SONY auto focus camera module output image and video, it must be connected to the display device through the video interface, different periods of video interface requirements are different, the output mode is also different, today we will learn about the classification of video interface.
CVBS (Chinese name: Compound Synchronous video broadcast signal) is the earliest video signal output standard, one of the earliest video display output specifications, to be precise, the first generation of video display output mode (the second generation is S-VIDEO, the third generation is VGA, the fourth generation is DVI, the fifth generation is HDMI).
Standard Video Input (RCA) interface:
Also known as AV interface, are pairs of white audio interface and yellow video interface, it uses RCA(commonly known as lotus head) for connection, use only need to connect the standard AV cable with the lotus head and the corresponding interface can be connected. RCA connector is by far the most common kind of audio/video terminal. RCA audio terminals are usually color-coded in pairs: red for the right channel and black or white for the left channel. Generally speaking, RCA stereo audio lines are left and right channels for a group, each channel appearance is a wire. There are usually pairs of audio interfaces right channel (red) left channel (white) and video interface (yellow).
AV interface Composite video interface:
Also called AV interface or Video interface, is the most common video interface, almost all TV, DVD player products have this interface. AV Composite video interface, an analog interface, is a video interface that separates audio and video. Generally, it is composed of three independent RCA plugs (also known as the club interface and RCA interface) in yellow, white and red channels. The V interface is connected to the mixed video signal, which is the yellow port; L interface is connected to the left channel sound signal, which is a white socket; The R interface is connected to the right channel sound signal, which is the red port. Since the video signal does not contain the accompanying sound, the Audio input and output ports (Audio In and Audio Out) are generally matched with the video input and output ports, so as to synchronize the transmission of accompanying sound. Therefore, sometimes the composite Video interface is also called AV (Audio Video) port.
S-video (s terminal, mini-DIN) :
The s terminal is also a common terminal, which separates the transmission of brightness and chroma, avoiding the mutual interference of brightness and chroma during the transmission of mixed video signals. The S terminal is actually a five-core interface, which consists of five core wires: two video brightness signals, two video chroma signals and one public shielded ground wire. It is used to separate the brightness and chroma output device. This design is mainly for the mutual interference of brightness and chroma in the composite output of video programs. It is used to separate the brightness and chroma output device. This design is mainly for the mutual interference of brightness and chroma in the composite output of video programs.
The signal of S-video generally uses the 4-pin mini-DIN connection terminal, and the terminal impedance must be 75 ohms. The S terminal is also known as the mini-DIN interface in the name of some projector manufacturers. Including 4 cores (no sound output), 5 cores, 6 cores, 7 cores, 8 cores, 9 cores (can provide 6 channels of signal output) and other different products are used in the projector.
Component (video interface) :
Component video interface is also called color output/input interface, also called 3RCA. Component video interfaces usually use YPbPr and YCbCr identifiers. Component video interface/color terminal is on the basis of S terminal, the color (C) signal in the blue difference (b), red difference (r) separately sent, its resolution can reach more than 600 lines, can input a variety of levels of signals, from the most basic 480i to the frequency double scanning 480P, even 720P, 1080i and so on. For example, the YPbPr interface on the graphics card uses 9-pin S terminal (mini-DIN) and then transmits it independently through the color difference output line.
BNC (coaxial cable card ring interface) :
The cable has five connectors for receiving red, green, blue, horizontal and vertical synchronization signals. BNC connector is a special display interface that is different from the standard 15-pin D-SUB connector. It is composed of R, G and B primary color signals and five independent signal connectors for line synchronization and field synchronization. It is mainly used to connect workstations and other systems that require high scanning frequency. BNC connector can isolate video input signals, reduce the interference between signals, and the signal bandwidth is larger than ordinary D-SUB, can achieve the best signal response effect. BNC connector can reduce the interference between video signals and achieve the best signal response effect. In addition, due to the special design of BNC interface, the connection is very tight, and there is no need to worry about poor contact caused by loose interface.
VGA (Chinese name: Video graphics array) :
A video display output standard proposed by IBM. The VGA interface has a total of 15 pins divided into 3 rows with 5 holes in each row. It transmits red, green, and blue analog signals as well as synchronous signals (horizontal and vertical signals). The most widely used type of graphics card. The computer uses this interface as the standard output interface.
