Although the application of CCTV security have not changed much in recent years, instruments and equipment have significantly. Cameras became smaller, cheaper and better, but the major breakthrough happened in recording equipment.
So many customers shopping for complete CCTV monitoring and recording systems are confused by such a truth of available products. The aim of this article is to guide buyers toward best possible and most economical type of CCTVequipment, based on intended implementation and requirements.
Selecting the right cameras.
It 'almost impossible to describe all types of those available in this short article. We will focus our attention and widely used types of camera and more popular, however.
CCTV security cameras produce images using CMOS or CCD (Charge Couple Device) chip. Tiny, very low price CCTV cameras usually use CMOS technology, the production of poor qualitythe pictures are very poor and sensitivity to light. Decent quality CCTV cameras use CCD technology. The size of the CCD chip is normally 1 / 4 ", 1 / 3" or 1 / 2. "As a general rule, the larger the size, the higher the image quality produced and the higher the price. However, the greater density 1 / 4 "and 1 / 3" CCD capable of producing as good an image as many 1 / 3 "or 1 / 2" chips.
The number of TV lines in the image security camera is a measure of image resolution (sharpness). L 'The greater the number of TV lines, the better the resolution and, therefore, the overall image quality. Standard resolution camera may have 350-380 lines, over 400 TV lines is generally considered good resolution while over 500 TV lines is considered high resolution. B / W chip cameras produce greater resolution and better light sensitivity, therefore suitable for use in dark areas where light conditions are poor most of the time.
On the other hand color cameras offer morerealistic and natural. CCTV cameras are usually divided into different types according to the camera body used.
professional grade cameras.
They dump type with the possibility of using different types and sizes of the lenses. Exchangeable lenses enable the camera to track objects from any distance. Although for indoor use, can be used for outdoor when combined with weatherproof housing. They areconsidered the most flexible and widely used by professionals for commercial installations.
Bullet cameras.
Bullet cameras are, as the name suggest contained inside bullet-shaped container.
Most cameras are bullet resistant and sealed without the ability to use different lenses. great advantage of bullet camera is the size and integrated design of small, some bullet cameras will also have infrared LED future built-in. The infrared technology is simply LED in the infrared spectrum (not visible to the human eye). This light goes on display area, making it possible to monitor in total darkness. This is great future, but it only works up to certain distance (usually between 10 and 50 feet depending on model) Vary simple to install and estheticly designed, bullet cameras are ideal for do-it-yourself and residential installations when monitoring objects are within about 25 feet from > Position the camera (with standard 3.6 mm lens).
Board Cameras.
Board Cameras are basically fixed lens mounted on a circuit. These cameras can be packed in a suitcase (Mini Cameras) or dome (Mini Dome) or simply sold unpackaged, for mounting by the buyer. Lenses these are both normal industry aperture or a pinhole "lens "the very small opening. Pinhole lensCameras> are often called "spy" cameras and can be mounted in a hidden way for covert surveillance. The most popular examples of those on board are smoke detectors and hidden cameras motion detector.
Since the lenses of the cameras on board are pre-assembled, have a fixed iris and are usually a short focal length (wide), their flexibility of usefulness is limited. However, this type of camera can provide a low costsolution in the right situation, especially in a home environment. We have briefly described the most common types of cameras, now lets discus, how and where mite be used.
professionals with C / CS mount lens attachment generally offer best performance and many important futures, like lens control output, Back Light Compensation and more ...
Distance from monitoring object to the camera is not a problem, which is why the ability to selectdifferent lenses, depending on the position is so important. The installation is quite complicated and professional installation strongly recommended. We recommend this type of security cameras for commercial installations.
Most Bullet cameras in comparison, do not offer high resolution and lens selection flexibility, but are likely to be weatherproof, some will have built-in infrared light and, especially, are relatively easy to implement. They usually come with3.6 mm lens witch are considered suitable for most standard installations (good for covering small to medium size room or equivalent).
