Comparison Hikvision DS-J142I/7104HGHI-SH vs Tecsar AHD 4OUT

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.

- 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).

- 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 network 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.

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.

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.

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.

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”.

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 th...e camera 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.

The number of HDMI connectors provided in the design of the complete registrar.

The HDMI interface is actually a standard for modern video equipment, it is widely used in TVs, monitors, projectors, etc. Usually, in modern registrars we are talking about HDMI outputs. This output allows you to broadcast a digital signal to an external screen, such as a TV; at the same time, both video and audio are transmitted via a single cable, and the bandwidth is enough to work with HD resolutions and multi-channel audio. The recorder itself can be used as an external video player, to play the footage, or directly broadcast video / audio from the camera (cameras) via HDMI. Models where there are more than one such outputs are practically never found.

The maximum frame resolution in which the complete recorder can record video if all video channels are involved in operation. In fact, we are talking about the highest resolution in maximum load mode; if some channels are idle, some models allow higher resolutions. However, it is customary to indicate this parameter in the specifications - it most accurately characterizes the capabilities of the device.

As for the resolution itself, the higher it is, the more detailed the image is; on the other hand, such video requires significant processing power and capacious storage drives, which affects the final cost of the equipment.

Popular maximum frame resolutions in which modern recorders record: HD (720), Full HD (1080), Quad HD, Ultra HD (4K).

The highest frame rate at which the complete recorder can record at full load when all video channels are used. In other words, this is the guaranteed maximum frame rate that can be achieved at any load level (with some channels idle, the number of frames per second may be higher, but not necessarily).

The higher the frame rate, the better fast movement will be captured, the less blurry objects in such scenes will turn out. On the other hand, this indicator directly affects the cost of equipment and the amount of memory occupied by the footage. For video surveillance systems, an indicator of 24 fps is currently considered the minimum necessary, 50 – 60 fps is not bad, and in the most advanced registrars this number can reach 120 fps.