Comments on Development & Trends of High Speed Dome Cameras
Referring to high speed dome, there are many misunderstandings among most people who simply think “high speed” as the key figure for evaluating high speed dome. However in fact, high speed dome camera often tra...
LPR Camera & Highlight Suppression Camera
LPR cameras are great different with the traditional ones both on software controlling and application, even for the plate number monitoring requiring more professional highlight suppression cameras. The reason lie...
CCTV Basis (Pan/tilt, Housing, Encoder)
Pan/tilt and Housing Pan/tilt is a kind of platform unit holding camera to pan or tilt turning. Inner pan/tilt has two motors, one of which supports pan turning and the other supports tilt turning. Pan turning ang...
There are many types lenses and every type has own features. According to function and structure difference, lens price shows a great range among them. For example, motorized zoom lens is 10 times as expensive as c...
IP protection grade refers to the index for device ability of dustproof and waterproof. This index is mainly used in Europe and Britain goods. IP protection grade is comprised by two digits. The former is the solid...
F-number refers to the ratio of focal length (FL) to lens diameter. Fast lens f-number maybe f/1.4, but f/8 refers to very slow speed. The bigger the f-number is, the slower the lens speed is. Lens system: integrat...
Random interlace is a CCTV system used scanning skill. There-among, two composed fields are non-synchronous. The connected two fields have unstable ties between adjacent lines on time or phase relationship....
2:1 interlace is a term referred in CCTV system. Two fields comprise one frame. For two adjacent fields, lines are scanned alternately with equal interval of time and phase relations.
Interference refers to the outer stray signal which maybe interfere wanted signal.
Intensified silicon target feature lies in that it connects with other intensifiers by optical fiber, so as to enhance sensitivity of SIT tube. Two intensifiers cascading can get as 2000 times sensitivity high as s...
Intensified CCD/ICCD refers to the CCD camera of connecting with electron tube or micro-channel plat type image intensifier.
Infrared radiation refers to a kid of invisible light with over 750nm wavelength (visible red spectrum end) and shorter than microwave length.
Incident light refers to the ray shooting to objects directly.
Impedance refers to the I/O characters of circuit or electronic kit. In order to get optimum signal transmission, cable characteristic impedance must equal to the characteristic impedance of circuit or electronic k...
Image plane refers to the plane which is vertical to ray beam of focused point.
EIA sync signal refers to the signals ordered to ensure scan synchronous in EIA RS-170 (black and white image) standard, RS-170A (color image) standard, RS-312, RS330, RS-420 as well as continued files....
EIA interface refers to a serial standard signal features developed by EIA (Electronic Industries Alliance). EIA interface includes lasting period, waveform, voltage and current.
Echo refers to the returned signal from one or more points in signal transmission process. Comparing with original signals, echo signals have obvious difference in amplitude and period. Echo may be previous or late...
In CCTV monitoring system, dynamic range means the real illumination scope of camera. At such condition, there are highlights region and shadow region, and all details are clear. The quantity is measured by the vol...
Drive pulse refers to sync pulse and blanking pulse.
Bar generator is kind of device generated dot bar video. Bar generator is mainly used for measuring linear and geometric scan distortion of camera and monitor.
Optical distortion refers to the incorrect image of objects. Distortion involves many types.
Diopter is a technical term expressing optical power of lens. Diopter equals the reciprocal of meter measured focal value. For instance, focal length is 25cm (0.25cm), that is to say lens has 4 diopters....
Differential phase means when 3.58-Mhz color subcarrier image signal turns from blanking level to white level, the changes of whole circuit color subcarrier phase.
Electronic focusing refers to that in electron-lens system, one or more elements load static potential energy as to focus cathode-ray beam into point.
Differential gain refer to a kind of change of whole circuit accompanying that 3.58-Mhz color subcarrier signal turns from blanking level to white level. Differential gain is usually expressed by dB or percentage....
Lumen is the expression unit of luminous flux. Lumen equals the luminous flux of candle light shining over a spherical area. As the luminous unit, lumen also equals the surface flux which crosses all points equidis...
