipment, simply by increased cross (Midspan), you can achieve the functionality of PoE to the switch. Among them, the cross in the main role is to load the power supply to the cable.

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