[ Huaqiang Security Network News ] At present, more and more network surveillance cameras have entered the market, and it has become an important part of the security market. The network camera can be directly connected to the digital network of TCPIP, so the main function of this system is to transmit video and audio over the Internet or through the internal LAN. From the internal structure, the basic structure of the network camera is generally composed of image sensors, video encoders, network servers, external alarms, control interfaces and other parts. 
Compared with traditional analog cameras, the core technology of network cameras is video encoders. Now, let's do a technical analysis on each part of the network camera, and then focus on the core video encoder part.
1. Image Sensor <br> The traditional analog camera collects video information through an image sensor, and then directly outputs an analog video signal, which is outputted through the video line. There are two main types of image sensors for cameras, namely CMOS and CCD. Since CCD has certain advantages over CMOS in image quality, the image sensor used in monitoring engineering is mainly CCD, and most of the mainstream manufacturers of CCD are Japanese companies, such as Sony and Sharp, which account for almost all of the global CCD market. More than 90% share.
2. Video Encoder <br> Its function is to digitally encode the video signal of CCD according to a certain format, and some of them directly capture the BT output of CCD. Some of the signals of the 656 are analog signals that are acquired by the CCD drive output, and are analog-digital converted by a video AD. There are many standards for video coding, and now the main standards for network cameras are MJPEG, MPEG4 and H. 264.
3. Network server <br> Its function is to output the compressed video signal through the TCP/IP protocol, and basically support the current mainstream communication formats, such as support for PPPOE, DNS, UDP, TCP, and so on.
4. External alarm and control interface <br> External alarm and control interface are auxiliary functions of network camera, mainly through serial port or 10 ports. The serial port mode includes RS232 and RS485.
1. Image Sensor <br> The traditional analog camera collects video information through an image sensor, and then directly outputs an analog video signal, which is outputted through the video line. There are two main types of image sensors for cameras, namely CMOS and CCD. Since CCD has certain advantages over CMOS in image quality, the image sensor used in monitoring engineering is mainly CCD, and most of the mainstream manufacturers of CCD are Japanese companies, such as Sony and Sharp, which account for almost all of the global CCD market. More than 90% share.
2. Video Encoder <br> Its function is to digitally encode the video signal of CCD according to a certain format, and some of them directly capture the BT output of CCD. Some of the signals of the 656 are analog signals that are acquired by the CCD drive output, and are analog-digital converted by a video AD. There are many standards for video coding, and now the main standards for network cameras are MJPEG, MPEG4 and H. 264.
3. Network server <br> Its function is to output the compressed video signal through the TCP/IP protocol, and basically support the current mainstream communication formats, such as support for PPPOE, DNS, UDP, TCP, and so on.
4. External alarm and control interface <br> External alarm and control interface are auxiliary functions of network camera, mainly through serial port or 10 ports. The serial port mode includes RS232 and RS485.
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