VGA input interface: VGA interface adopts asymmetric distribution of 15pin connection mode, its working principle: It is to make the image (frame) signal stored in digital format in RAMDAC through analog modulation into analog high frequency signal, and then output to plasma imaging, so that the VGA signal in the input (LED display), do not have to go through the matrix decoding circuit conversion like other video signals. It can be seen from the previous video imaging principle that the video transmission process of VGA is the shortest, so the VGA interface has many advantages, such as no crosstalk and no circuit synthesis separation loss.
DVI (Chinese name: Digital Video Interface) :
Interface standard developed by DDWG Digital Display Working Group composed of several companies. A digital video interface technology. There are three different interface forms: DVI-A, DVI-I, and DVI-D. DVI input interface: DVI interface is mainly used to connect with the computer graphics card with digital display output function to display the RGB signal of the computer. The DVI digital terminal is better than the standard VGA terminal signal, the digital interface ensures that all the content is transmitted in digital format, and ensures the integrity of the data in the transmission process from the host to the monitor (no interference signal is introduced), and can get a clearer image.
HDMI (High Definition Multimedia Interface) :
Compared with DVI interface, HDMI supports audio output and has a higher bandwidth. It can be regarded as the most mainstream video output interface at present. As the interface becomes smaller, it is also widely used in TV, monitor, laptop and other devices. HDMI interface, although not as loaded as DVI in specification, has a different form. It can be regarded as the reinforcement and extension of DVI, and the two can be compatible. HDMI can transmit uncompressed high-resolution video and multi-channel audio data in digital form while maintaining high quality, with a maximum data transfer speed of 5Gbps. At the same time, the extra space provided by the HDMI standard can be used in future upgraded audio and video formats. HDMI is smaller than DVI and can transmit both audio and video signals.
SDI (Digital Component Serial Interface) :
SDI is the abbreviation of Serial Digital Interface. It is a kind of broadcast grade high-definition digital input and output port, which is often used in the camera interface of broadcast TV. The transmission rate of SDI interface is limited to 2.97Gbps. Using a single copper shaft for signal transmission, wiring construction is very convenient, transmission distance up to 300 meters, in the original field of radio and television and security very popular.
DP (DisplayPort) :
DP interface is standard in almost all current displays, which can be regarded as an upgraded version of HDMI interface, but the internal data transmission mode is completely different from DVI and HDMI, with higher bandwidth. Thanks to its good performance and advanced technology, DP interface has gradually become an essential interface for high-end displays.
DisplayPort supports both external and built-in display connections. VESA wants notebook manufacturers to use DisplayPort not only to connect to individual displays, but also to connect directly to LCDS and motherboards, making it easier to upgrade notebooks. For this reason, the DisplayPort interface is also designed to be very small, which is convenient for notebook use and allows the graphics card to configure multiple interfaces.
The Camera link standard specifies the interface between a digital camera and an image acquisition card, using a unified definition of physical connectors and cables. Camera link includes three specifications: Base,Medium and Full. Camera Link Base uses four data channels, Medium uses eight data channels, and Full uses 12 data channels. If the maximum rate of the Camera link interface is 85MHz, the effective bandwidth of Base is 2Gbps,Medium is 4Gbps, and Full is 5.3Gbps. Recently, Camera link has added a new specification Camera link Full+, supporting 80MHz, transmitting 80bit data, bandwidth up to 6.4Gbps.
HS-LINK interface is defined by DALSA Company. It supports higher speed transmission bandwidth. A single cable is 4 times that of Camera Link. Also known as Camera Link-HS. The maximum transmission bandwidth of Camera Link-HS can reach 12Gpbs.
CoaXPress This standard allows camera devices to transmit data at speeds of up to 6.25 Gbit/s through a single coaxial cable connected to the host computer, and up to 25 Gbit/s through four cables. The adoption of standard coaxial cable and bandwidth makes CoaXPress not only of interest in machine vision applications, but also suitable for applications in the medical and security markets where coaxial cable is widely used.
IEEE 1394, also known as Firewire or iLink, is capable of transmitting digital video and audio and machine control signals with high bandwidth and stability. Usually it is mainly used to connect digital video cameras, DVD recorders and other devices. There are two types of IEEE 1394 interfaces: 6-pin hexagonal interfaces and 4-pin small quadragon interfaces. The six-pin hexagonal interface can supply power to the connected device, while the four-pin quadragon interface cannot.