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Security Camera System – Buyer’s Guide
Over the past few years, the application of CCTV security hasn’t changed much, but the tools and equipment have changed significantly. Cameras got smaller, cheaper and better, but the big breakthrough came in recording equipment.
As a result, many customers who purchase a complete CCTV surveillance and recording system are overwhelmed by the number of products available. The purpose of this article is to guide the purchaser to the best possible and most economical type of his CCTV equipment based on the intended implementation and requirements.
Choosing the right camera.
It is virtually impossible to describe all available types in this short article. Instead, focus on the most common and widely used camera types.
CCTV security cameras use CMOS or CCD (Charge Couple Device) chips to produce images. Small, very low-cost CCTV cameras typically use CMOS technology, have poor image quality, and have very low light sensitivity. A decent quality CCTV camera uses CCD technology. CCD chips are typically 1/4 inch, 1/3 inch, or 1/2 inch in size. As a rule of thumb, the larger the size, the higher the quality of the image it produces and the higher the price. However, high density 1/4″ and 1/3″ CCD chips can now produce images as good as many 1/3″ or 1/2″ chips.
The number of televisions in the images of security cameras is a measure of the resolution (clearness) of the images. The more TV lines, the higher the resolution and the better the overall image quality. A standard definition camera may have 350 to 380 lines, generally 400 or more TV lines are considered high definition, and 500 or more TV lines are considered high definition. B/W chip cameras have high resolution and high light sensitivity, making them suitable for use in most dark areas with poor lighting conditions.
Color cameras, on the other hand, provide more realistic and natural images. CCTV cameras are usually classified into different types based on the camera body used.
A box-type body with different lens types and sizes is used. Interchangeable lenses allow this camera to monitor objects from virtually any distance. Designed for indoor use, but can be used outdoors when combined with a weatherproof housing. They are considered the most flexible and widely used by commercial installation professionals.
A bullet camera, as the name suggests, is housed in a bullet-shaped housing.
Most bullet cameras are weatherproof and sealed without the use of different lenses. A big advantage of bullet cameras is their compact and integrated design. Some bullet cameras will incorporate infrared LEDs in the future. Infrared technology is an LED light in the infrared spectrum (invisible to the human eye). This light illuminates the viewing area, allowing surveillance in complete darkness. It’s a great future, but it only works up to a certain distance (usually between 10 and 50 feet depending on the model) within about 25 feet of the camera position (standard he uses a 3.6mm lens).
A board camera is basically a fixed lens attached to a circuit board. These cameras are either packaged in a small case (mini camera) or dome (mini dome) or sold unpackaged for installation by the buyer. These lenses are either regular industry apertures or very small aperture “pinhole” lenses. Pinhole lens cameras are often called “spy” cameras and can be mounted in a covert manner for covert surveillance purposes. The most common examples of covert boards are smoke detectors and motion detector cameras.
Board camera lenses are pre-mounted, have a fixed iris, and typically have a short focal length (i.e. wide-angle), limiting application flexibility. However, this type of camera can provide a low-cost solution in the right situations, especially home environments. Now that we’ve briefly covered the most common types of cameras, let’s talk about how and where they are used.
Professional type with C/CS mount lens attachment usually offers the best performance and many important features such as lens controlled output, backlight compensation…
The distance from the monitored object to the camera does not matter. So being able to choose different lenses based on location is very important. Installation is a bit complicated and professional installation is highly recommended. We recommend this type of security camera for commercial installations.
By comparison, most bullet cameras don’t offer the high resolution and flexibility of lens selection, but they’re weatherproof, some have built-in infrared lights, and above all, they’re usually relatively easy to implement. , comes with a 3.6mm lens and is considered suitable for most standard installations (suitable for covering small to medium sized rooms or similar).
Larger rooms and longer distances may require a camera with a 6mm or larger lens. Perfect for DIY installation.
Board cameras, in contrast, are widely used in hidden camera installations, sometimes called spy cameras. Most of them are basically board type with built-in transmitter. I won’t talk about wireless cameras for now, as this would be enough material for an entirely new article.
Board cameras are sold as plain circuit boards for integration into hidden camera devices. It is also available in a variety of dome housings that integrate with common dome cameras and smoke detectors, motion detectors, exit signs, and more. Most of his products also come with a 3.6 mm lens, but some have interchangeable lenses.
Over time, the most practical design has been the dome camera, whose aesthetic appearance blends in with its surroundings, making it ideal for use in stores, lobbies, gas stations, and other public places, especially with its drop-down ceiling. Motion detection and smoke detection cameras are also practical solutions for installations, but they are no substitute for security alarms and fire protection. You should always choose based on camera position (inside/outside), distance from the monitored object, light conditions, and budget.
When purchasing a security camera, customers are faced with the fact that they have to choose between recording devices.
The days of the famous CCTV time-lapse VCR recorder are coming to an end.
Some customers still prefer this old-fashioned recording solution, but it’s well worth the extra money invested in a quality digital video recorder (DVR). Digital recorders transfer analog camera video feeds to digital format and store them on your hard drive. There are two main types of digital recorders on the market today.
A special board and software installed on your computer allows camera input and saves the video to your hard drive.
Many people have the misconception that a personal computer with additional hardware installed does the job. This explains why hundreds of companies have put up signs, advertised, started working in basements and garages, claiming to be DVR manufacturers and security specialists. The main problem with this type of his CCTV recorder lies in its main component…yes, a computer designed to perform unlimited tasks, but it just doesn’t work. The truth is that computer-based digital video recorders are and will always be vulnerable to software crashes, hangs, system instabilities, virus-related issues, and more.
A very nice device that looks and controls very similar to a standard VCR recorder. Most of the video processing is done by hardware, eliminating system crashes. Videos are also stored digitally on your hard drive. The underlying operating system (usually Linux) is permanently stored on a special processor and cannot be overwritten or corrupted. Designed and manufactured with a single application in mind, it has much better performance and reliability than its PC-based rivals.
Some DVR systems also have remote monitoring capabilities, which is useful when you need to monitor different locations over the Internet or network. The most important future to look for when choosing a suitable DVR recorder is motion detection and frame rate. Higher frame rate enables more fluent video recording. Motion detection allows recording video from each camera only if motion is detected. This is great for extending video recording time.
I was able to project the footage from the security recorder onto a regular TV monitor. For baby monitoring or residential applications, this method is fine if image quality is not critical. However, for professional installations, security monitors are just as important as cameras. They extend the life of the CRT (necessary for static images and can cause image burnout) and significantly improve resolution.
cables and wires.
Finally, camera installation requires proper wiring. A good quality cable will prevent video degradation over long distances. We recommend using RG59 or RG6 coaxial cables as they are fully shielded and prevent video loss up to 400 feet. The coaxial cable requires BNC connectors and must be properly installed by an experienced technician. In the short term, plug-and-play non-coaxial cables with factory-installed BNC connectors can be used (up to 150 feet). Plug-and-play cables are easy to install, even for inexperienced users.
CCTV camera cables consist of two cables bundled together in one jacket. 1 cable for video and 1 cable for power supply.
All CCTV systems are as good and reliable as their weakest component. With this in mind, it makes no sense from an economic and practical point of view to invest in the best quality and performance camera while buying a lower performing recorder.
For example, why use a CCTV camera with a resolution of 500 TV lines on a monitor that only offers 380 or less? All the benefits of a high-definition camera come at the emotional cost of the monitor’s limited capabilities. It’s important to ask questions before buying a video security system. Vendors may be able to provide more details and recommend suitable equipment for your specific needs and requirements.
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