Recorder
This parameter refers to the included DVR and describes the types of video signal (and therefore cameras) with which it is compatible. In some cases, the model is also indicated - for connoisseurs of the matter. So you can learn more about the capabilities of the device on specialized sources.
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Analog. Recorders capable of working only with analog cameras, usually connected via the BNC interface (see below). The functionality of such devices is less extensive than in digital and hybrid models, but they are simple, inexpensive and quite capable of coping with basic video surveillance tasks. We also note that a modern analog recorder usually has video outputs and service interfaces in a digital format - primarily HDMI and LAN (see below).
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Digital. Recorders designed to work with IP cameras - that is, cameras that transmit video signal through computer networks. This signal format provides improved noise immunity and a greater number of additional features compared to analog. In addition, it allows you to build video surveillance systems based on existing local networks, and cameras can be connected not only by wire, but also wirelessly (see below for more details). On the other hand, digital recorders and cameras are more expensive than analog ones, advanced functionality is not often needed in practice, and the transfer of a large number of video streams can create a high load on net
...work equipment. Therefore, it makes sense to purchase such a recorder only if the described advantages have crucial.
- Hybrid. Recorders that combine the capabilities of analog and digital models - that is, compatible with both analog and IP cameras. This combination allows you to combine the advantages of both types and partly compensate for the shortcomings, but significantly increases the price of the registrar.Camera model
A model of pointed cameras supplied with a video surveillance kit. Knowing this data, you can find detailed information on the cameras and clarify their characteristics. Also, if you buy additional cameras of the same model, you don't have to worry about compatibility.
Martix type
The type of matrices used in pointed cameras.
— CMOS. Also known as CMOS. Matrices of this type have good speed, small size, low power consumption and lower cost than CCD. On the other hand, the image quality of CMOS matrices is somewhat worse, and the noise is noticeably higher. However, these shortcomings can be corrected with the help of constructive tricks, and the technology itself is constantly being improved. Therefore, today CMOS matrices can be found both in inexpensive and in fairly advanced cameras; the actual quality of the sensor usually depends on the price category of the camera.
— CCD. Another well-known name is CCD. Compared to CMOS, such matrices are much more expensive and thicker, but they have lower noise levels and noticeably improve image quality. Of the practical disadvantages of CCD, it is worth noting that it is difficult to properly process point light sources; however, in many cameras, this moment is compensated to one degree or another by special technologies. Matrices of this type are typical for cameras of the middle and top levels.
— DIS. The main feature of DIS matrices is the presence of a built-in image processor in the sensor itself. This allows you to achieve good image quality with small dimensions and low cost of the cameras themselves. In addition, DIS matrices are resistant to low temperatures, which makes them especially suitable for outdoor applications.
Matrix size
The physical size of the sensor in the pointed cameras is diagonally, in inches (fractions of an inch).
The larger the sensor, the less prone it is to noise, the better image quality it can provide, and the better it is suited to low light conditions. This is due to the fact that each individual pixel gets more light, because. on a large matrix and individual dots are larger. On the other hand, large matrices are more expensive.
Number of megapixels
Sensor resolution of pointed cameras in megapixels (millions of pixels).
Higher resolution allows you to get a more detailed "picture". However, increasing the number of megapixels without increasing the sensor size can result in poor overall image quality and noise, especially in low light. Therefore, in itself, the high resolution of the matrix does not guarantee high quality shooting.
Focal length
Focal length of the lens of pointed cameras included in the set.
The focal length is the distance between the lens and the matrix, at which the image on the sensor is as clear as possible (when the lens is focused to infinity). This indicator directly affects the viewing angles and the degree of magnification: the larger the focal length, the narrower the viewing angle and the more the camera "brings" the object. At the same time, it should be noted that the actual viewing angle is determined not only by the focal length, but also by the size of the matrix (see above). In fact, this means that with different sizes of matrices, lenses with the same focal length will have different working angles. Therefore, only cameras with the same matrix size can be compared with each other according to this indicator.
Horizontal viewing angle
The viewing angle of the directional cameras supplied as standard is horizontal.
Wide viewing angles allow you to cover a large area; this is especially important given that directional cameras are often made stationary. On the other hand, all other things being equal, a larger viewing angle will mean a lower degree of magnification - objects will look smaller, detail will be worse. Therefore, when choosing according to this parameter, you should proceed from what is more important - a wide field of view or “range”.
Water resistance
The degree of protection of the camera from moisture and foreign objects according to the IP standard. Thanks to it, it is possible to select
waterproof models available for full outdoor use.
This protection describes how much the camera body protects sensitive internal components from these impacts. Standardly, it is denoted by the letters IP followed by two numbers. The first digit means protection against penetration of solid objects and dust; its individual values correspond to the following levels of protection:
1 - protection from objects with a diameter of more than 50 mm (large body surfaces)
2 - from objects with a diameter of more than 12.5 mm (fingers, etc.)
3 - from objects larger than 2.5 mm (most instruments)
4 - from objects more than 1 mm (almost all tools, most wires)
5 - dust protection (complete protection from contact; dust can penetrate inside, but does not affect the operation of the device)
6 - dust-tight (case with complete protection from dust and contact).
The second number characterizes protection against moisture, here the values can be as follows:
1 — protection from vertically falling drops of water;
2 - from water drops with a deviation of up to 15° from the vertical axis of the device;
3 - from water drops with a deviation of up to 60° from the vertical axis of the device (the minimum level that allows you to operate the c
...amera in the rain);
4 - from splashes from any direction;
5 - from jets from any direction;
6 - from sea waves or strong water jets;
7 - possibility of short-term immersion to a depth of up to 1 m (without the possibility of constant operation in submerged mode);
8 - possibility of long-term immersion to a depth of more than 1 m (with the possibility of constant operation in submerged mode).
Of course, surveillance cameras are usually not designed to be submerged under water - the last two options only characterize a high degree of moisture resistance.
In some models, one of the numbers may be replaced by the letter X - for example, IPX7. This does not mean that there is no protection, but that the corresponding parameter is not certified to the IP standard. At the same time, the degree of uncertified protection can be quite high - for example, the example above corresponds to the possibility of complete immersion under water, which requires a high degree of closure (at least dust resistance level 5). We also note that the complete absence of IP marking also does not mean that the camera is absolutely not protected from negative influences - again, the point is that the body simply did not undergo official certification. However, if dust and moisture protection are critical, you should choose among IP-certified models.USB
The number of USB connectors provided in the design of the complete recorder.
USB is a universal interface that can be used to connect various peripheral devices to the recorder. The specific set of supported peripherals may be different, but almost all models with such ports are able to work with external drives (flash drives and hard drives) — in particular, copy footage to them and even record directly (specific functionality, again, may vary) . Up to 3 USB ports in modern recorders can be provided, which allows you to connect several devices at the same time.