NTSC color TV set involves spot illumination or the signals related.
Low light level/LLL camera refers to the CCTV cameras working wonderfully in night or other low illumination conditions.
Magnification refers to the measurement discrepancy digits between actual object size and its image size. Usually 1inch lens and 1inch sensor is the reference for focal length (magnification=M=1). 2inches focal len...
Low-frequency distortion refers to the distortion appeared in low-frequency environment. In CCTV monitoring system, it means frequency below15.75KHz.
Loss refers to the reduction of signal PWL or signal intensity. Loss is usually expressed by dB (decibel). Besides, loss means unnecessary power consumption.
Load refers to the unit for loading energy putout from equipment.
As a glossary, line pairs are used to define TV definition. A TV line is composed by one black line and one white line. 525 lines NTSC image involves 485 line pairs.
Line amplifier is used to drive signal amplifier of audio & video of cable. Line amplifier is set in the middle position of main cable, which is used for reducing loss of amplifier (most as broadband type)....
Resolution measurement method is usually displayed with distinguishable TV lines of image.
Light refers to a kind of electric radiation wave with range from 400nm wave length (blue color) and 750nm (red color).
F-number refers to the ratio of focal length (FL) to lens diameter. Fast lens f-number maybe f/1.4, but f/8 refers to very slow speed. The bigger the f-number is, the slower the lens speed is. Lens system: integrat...
The transparent ability of lens
Fresnel lens refers to the lenses incised into narrow ring pattern and polished. There are concentric circle loops or trapezia loops which can centralize all directions light and image them.
Leading profile is the main part for pulse rising. Leading profile locates in 10-90% of total amplitude.
Laser (Light amplification by stimulated emission of radiation) belongs to the optical resonator. There is flat mirror or spherical mirror at two ends, and having optical amplifier in the middle part. Laser sends c...
Lag means in TV kinescope, two or more images persistence of vision after removing excitation.
Jitter refers to signal instability caused by mechanical interference, power voltage or components quality change. Signal instability maybe from amplitude or phase position, or from both of them.
Isolation amplifier actually is the input circuit and output circuit which are designed especially and avoid affecting each other.
Camera is used for monitoring spot objects. Camera is consisted of CCD sensor (core part), external sync signal circuit, video signal processor and power supply. In recent years, MOS sensor has a great development ...
Lens has a fixed view. This field angle with fixed height and width is the so called viewing angle. Viewing angle is affected by f (focal length) and target surface size h/v (horizontal size and vertical dimension)...
In order to control luminous flux of lens, it is common to add a diaphragm (or called aperture). Assuming d stands for the effective aperture of diaphragm, D stands for actual effective aperture affected by refract...
Lens can be 25.4mm (1 inch), 16.9mm (2/3inch), 12.7mm (1/2inch), 8.47mm (1/3inch) and 6.35mm (1/4inch). Different lenses meet different image dimensions, and we should ensure accordance between image dimension and ...
DC driver (DD) refers to adding a driving circuit of airs motor within camera. DC driver can directly putout DC controlled voltage to and drive aris motor. Therefore, DC driving camera cost may be higher a little (...
Video driver (VD) means that camera putout video signal PWL to the inner lens, then driving circuit putout control voltage, thus aperture adjust operation of electric motor.
Modern mobile communication and personal communication demand audio function developing to multimedia function. In other word, communication supports audio, word, data, graphics, video and suchlike multimedia, maki...
RealVideo （RA、RAM）format adopts for video streaming since generation, or is considered as the creator of video streaming skill. RealVideo can be continuously played with 56K MODEM dialup. Of course its image ...
Quick Time (MOV) format generates from Apple Inc. in long period time, Quick Time format is only used on MAC device of Apple Inc. latter it is gradually adopted in WINDOWS platform. Actually speaking, it is a good ...
N AVI (new AVI) is created from Microsoft ASF algorithm of compression (no relation with AVI). N AVI improves the insufficiency of ASF format, making N AVI having higher frame rate. Of course it loses ASF streaming...
