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Security Camera System – Buyer’s Guide
Although the application of CCTV security has not changed much in recent years, the tools and equipment have changed significantly. Cameras got smaller, cheaper and better, but the big breakthrough came in recording equipment.
Therefore, many customers who purchase complete CCTV surveillance and recording systems are confused about the truth of the products available. The aim of this article is to guide buyers towards the best possible and most economical type of CCTV equipment, based on their intended implementation and requirements.
Selecting the right cameras.
It is practically impossible to describe all the types available in this short article. Instead, we will focus our attention on the most popular and widely used types of cameras.
CCTV security cameras produce images using CMOS or CCD (Charge Couple Device) chips. Small, very low-priced CCTV cameras often use CMOS technology, produce poor quality images, and have very poor light sensitivity. Decent quality CCTV cameras use CCD technology. The size of the CCD chip is usually 1/4″, 1/3″ or 1/2″. As a general rule, the larger the size, the higher the quality of the image produced and the higher the price. However, the higher density 1/4″ and 1/3″ CCD chips can now produce an image as good as many 1/3″ or 1/2″ chips.
The number of TV lines in the security camera image is a measure of image resolution (sharpness). The higher the number of TV lines, the better the resolution and therefore the overall picture quality. A standard resolution camera can have between 350 and 380 lines, more than 400 TV lines is generally considered good resolution while more than 500 TV lines is considered high resolution. B/W chip cameras produce higher resolution and better light sensitivity, making them suitable for use in dark areas where light conditions are poor most of the time.
On the other hand, color cameras offer a more realistic and natural image. CCTV cameras are often divided into different types based on the camera body used.
Professional grade cameras.
Having a box-like body with the ability to use different types and sizes of lenses. Interchangeable lenses allow this camera to monitor objects from virtually any distance. Although for indoor use, they can be used outdoors when paired with a weatherproof housing. They are considered the most flexible and widely used by professionals for commercial installations.
Bullet chambers are, as the name suggests, contained within the bullet-shaped casing.
Most bullet cameras are weatherproof and sealed without the ability to use different lenses. The big advantage of the bullet camera is the small size and integrated design, some bullet cameras will even have built-in infrared LEDs in the future. Infrared technology is simply LED light in the infrared spectrum (not visible to the human eye). This light will illuminate the viewing area, enabling tracking in complete darkness. This is a great future, but it only works up to a certain distance (usually 10-50 feet, depending on the model). Simple to install and aesthetically designed, bullet cameras are an excellent choice for residential and DIY installations where objects are monitored. they are about 25 feet from the camera location (with standard 3.6mm lens).
Cameras are basically fixed lenses mounted on a circuit board. These cameras can be packaged in a small case (Mini Cameras) or dome (Mini Dome) or simply sold unpackaged, to be assembled by the buyer. The lenses on these are either an industry standard aperture or a very small aperture “pinhole” lens. Pinhole cameras are often referred to as “spy” cameras and can be mounted in a hidden manner for covert surveillance purposes. The most popular examples of covert plates are smoke and motion detector cameras.
Because plate camera lenses are pre-mounted, have a fixed iris, and usually have a short focal length (i.e., wide angle), their flexibility of utility is limited. However, this type of camera can provide a low-cost solution in the right situation, especially in a home environment. We have briefly described the most popular types of cameras, we will now discuss how and where they are used.
Professional types with C/CS mount lens attachment usually offer the best performance and many important futures such as lens control output, backlight compensation and many more…
The distance from the tracking object to the camera is not an issue, which is why the ability to select different lenses based on location is so important. Installation is a bit complicated and professional installation is highly recommended. We recommend this type of security camera for commercial facilities.
In comparison, most Bullet cameras don’t offer high resolution and lens selection flexibility, but they’re likely to be weatherproof, some will have built-in infrared, and above all, they’re relatively easy to implement. They usually come with 3.6mm lenses which are considered suitable for most standard installations (good for covering small to medium sized rooms or equivalent).
