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| CCTV Camera |
When choosing a suitable IP camera, there are several important parameters that you should pay attention to. In the following lines we will list the most important ones.
Resolution
The most important parameter that affects the quality of the camera is its resolution. This determines the amount of detail that the camera can capture. The farther an object is from the camera, the greater the benefit of high resolution. Thanks to this, you can recognize e.g. the face of a potential thief from a greater distance, resp. in higher quality.
The resolution can be expressed by two parameters. Size in megapixels (MPx) or number of horizontal and vertical pixels .
The most common are cameras that have a resolution of 2MPx , which means that the camera can capture approximately 2 million pixels in the image. This resolution corresponds to e.g. 1920x1080 resolution (also known as Full HD). You can easily find the resolution in megapixels very easily. Just multiply the number of vertical pixels by the number of horizontal pixels. In this case, 1920 * 1080 = 2 073 6000, which is rounded to 2 million pixels, i.e. 2 megapixels.
All you need to know about resolution is that the higher it goes, the better. Commonly available IP cameras have a resolution of up to 8MPx.
Frame rate
The second most important parameter that affects quality is the frame rate. As you probably know, a video is nothing more than a series of images followed in quick succession.
So the camera works on the principle that it captures the current scene over and over again. This happens many times per second. And that's how often the frame rate tells us. The frame rate is given in FPS units . (frames per second)
When choosing an IP camera, you will usually encounter values from 12.5 to 60 FPS . Again, the higher the value, the better.
The number of frames per second is especially important when changing rapidly in the monitored environment. In practice, it can be e.g. a motor vehicle passing by or a fleeing thief. In this regard of lower number of images, it often happens that moving objects are blurred, which makes it essentially more difficult or even impossible to identify them (e.g. the face of a thief or the registration number of the vehicle). But the savings are redeemed precisely by the limitation in the form of a lower frame rate.
Lens focal length and angle of view
The angle of view, as the name suggests, determines the camera's view. Choosing the right angle is very important and depends on the desired use and location of the camera.
For example, in a narrow corridor, it will be appropriate to choose a camera with a narrower angle of view, so that we can use the potential of the camera as reasonably as possible and not capture unnecessary parts of the space, such as side walls. Conversely, in a larger room and open space, you will need to capture the image at a greater angle to cover the space with a camera system as efficiently and without blind spots.
You will normally encounter angles of view from 23 to 114 and with fisheye cameras up to 360 .
The angle of view is directly determined by the focal length of the camera lens. This is given in millimeters and its values for conventional cameras range from 2.8 to 12 mm. A special category consists of cameras with so-called varifocal lens . From the point of view of the angle of view, it is practically a universal camera on which it is possible to set the focal length as needed.
All you need to know about the focal length of the lens is that the higher it is, the narrower the camera's angle of view.
Infrared illumination
Infrared illumination allows the camera to be seen even at night. The range of the illumination and the type of infrared diode technology of the camera are important for this parameter.
Cameras with IR / LED or ExIR illumination are appearing on the market. Cameras with IR / LED illumination use older and less advanced technology than those with ExIR diodes.
The range of afterglow for currently sold cameras ranges from 30 to 200 meters. However, the effective range is usually around 50% of the stated value, so if, for example, you want the camera to fully see at 50 meters at night, you will ideally need a camera with a backlight range of 100 meters. Although the camera can continue to illuminate, the intensity of the illumination will decrease with each additional meter.
The dawn of the camera is, of course, invisible to the human eye.
Resilience
The resistance of the camera (technically called the degree of protection by the cover) determines the certified level of protection against various adverse effects. It is divided into two types. Protection against penetration of objects or particles and protection against mechanical damage.
Resistance to penetration of objects or particles (eg dust or water) is indicated by the index IP and resistance to mechanical damage by the index IK .
The highest IP rating is IP68 , which guarantees protection against permanent immersion in water. IP cameras most often have a rating of IP66 (protection against intense splashing water) or IP67 . (protection in case of temporary immersion in water)
Regarding protection against mechanical damage, the IK rating is divided according to the energy of the impact. Protection against mechanical damage has an 11-degree scale. From IK00 (unprotected) to IK10 (impact protection with a force of up to 20 joules) Cameras with an IK10 rating are referred to as "anti-vandal" cameras .
Compression
Compression is the ability to process and store data more efficiently. In the case of an image and sound camera. Uncompressed raw video would be huge in size and could not be transmitted in real time over the Internet or efficiently stored. Therefore, each video must be automatically compressed when captured.
Today, the two most common compression methods are H.264 (also known as x264) or H.265 (x265). The latter method is more modern and is the successor to the former. However, it requires higher computing power and therefore some cheaper or older cameras do not support it.
The difference between the two methods is in data saving. Compression with H.265 is in some cases more economical by more than 50%. In practice, this means that you only need a slower internet connection to view the current events on the camera, but mainly that the recordings from the camera will take up half the storage space
Recording device
We should make cameras, now just turn them into a camera system. This is the so-called NVR recorder . It is a device that can combine cameras into a system. Thanks to the recorder, we can watch the cameras much easier, switch between them, control them, and most importantly, it will take care of storing the camera record.
How many days can CCTV store videos?
Nowadays many need to record videos and pictures for a long time. Most hostels need a long history. Usually, the latest CCTV camera in bd can record for 90 days. In some sophisticated sectors there needs significant storage to record important events.
How much data does a CCTV camera consume a day?
Different types of CCTV cameras consume different amounts of data. In steady-state, some CCTV cameras consume 5 Kbps. In some cases, some cameras can consume 6 Mbps.
Conclusion
It is a foregone conclusion that the above parameters are the standards to choose the best CCTV cameras. If someone follows the tips and parameters to select the desired CCTV cameras they will surely be successful in choosing the best CCTV cameras. You can check the CCTV camera price in Bangladesh.
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