Security Camera System - Buyer's Guide
Although the application of CCTV security have not changed much in recent years, the tools and equipment have significantly. Cameras became smaller, cheaper and better, but the big breakthrough happened in recording equipment.
As a result, many customers are shopping for complete CCTV monitoring and recording systems are characterized by such a truth of products available to be confused. The purpose of this article is to guide buyers to the best and most economical type of CCTV,based on intended implementation and requirements.
Choosing the right camera.
It 'almost impossible to describe all kinds of those available in this short article. We will focus our attention on the types of cameras most popular and widely used instead.
CCTV cameras to produce images with a CMOS or CCD (Charge Couple Device) chips. Small, very low price CCTV cameras usually use CMOS technology of low quality and have a very poor light sensitivity. Decent qualityCCTV cameras use CCD technology. The size of the CCD chip is normally 1 / 4 ", 1 / 3" or 1 / 2 ". The general rule, the larger the size, the higher the image quality produced and the higher the price. However, the density highest 1 / 4 "and 1 / 3" CCD image may well now as good 1 / 3 "or 1 / 2" chips.
The number of TV lines security camera image is a measure of image resolution (sharpness). The greater the number of TV lines, the better the resolution and then totalImage 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 is bad most of the time.
In other hand color cameras offer a realistic and natural images. CCTV cameras are usually divided into various types in the bodyThe camera uses.
Professional cameras.
Type body with the ability to use different types and sizes of lenses. Exchangeable lenses enable this camera to track objects from any distance. Although for indoor use, can be used outdoors if weather-resistant housing. They are considered the most flexible and widely used by professionals for commercial installations.
Bullet cameras.
Mini-cameras, as the name suggestscontained within the ball-shaped housing.
Most cameras are weatherproof and sealed ball without the possibility of using different lenses. One of the main advantages of the ball-camera is the small size and integrated design, some cameras have built in infrared LED also the future. Infrared technology is simply LED light in the infrared spectrum (not visible to the human eye). This light is lit visual field, so that surveillance can be in total darkness. This is a great future, but it works only upinstall certain distance (usually 10-50 ft depending on model) Vary simple estheticly designed, bullet cameras are excellent choices for residential and do-it-yourself installations where monitoring objects are within about 25 meters from the position of camera (standard 3.6 mm lens).
Board cameras.
Cameras are basically fixed lens board mounted on a printed circuit board. These cameras may be packaged in a small case (Mini-cameras) or dome (Mini Dome) or simply soldunpackaged, for mounting by the buyer. One of these objectives in an open field or a normal lens "hole" very small aperture. Pinhole lens cameras are often mounted as a "spy" cameras and may be in a hidden way for covert surveillance. The most common examples are those secret board smoke detector and motion detector cameras.
Since the lens board cameras are pre-assembled, have a fixed orifice and are usually of short focal length (ie wide angle),advantage of their flexibility is limited. However, this type of camera is a cost effective solution in the right situation to do, especially in the home. We have briefly described the most common types of cameras that can now drive, how and where they mite be used.
Professional with C / CS lens mount system usually offer the best performance and many important future, as slow release, Compensation and many others ...
Removing the object trackingThe camera is not a problem, then, the ability to use different lenses to choose from in location-based services is so important. The installation is a little 'complicated installations and professional strongly recommended. We recommend this type of surveillance cameras for commercial installations.
Most of the smaller cameras do not provide a comparison in high resolution and lens selection flexibility, but probably are weatherproof, some are equipped with infrared light and, especially, are relatively easy to implement.They are usually equipped with 3.6 mm lens witch are considered for most standard installations (good for covering small and medium-sized rooms or equivalent) suitable.
For larger rooms or long distances, cameras with 6mm or higher lens may be necessary. They are good choice for the do-it-yourself installation.
Board cameras in contrast are widely used in hidden camera installations, sometimes called a spy camera. Many of those who are basically on board with built-in transmitter. We do notgo into wireless cameras right now, because it would be enough material for completely new products.
Board cameras are sold as pure PCB for installation into hidden camera devices. They are also available in dome housing, as several popular Dome Camera or integrated with smoke detectors, motion detectors, Exit Sign and so on. Most also come with 3.6 mm lens although some will be replaced by the lens.
Over time, most practical design has been Dome Camera with its estheticAppearance that blends with its surroundings, especially with drop down sealing, ideal for use in stores, lobbies, gas stations and other public places. Practical solution for covert installation also, motion and smoke detector cameras, are in no way replace your security or fire alarm. You should always be elected to the position of the camera (inside / outside), the distance from the object of monitoring, lighting conditions and budget.
When shopping for safetyCameras, with the fact that customers need to choose one or the other side of the recording device.
The days of well-known CCTV time-lapse VCR recorder are almost over.
Although some customers still prefer this old fashioned recording solution, it is worth investing a little 'more money to buy a good quality digital video recorder (DVR). Digital recorder transfers analog camera video feed into digital format and stores them on disk. There are two main types ofDigital voice recorders on the market at this time.
PC-based systems.
A special board and software installed on your computer, camera input and video stored on your hard drive.
Many people are under the misconception that the personal computer is installed with additional hardware, the job is done. This explains the hundreds of companies that have hung a sign, some ads and got started from basements and garages, holding off the DVR manufacturers andSecurity specialists. The main problem with this type of CCTV recorders lies in the main part of it ... Yes, it is a computer designed to do unlimited tasks, but no good. The truth is that all computer-based digital video recorder, and will always be prone to crashes, the software hang-ups, system instability, virus problems, etc. ..
Stand alone.
Very similar in appearance and control functions the standard VCR recorders, are truly remarkable devices. MoreHardware video editing is done, so system crashes, the video on the hard disk is stored in digital form. The base operating system, usually Linux, is permanently stored on special processor, witch is impossible to overwrite or corrupt. Designed and manufactured with single application in mind, it is much better in terms of performance and reliability of its PC-based rivals.
Some DVR systems can also help remote monitoring if monitoring is requiredin different locations through Internet or network. The future is more important to look at when choosing the right DVR are motion detection and search for the image frequency. The higher the frequency of the video recording smoother. Motion detection allows you to record video from each camera only when motion is detected, which is great for extending video recording.
Safety monitor.
Video from Security recorder could be displayed on regular TV monitor. Is it okay to do it this wayBaby monitoring or residential application, when the image quality is not so important. However for professional installation, security monitors as important as cameras. They offer a longer life of the cathode ray tube (possibly with a static image, the image can lead to burnout) and much grater resolution.
Cables and wires.
Finally any camera installation will require proper wiring. Good quality cable to prevent the degradation of video over a long distance race. It isor recommend using RG6 RG59 coaxial cable, since it is completely shielded and remains loss of video signal up to 400 m. Coaxial cables are necessary to prevent the BNC connectors and proper installation possibly done by experienced technicians. Be used in short runs plug and play without pre-installed coaxial cable with BNC connectors (up to 150 feet) are. The plug & play cables are easy enough to install the less experienced users.
Cable for CCTV cameras consist of two cables bundled with a jacket. A cablefor video and one for power delivery.
Conclusion.
Each CCTV system is as reliable as its weakest component. In this sense, investing in quality and performance of the cameras, while purchasing low performance recorder, from economical and practical standpoint just does not make sense.
For example, why use the CCTV cameras with 500 TV lines of resolution with monitor that offers only 380 or less. All benefit from high-resolution camera is affectively sacrificed bylimited capacity of the monitor. Asking questions is important, before purchasing the security video system and your suppliers are likely to give more details and recommend equipment for specific needs and requests.
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