Although the use of CCTV security have not changed much in recent years, instruments and equipment have significantly. Cameras are smaller, cheaper and better quality, but the turning point came in recording equipment.
Therefore many customers shopping for complete CCTV monitoring and survey systems are confused by the truth of available products. The purpose of this article is to guide shoppers to type better and cheaper than CCTV equipmentimplementation schedule and requirements.
Selecting the right cameras.
It 's almost impossible to make all forms available to children described in this short article. We will focus our attention on the most popular and widely used camera types instead.
CCTV security cameras produce images using CMOS or CCD (Charge Couple Device) chips. Thumbelina, a very low price CCTV cameras usually use CMOS technology, produce poor quality images and is very bad lightsensitivity. Decent quality CCTV cameras use CCD technology. The size of the CCD chip is normally 1 / 4 ", 1 / 3" or 1 / 2 ". As a rule of thumb, the larger size, the higher the image quality produced and the highest price. But it can a high concentration of fourth and 1 / 3 "CCD now produce good image as many 1 / 3" or 1 / 2 "chips.
The number of TV lines in the image of the security camera is a measure of image resolution (sharpness). The higher the number of TV lines, the betterThe resolution and thus 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 a high resolution. Chip B & W offers higher resolution and better light sensitivity, therefore suitable for use in dark areas where light conditions are poor, most of the time.
In other hand color cameras offer more realistic and natural picture. CCTV cameras are usuallydivided into different types according to the camera body.
Professional quality cameras.
Type box with the power of different lens types and size to use. swap lenses for this camera, display objects from any distance. Even for internal use, may be used externally with weatherproof housing. E ', considered the most flexible and widely used by professionals for professionalsplants.
Bullet cameras.
Bullet cameras are, as the name suggestions in the form of housing sphere.
Most bullet cameras are weatherproof and sealed without the ability to use different lenses. great advantage of bullet camera is the small size and integrated design, a bullet infrared cameras will also be the future is built. LED technology is the only infrared light in the infrared spectrum (not visible to human eye). The lightinformed viewing area, which can be controlled in complete darkness. This is a great future, but only works for a given distance (usually between 10 and 50 feet, depending on model) vary easy to install and estheticly design, bullet cameras are excellent choices for residential security installations and do- it-yourself when objects are about 25 feet from the camera position (with standard 3.6 mm lens).
Board camera.
Council, it is essentialpermanently mounted on a PCB. These cameras can be packed into a small box (Mini) or dome (Mini Dome) or simply sold unpackaged, for confirmation of the buyer. The objectives in this part of a normal opening of the sector or a "pinhole lens of a very small opening. Pinhole lens cameras are often called" spy "cameras and may be surreptitiously installed covert surveillance purposes. The best known examples of smoke and children aboard secret motion detectorcameras.
Since the lenses in board cameras are pre-assembled, have a fixed iris and is normally a short focal length (ie wide angle), their usefulness limited flexibility. But this type of camera can provide an economical solution in the law, especially in a home environment. We described briefly the most common types of cameras can now discuss how and where he used mites.
professional types with C / CS lens provides links throughoutbest performance and many important futures, like lens control output, Back Light Compensation and more …
Distance from the camera control is not a problem, you can then choose different objectives, based on location is so important. The installation is quite complicated and professional installation strongly recommended. We recommend this type of security programs for commercial facilities.
Most bullet cameras in comparison, is not high resolutionand the flexibility to select targets, but probably the time of infrared light has a built-in and, especially, are relatively easy to implement. They usually come with 3.6 mm lens witch are considered suitable for most standard installations (good to cover small and medium-sized room or equivalent).
For larger rooms or longer distances, cameras with 6mm or higher lens may require. They are good options for do-it-yourself installation.
Board camerasOn the contrary, widely used in covert camera installations, sometimes spy. Many of them are essentially children's table with built-in transmitter. We do not intend to go into wireless cameras right now, because it would be enough material for the full news article.
Council will be sold as a normal circuit for integration into hidden camera devices. Are also available in dome housing, such as exchange of popular Dome Camera or integrated with Smoke Motion DetectorDetectors, exit and so on. Most also come with 3.6 mm lens although some will allow the replacement of the lens.
Over time, the design was the most practical Dome Camera with its esthetic appearance of the area, it goes down particularly sealing, ideal for use in stores, lobbies, gas stations and other public places. practical solution to the mystery plant is also proposed and smoke detector cameras, are not a substitute for your own safety or warningfire. They must always be chosen based on the location of the camera (inside / outside), distance from subject to monitoring, lighting conditions and budget.
When the security cameras, customers are faced with the fact that they must choose one or another recording device.
The days of the famous video recorder time lapse CCTV has almost disappeared.
Although some users still prefer the old fashioned recording solution, it is worth investingbit 'of extra money, good to buy a digital video recorder (DVR) reference. transfer of digital video work in digital format and save it to disk. There are two main types of digital recorders on the market today.
Based systems.
A special board and software installed on your computer will allow camera inputs and store video on hard disk.
Many people are under illusion that the personal computer with additional hardware installed, will do the job. This explains the hundreds of companies which hangs a sign, removed some ads and start working from basements and garages, holding themselves and safety specialists DVR manufacturers. The biggest problem with this type of CCTV recorders lies in the principal … Yes, it is a computer designed to perform unlimited, but not well. The truth is that a computer-based> Digital Video Recorder, and will always be vulnerable to software crashes, hang-ups, system instability, virus, etc. .. the problems
Standalone Systems.
Very similar in appearance and control functions for standard VCRs are truly remarkable devices. Most video processing is performed by hardware, therefore eliminating system crashes, video is also stored on disk in digital format. The base operating system, usually Linux, is permanentlystored in a special processor, witch is impossible to write or damaged. Designed and built with a question in mind, is by far the best performance and reliability of its computer-based objectives.
Some DVR systems including remote control capability that is useful in monitoring is required in different locations via the Internet or a network. The future primary way to control the choice of the right DVR recorder are motion detection and frame rate. The higher the frame ratesmoother video recording. Motion video capture will allow each camera when motion is detected, is an extension of time of video recording.
Security screens.
Video from Security recorder could be displayed on the TV screen regularly. Okay do it this way, to monitor child or residential application, when the quality of photography is so important. But for professional installation, security monitor asimportant cameras. They offer a longer duration of the cathode ray tube (necessary with a static image, which can cause photos burnout) and much grater resolution.
Cables and wires.
Finally, a camera installation requires proper wiring. high quality cable to prevent video degradation over long distance race. We recommend RG6 or RG59 coaxial cables for use when fully protected and loss of video signal up to 400 meters of coaxial cable occur will require BNCconnections and proper installation possibly done by a technician. In the short term plug and play non-coaxial cables with factory 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 bundled in a jacket offer. One cable for video and one for the power supply.
Conclusion.
Each CCTV system is good and reliable as its weakest link.With this in mind, investing on highest quality and performance cameras, while purchasing low performance recorder, from economical and practical point of view simply does not make sense.
For example, why are cameras with 500 TV lines resolution with a screen with only 380 or less. All the advantages of high resolution camera is affectively sacrificed by limited capability of the screen. Asking questions is important before buying a video security system, and the sellerprobably can provide more information and the best equipment for their specific needs and requirements.
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