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Itook Pergas Deniz Computer and Electronics Company

The main branch of the computer and electronic company Itok Pergas Deniz is buying, selling, upgrading, supporting and consulting on all computer and electronic systems.
Complete information about CCTV cameras (Part 1)
The word "CCTV" is a Persian translation of the English word closet circuit television, or cctv for short. The literal meaning of that magic box is CCTV, and it's called cameras that are fixed in place.

What is a CCTV camera?

The word "CCTV" is a Persian translation of the English word closet circuit television, or cctv for short. The literal meaning of that magic box is CCTV, and it's called cameras that are fixed in place.
CCTV refers to all cameras that are fixed in place and send images to one or more locations. Because most of these cameras are used in security, surveillance, and security monitoring systems, the term is more of a term, but its technical meaning even includes video and conference video cameras.

History:
The first CCTV system was installed in 1942 by the German company Siemens to observe the launch of v2 missiles. A German engineer named Walter Bruch was in charge of installing the system.
In the United States, the first CCTV advertisement in 1949 was related to a product called Vericon, which stated that advertising did not require a state license. It was used and soon installed on missiles to the point where it sent images to Earth with sound.
The first CCTV unveiling in US public places was in 1973. When the first CCTV camera was installed in the New York Times Square to prevent crime, it did not play a significant role in reducing crime. Until the 1980s, CCTV cameras were widely used throughout the United States, especially in public places. Using a CCTV camera seemed to be a cheaper way than using police to detect crimes.
Gradually, some professions and occupations, especially those that were more prone to theft, also turned to CCTV. In 1990, camera imaging devices entered the market only with the "recording after motion detection" feature, which greatly increased the use of CCTV in the country. Prior to that, image capture devices were largely limited in terms of storage size and capabilities. Since the second half of 1990, the police have installed many cameras in cities, especially public centers, schools and construction projects.
In the UK, the use of CCTV has become very common. The city of Norfolk, England, was the first place in the country where cameras were installed. In general, the use of CCTV cameras became common in many countries between the 1990s and 2000s.

CCTV Applications:

The main use of CCTV cameras is in protection systems, but its applications are not limited to security systems and go beyond applications such as police, military, space, industrial, traffic control, video communications, and intangible imaging.

Preventing Crimes:

CCTV is widely used to prevent crimes. From driving offenses to criminal offenses. Imperceptible use of hidden cameras is also very common. Examples include ATM cameras, which are used to detect crimes such as accidentally entering a credit card password.

Recent statistics from major cities in the United States and the United Kingdom show that the number of crimes has dropped by 51 percent since CCTV cameras were installed in parking lots. At airports, the crime rate has dropped by 23%, and in other public centers it has risen to 7%.

Industrial application:

In industrial plants, CCTV cameras are also used in places or stages of work where the physical presence of a human being is dangerous, difficult or even impossible. In factories such as chemical plants or nuclear power plants. In industrial centers, the use of production line scanning cameras and thermal cameras is very common.

traffic control :

Today, CCTV cameras are widely used in most countries around the world to control vehicle traffic. Including controlling the amount of traffic on the streets and sending information by GPS to drivers who intend to cross those streets. Monitoring accidents and identifying driving offenses are the minimum applications of CCTV cameras in vehicle control. Automatic identification of license plates is one of the latest achievements of CCTV cameras in this sector.

Types of CCTV:

In terms of signal type:

Analog cameras
Ip cameras (network IP)
Dual-purpose cameras

In terms of appearance and corresponding application:

Dome trap cameras
Industrial cameras
Miniature cameras
Infrared cameras ir
Speed ​​Trap Cameras (ptz rotating cameras)

In terms of frame and cover:

Large frame waterproof cameras (gas station)
Hidden Cameras
Fantasy frame cameras

Analog cameras

These cameras are the first generation of CCTV cameras that use analog waves to receive and send audio and video information. It plays the main sound from the noise. The most common cable for these cameras is the rg59 coaxial cable, although it is possible to connect the image of these cameras to different cables as needed.
The quality of these cameras, as their name suggests, is a function of analog waves. Analogue waves are always exposed to noise. Various electromagnetic noises and noises caused by power fluctuations are always serious threats to the quality of analog CCTV cameras. For this reason, the use of high quality cables and equipment has a great impact on the image quality of this type of camera.
These cameras show great weakness when you need to send images and sound wirelessly. If the images are to be transmitted in the same way as the analog, the frequency range of the analog waves must be used, and this affects the image quality more than ever before due to the noise and interference waves. At the same time, it is easy for anyone else to view the images in the range. So it can never be a safe and secure way to send analog images.
There is no way to capture digital images to capture analog images. So in the end, analog images need to be converted to digital. For this purpose, the "digital image recording" device dvr is used. DVRs are devices for recording and controlling images of analog cameras. This device also allows digital control and communication with the network.

Due to the lower price of analog cameras than digital cameras, these cameras are known as common CCTV cameras in the Iranian market. Although the market has recently shifted to digitalization, and many organizations have turned to ip cameras, the replacement of this previous generation of cameras with the new generation of digital cameras is still slow.

Advantages of analog cameras:

- low price
- Extensive diversity in the Iranian market
- Ease of installation compared to digital cameras

Disadvantages of analog cameras:

- Analog quality: lower quality than digital
- Possibility of noise: due to the use of analog system
- High wiring cost
- Low quality and insecure wireless communication

As mentioned, analog cameras are still used in the Iranian market as conventional CCTV cameras. Perhaps one of the main reasons is the lack of network knowledge. Many companies train their employees just to set up and install analog cameras and skip relatively complex networking tutorials on digital cameras. Therefore, the demand for analog cameras in the Iranian market is still much higher than for ip and network cameras.
This also leads CCTV importers to import more analog cameras than digital cameras. However, one of the main advantages of analog cameras is their lower price. However, the same low price is lost in large projects at high wiring costs. Paying attention to the principle that each camera is connected to the controller with a separate wire, and this in itself increases the number of cameras and the high distance between the cameras, is a huge cost.
 
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