For larger rooms or longer distances, cameras with 6mm or larger lenses may be required. They are an excellent choice for any DIY installation.
In contrast, plate cameras are widely used in covert camera installations, sometimes called spy cameras. Many are basically boards with a built-in transmitter. We’re not going to get into wireless cameras at this point, as that would be enough material for a whole new article.
Board cameras are sold as a simple circuit board, for integration into hidden camera devices. They are also available in dome housing, as the popular dome camera varies or integrated with smoke detector, motion detector, exit signal, etc. Most also come with 3.6mm lenses although some will allow you to replace the lens.
Over time, the most practical design has been the dome camera with its aesthetic appearance that blends into the environment, especially with the drop-down seal, ideal for use in stores, lobbies, gas stations and other public places. The practical solution for covert installation is also motion and smoke detection cameras, which are absolutely not a substitute for your security alarm or fire protection. They should always be selected based on the location of the camera (indoor/outdoor), the distance of the tracking object, the light condition and the budget.
When buying security cameras, customers are faced with the fact that they will have to select one recording device or another.
The days of the well-known CCTV time-lapse video recorder are almost over.
Although some customers still prefer this old recording solution, it is worth investing some extra money to buy a good quality digital video recorder (DVR). The digital recorder transfers the video feed from the analog camera to digital format and stores it on the hard drive. There are two main types of digital recorders on the market today.
PC based systems.
A special board and software installed on the computer will allow camera inputs and store video on the hard drive.
Many people have the misconception that a personal computer with additional hardware installed will do the job. This explains the hundreds of companies that put up a sign, took out some ads, and started working in basements and garages, posing as DVR manufacturers and security specialists. The main problem with this type of CCTV recorder lies in its main component… Yes, it is a computer, designed to perform unlimited tasks, but not well. The truth is that any computer-based digital video recorder is, and always will be, vulnerable to software glitches, crashes, system instability, virus-related issues, etc…
Very similar in appearance and control functions to standard VCR recorders, they are truly remarkable devices. Most of the video processing is done by hardware, so system failures are eliminated, the video is also stored on the hard drive in digital format. The basic operating system, usually Linux, is permanently stored in a special processor, which is impossible to overwrite or corrupt. Designed and manufactured with a single application in mind, it is far better in performance and reliability than its PC-based rival.
Some DVR systems will even have remote monitoring capability, useful when monitoring is required in different locations via the Internet or network. The most important futures to look for when selecting the right DVR recorder are motion detection and frame rate. The higher the frame rate, the smoother the video recording. Motion detection will allow each camera to record video only when motion is detected; this is great for extending video recording time.
The video from the security recorder can be displayed on the regular TV monitor. It’s fine to do it this way, for baby monitoring or residential applications, when image quality isn’t that important. However, for the professional installation, security monitors are just as important as cameras. They offer extended picture tube life (necessary with any still image, which can cause image burn) and much higher resolution.
Cables and wiring.
Finally, any camera installation will require proper wiring. A good quality cable will prevent video degradation on long distance runs. RG59 or RG6 coaxial cable is recommended as it is fully shielded and will prevent video loss up to 400 feet. Coaxial cables will require BNC connectors and proper installation possibly by an experienced technician. Plug and play non-coaxial cables with factory installed BNC connectors can be used on short runs (up to 150 feet). Plug and play cables are easy to install by non-experienced users.
Cables for CCTV cameras consist of two cables bundled into one. One cable for video and one for power delivery.
Every CCTV system is only as good and reliable as its weakest component. With this in mind, investing in higher quality and higher performance cameras, while buying a lower performance recorder, from a financial and practical point of view does not make sense.
For example, why use CCTV cameras with 500 TV lines of resolution with a monitor that only offers 380 or less. All the benefit of the high-resolution camera is affectively sacrificed by the limited capacity of the monitor. Asking questions is important before purchasing a video security system, and your salesperson will likely be able to provide more details and recommend equipment for specific needs and requirements.
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