What is a DVR (digital video recorder)?
DVR (digital video recorder) records by hard disk skill which is different with analog video skill of traditional recorder, so it is called Digital Video Recorder or Disk Video Recorder. DVR divides as three kinds: 1.digital STBr Digita
DVR card is a kind of kit on circuit wafer, which includes soft compression and hard compression. Soft compression card makes some capture chips as the core, cooperating with periphery kits to achieve video capturing. Hard compression card captured
What is a Fiber Optic Video Converter?
Fiber optic video converter which assists wired transmission is a kind of equipment converting signals mode between optical and electronic. Fiber optic video converter involves analog type and digital type: Analog Fiber-optic-video-converter Analog
CCD (Charge Coupled Device) is made by semiconductor material of super photosensitivity. CCD can convert luminous flux into electron, and then electric signal is converted into digital signal. Finally, digital signal is transmitted to PC by USB inter
In CCTV system, bracket is applied for supporting camera and pan tilt. If camera only monitors some fixed place, common bracket is competent enough. Simple installation, low price and various kinds are the advantages of common bracket. Common bracke
What is a Low Illumination Camera?
Low illumination camera which can work in weak light condition is a kind of CCTV camera, involving moon type, star type and IR type. Such high sensitivity cameras as moon grade and star grade can normal work in tiny light condition and 1~3lux is the
CCD (charge couple device) is a semiconductor-made kit, so it shows up high sensitivity, anti highlight, small distortion, mini bulk, long expectancy, anti shake etc. CCD camera involves the below kinds: Divided by imaging color 1.Color
CCD (charge couple device) is a semiconductor-made kit, so it shows up high sensitivity, anti highlight, small distortion, mini bulk, long expectancy, anti shake etc. CCD camera involves the below kinds: Divided by imaging color 1.Color
Aperture which is a kind of optical iris is inside of lens and adjustable. Aperture can control luminous flux of crossing lens. Aperture involves manual aperture and auto aperture: (1) Manual aperture: when brightness changed, it must b
Housing is the important component in CCTV system. It ensure camera normally work under poor conditions like dusty, rainy and temperature of high or low. There are two kinds of housings. The one is indoor housing, which has simple structure and low
Lens is a kind of optical clarity kit made by one or more optical glasses spherical. It is applied for focalizing or scattering light from targets, so as to form real image or virtual image. There are many kinds of lenses. According to focus, lens ca
Zoom camera is an optical system that the position of focal surface is fixed but focal length adjustable. Zooming is finished by moving glass-chip inside of lens as to change glass-chip positions. By such way, it is manageable to adjust focus length
Monitor is the standard device of video out, which is essential for us to browse image from camera. Monitors can be color or B/W(black/white), and dimensions can be 9”、10”、12”、14”、15”、17” and 21” ,but 21&
In the multi-camera surveillance system, it is usually found that multiple pictures show on one monitor together. When adopted, multiplexers can make monitors which are as the same as multiplexers in number, display signal of all channels on one moni
In the multi-camera surveillance system, it is usually found that multiple pictures show on one monitor together. When adopted, quads processors can make monitors which are as the same as quads processors in number, display signal of all channels on
During CCTV system, the quantity proportion between camera and monitor ranges from 2:1 to 5:1. In order to make fewer monitors support more cameras, it is necessary for video switcher to distribute some channel signal to certain monitor, which is als
We often hear of pan tilt, but most people are unfamiliar to it. Actually, pan tilt is an installing plat composed by two motors which can pan or tilt moving. Pan tilt a supporting device used to install and fix camera. Different with the pan tilt of
What is an Object Tracking Speed Dome?
Auto-object-tracking-speed-dome integrates features of optics, electronics, mechanism, information processing and network. It is composed by lens, dynamic actuator, movement controller as well as sync speed parts of image analysis, recognition, compr
What is Access Control System?
Access control system is a new management pattern for entrance, that is to say this system allows authorized user but refuses unauthorized person to enter some certain interface. As son as received data, the controller of access control system determ
As transmitter is synchronizing with receiver, signal synchronization must be done. HSYNC (horizontal sync) signal controls horizontal scanning and VSYNC (vertical sync) controls vertical scanning. Sync system involves the three kinds below:
Embedded system means operating system integrates with software into hardware system of PC. Simply speaking, that is software integrates with hardware, which is similar to the work pattern of BIOS. Embedded system has advantages such as little quanti
In the intelligent buildings, information and procession is a very heavy task. So managements are usually finished by PC system. In other words, user programs in software to achieve keyboard controlling of pan tilt scanning, image switching, alarm pr
This kind of detector usually adopts Bi-directional Pulse Notation pattern, that is to say alarm happens in coming direction but doesn’t happen in going direction. The detector can recognize invade direction. When user enters from inner area to
Super Hole Accumulation Diode (HAD) is embedded in CCD senor. So it is helpful to enhance detecting ability and signal processing ability, even can decrease noise and interference as recording. In this way, image will be clearer and color will be mor
In long distance transmission, it is necessary for well transmitting to adopt thick cable as well as video amplifier in order to strengthen signal. Video amplifier can strengthen brightness, chromaticity and sync signal, however, interfering signal i
Video distributor which is adopted to distribute channel signals is often found in video transmitting process. It serves as distributing one channel into multiple channels. The common found distributors are 2 way tap, 3 way tap, 4 way tap, and 6 way
Video server is a dedicated PC device which serves AV (audio& video) of compressing, storing and processing. Video server is widely applied for video surveillance, network education, video conference, spot announcement and VOD (video on demand).
What is Communication Interface?
In CCTV system, communicating interface is mainly applied in AV (audio& video) input-output process. So there are these kinds: ○1RS-232, RS-485 and general interface of network, ○2USB2.0 interface of supporting PSTN, ISDN and LAN, ○3interface of
Focal length is a parameter for all optic devices. Speaking by optics theory, focal length means the distance from focus point to lens centre. Focal length is significant for camera lens. Focal length and image size is in direct-ratio, the longer the
As a unit of brightness, illumination means camera’s requirement for brightness of surrounding area. The unit of illumination is Lux. 1Lux nearly equals to illumination of 1m distance of 1 candle. The “MINIMUM.ILLUMINATION” which is
Lux is one of the ISI (international system of units). The using of Lux involves one length unit----meter. 1Lux =1 lumen/ m2.