ASF (Advanced Streaming format) is a kind of video compression format used on network. Because of adopting MPEG4 algorithm, compressibility and image quality are relative good. As a video stream format used on netw...
Video signal noise refers to the numerical value of 20log multiplies the ratio between video signal intensity and noise signal intensity. The two parameters create at the same time and can not be separated. Noise s...
Video overlay refers to a kind of ability for computer graphics to be overlaid on real-time signal or video signal and then saved video to HDD.
Signal-to-noise ratio (SNR) refers to the ratio between max fidelity output of db based signal and inevitable electronic noise. The ratio bigger the better quality is. When ratio is under 75db, noise maybe heard in...
Video refers to visible or image information. Convert moveable or immoveable image into electric signal. For computer video, most kinds of electric signals (red, green, blue signal as well as sync signal) are separ...
Video refers to visible or image information. Convert moveable or immoveable image into electric signal. For computer video, most kinds of electric signals (red, green, blue signal as well as sync signal) are separ...
Drawing the whole frame on screen
By drawing vertical frequency to draw frame. For example, NTSC broadcast plays with 30f, but actually it is composed by 60 vertical frequencies.
Standard video input offers standard video input port (RCA). As outputting, standard video signal need encoding, compressing and outputting signal, even need decoding when receives. Thus some signals must lose....
For an image, the visual component is saved separately with audio component, which ensures applications of video and audio by standalone. Talked to audio and visual component, visual component is also called image ...
With S-video input port, S-video signal need not encode and decode, so signal can not lose, S-video signal is better in quality than standard video signal.
SQCIF is popular, standardized image format. SQCIF＝128×96 pixels.
Source video device is applied for playing non-digital video. Source video device includes VCR, disc player, VCD player and camcorder.
Source video refers to the original image visited by digital image editing & compressing program. Non-digital original image should firstly be captured by digital format. Original image can be video tape, CD/ D...
As the essential operation for image figure, softening can be completed during image capturing process. Softening can remove image blocking effect at object edge to improve intensive low-speed capture after image c...
QSIF (Quarter-size Standard Image Format) image has only 25% size of SIF image, BTSC format with 176＊112 pixels; PAL format with 176＊144 pixels. MPEG-1 compression standard supports QSIF image size....
QCIF is a popular, standard image formant. H.323 protocol group defines standard capture resolution for video capture device. QCIF = 176×144 pixels
Standard Image Format, NTSC format with 350＊240 pixels; PAL format with 352＊288 pixels. MPEG-1 compression standard supports SIF image size.
What to Know before You Choose Surveillance System
In this age of heightened awareness of security needs, video surveillance systems offer extra pairs of eyes to help you mange your business more carefully. Before starting to compare surveillance systems or evalua...
Cameras design and procurement guide
This Guide can help monitor the implementation of projects. According to all solutions based on the parameters of cameras, the application environment and the place, it will help you to choose the best cameras, to ...
The Selection of Platform (Pan / Tilt)
The platform can simply be understood as an all-round (horizontal 360 °, 90 ° vertical) base with free rotation. The platform expands the vision of camera. In television monitoring system, the places needin...
Image Sensor Market Review and Forecast
A Rising Tide Raises Both CCD and CMOS Image Sensor Markets The battle between CCD and CMOS image sensors is cooling down, as each technology grows with their respective applications. While CMOS sensors have been ...
CCD Camera Functions and Performance Indicators
CCD camera common functions and the major performance indicators include: the resolution, the lowest light, the signal-to-noise ratio, AGC, back light compensation, electronic shutter, White balance, and synchronou...
Specification Introduction of Zoom-Camera Technology
Zoom camera means cameras and lens are combined into one body, it is convenient to control the camera (multiples, focusing, and iris), indicator: resolution, optical zoom, the minimum illumination, etc. 1. Resolu...
The PARAM: AGC ON/OFF, ATW ON/OFF, ALC/ELC, BLC ON/OFF, LL/INT, VIDEO/DC, SOFT/SHARP, FLICKERLESS The cameras are used to take the pictures of the monitoring areas and convert them into the signal, according to th...