For larger rooms or long distances, cameras with 6mm or higher lens may be required. They are the ideal choice for any do-it-yourself installation.
Board cameras in contrast are widely used in covert camera installations, sometimes called Spy Cameras. Many of those are basically edge with built-intransmitter. We have no intention of going wireless cameras right now, as this would be enough material for completely new article.
Board cameras are sold as a normal circuit, for integrating into hidden camera devices. Are also available in dome housing, as vary popular Dome Camera or integrated with Smoke Detector, Motion Detector, Exit Sign and so on. Most also come with 3.6mm lens although some will bereplaced.
Over time, more practical design has been Dome Camera with its esthetic appearance it blends into the landscape, particularly with holding down, ideal for use in stores, lobbies, gas stations and other public places. Practical solution for covert installation are also, Motion and Smoke Detector cameras, they are absolutely not a substitute for the security alarm or fire protection. They should always be selected based on the position of the camera(Internal / external), distance from the object of monitoring, lighting conditions and budget.
When shopping for security cameras, customers are faced with the fact that you must select one or another recording device.
The days of well-known CCTV time-lapse video recorder is almost over.
Although some people still prefer this style of old recording solution, it is worthwhile to invest more money to buy a good quality digital video recorder (DVR). Digitalrecorder transfers analog camera feeds into digital format and stores it on your hard drive. There are two main types of digital recorders on the market at this time.
PC-based systems.
A special board and software installed on your computer allows camera inputs and store video on hard disk.
Many people are under the misconception that personal computer with additional hardware installed, will do the job. This explains the hundreds ofcompanies that have hung a sign, removed some ads and begun working out of basements and garages, holding out DVR manufacturers and safety specialists. The main problem with this type of CCTV recorders lies in the main component of it ... Yes, it is a computer designed to do unlimited tasks, but not well. The truth is that any computer based digital video recorder is, and will always be vulnerable to software crashes, hang-ups, system instability, virus related problemsetc. ..
Stand alone.
Very similar in appearance and control functions to standard VCR recorders, are truly remarkable devices. Most video processing is done by hardware, therefore eliminating system crashes, video is also stored on the hard disk in digital format. The base operating system, usually Linux, is permanently stored on special processor, witch is possible to overwrite or corrupt. Designed and manufactured with one question in mind, ismuch better in terms of performance and reliability to its PC based rival.
Some DVR systems also have remote monitoring capability, useful when monitoring is required in different locations through Internet or network connection. Most important futures to look for in choosing the right DVR recorder are motion detection and frame rate. The higher the frame rate and more fluent video recording. Motion detection allows recording video from each camera only when motion is detected, this isIdeal for extending video recording time.
Security Monitor.
Video from Security recorder could be displayed on regular TV monitor. All right, do it this way, for the monitoring of the child or the residential application, when the image quality is not so important. However, professional installation, monitor security cameras are very important. They offer a longer life of the cathode ray tube (necessary with any static image, which can cause burnout photo)much grater resolution.
Cables and wiring.
Finally any camera installation requires wiring is correct. high quality cable to prevent video degradation over long distances. It is recommended to use RG59 or RG6 coaxial cable as it is fully shielded to prevent video loss up to 400 feet coaxial cables will require BNC connectors and proper installation possibly done by experienced technicians. In short runs plug and play non-coaxial cables withfactory installed BNC connectors can be used (up to 150 feet). The plug and play cables are easy enough to install, not users.
Cables for CCTV cameras consist of two cables supplied with a jacket. One cable for video and one for power delivery.
Conclusion.
Each CCTV system is good and reliable as its weakest component. With this in mind, investing in more cameras and quality performance, while purchasing low performancerecorder, from economical and practical standpoint just does not make sense.
For example, why use CCTV cameras with 500 TV lines of resolution with monitor that offers only 380 or less. All the benefits of high-resolution camera is affectively sacrificed by limited capability of monitor. Asking questions is important before buying a video security system, and the supplier will probably be able to provide further details and recommend equipment for specific needs andrequirements.
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