[ Pacific Security Network News ]
Do you know what is the core part of the webcam? Everyone knows that the reputation of network cameras has become popular all over the world. It is powerful and easy to use, which provides a guarantee for people's safety. So what is the core of the network camera? Let me introduce you to the following.
The network camera can be directly connected to the digital network of TCP/IP, 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.
Image Sensor
The traditional analog camera collects video information through an image sensor, and then directly outputs an analog video signal, which is externally output 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.
Video encoder
Its function is to digitally encode the video signal of CCD according to a certain format, and some of them directly capture the BT of the CCD output. 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.
Network Server
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.
External alarm and control interface
External Alarms and Controls The reputation of network cameras has become popular all over the world. It is powerful and easy to use, providing a guarantee for people's safety. So what is the core of the network camera? Let me introduce you to the following.
The network camera can be directly connected to the digital network of TCP/IP, 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.
Image Sensor
The traditional analog camera collects video information through an image sensor, and then directly outputs an analog video signal, which is externally output 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.
Video encoder
Its function is to digitally encode the video signal of CCD according to a certain format, and some of them directly capture the BT of the CCD output. 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.
Network Server
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.
External alarm and control interface
The external alarm and control interface are the auxiliary functions of the network camera, mainly through the serial port or 10 ports. The serial port mode includes RS232 and RS485. The interfaces are auxiliary functions of the network camera, mainly through the serial port or 10 ports. The serial port modes include RS232 and RS485.
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