If the camera is a human eye, the lens can be compared to eyeball; it is directly related to overseeing the proximity, scope and effectiveness of objects. The selection should be considered the following points: ...
The Difference between CCD and CMOS
1970 is a landmark year for image processing industry; the United States Bell Labs invented the CCD. After 20 years, people use it to create the digital cameras; image-processing industries are pushed into a new fi...
The Classification of CCD Cameras and Surveillance Cameras
In the security surveillance system, the image is made by mainly CCD cameras. CCD can convert the light into electrons and storage or transfer them, the electrons also can be taken out to make the change of the vol...
According to the types of lens, lens can be divided into such kinds as the wide-angle lenses, the standard lenses, telephoto lenses, the zoom lens and the pinhole lenses. According to the size of objects, the rela...
The camera is the core in the whole monitoring system. You can choose them according to the modes and locations of installation, environmental lights, image clarity or other specifications. The camera is the core ...
How to Install and Adjust the CCTV Cameras?
The use of cameras is very easy, before it works, we should install the lens correctly, adjusting lens aperture, focus, and back focus, connect the signal cable and put through the power resource. But in the real...
How Does the Cameras Auto Focus?
When the camera focused properly, the details of the image became clear; Images of the lines or the contours of objects become sharp. When the camera focused very clearly, the details of the image becomes clear. T...
CCTV Security Camera Information for Non-Technical People
Get a good face shot Use Higher quality cameras at entry areas Doors, gates and other entry areas need a good quality, high resolution camera to record a good 'face shot.' The video from this camera should be cons...
Digital cameras have become extremely common as the prices have come down. One of the drivers behind the falling prices has been the introduction of CMOS image sensors. CMOS sensors are much less expensive to manuf...
How Different is between C-Mount Lens and CS-Mount Lens?
Lens can be divided into C-Mount Lens and CS-Mount Lens. C-Mount Lens The flange back (distance from the surface where the lens comes in contact with the camera to the focal point) of C-Mount lens is 17.526mm (0....
In most surveillance operations using a DVR, the commonly used method is to link the DVR card to a computer containing the software. This has serious limitations in the event of a virus attack or power failure, bec...
DVR Introduction digital video recorder Digital Video Recording (DVR) Features DVRs you will have the ability to: A (DVR) is basically just a computer hard drive that is encased in a box that is made to look like ...
The PC-based DVR is recording equipment combined into a PC. It carries all the features of a PC as well as additional features of a DVR. With many models in the market, here’s how you can select a PC-based DVR, w...
CMOS (Complementary Metal-Oxide Semiconductor) is the sensitimeter of camera. The manufacture skill of CMOS is similar to common chips. They are both semiconductors made by silicon and germanium. CMOS stores negati...
MPEG-4 has much difference with MPEG-1 or MPEG-2. As a compression algorithm, MPEG-4 is also a international standard that meets demands of integration and compression skills such as digital television, interactive...
PAL (Phase Alteration Line) is I adopted in most Europe countries, Australia and some middle-south America countries for commercial TV broadcast. PAL format speed is 25fps (25 Hz) and resolution is 625 lines (horiz...
NTSC / NTSCNTSC (National Television Systems Committee NTSC) is a kind of video standard. NTSC is adopted in America, Canada, Japan, and some middle-south America countries for commercial TV broadcast. NTSC format ...
MPEG image encoding includes three factors: I frame, P frame, B frame. During MPEG encoding process, some images are compressed to I frame, some compressed to P frame, and rest compressed to B frame. I frame compre...
Fps (frame per second) detection is applied for storing and showing signal quantity of dynamic video. Fps is also a film word or digital video word. As we know, single frame is motionless picture, but continuous di...
Div X refers to digital video CODEC (encoder & decoder) which is based on MPEG-4 skill. Div X format can compress big file into so small file as to can be transmitted on the Internet, thus meeting actual demands of...
