Comparison Atis AT-400FHD vs Slinex ML-20HR

The number of megapixels in the camera sensor, in other words, its resolution. A megapixel is one million light-sensitive dots (pixels) that make up an image; the resolution of modern matrices is very high, so it is more convenient to use just this method of designation. However, for call panels, the values are 1 MP, 1.3 MP and 2 MP. More advanced options are extremely rare.

The higher the resolution of the matrix, the higher the video resolution can be (see below), the more detailed the image can be provided by the door panel camera. At the same time, note that as the number of megapixels increases (without changing the size of the matrix), the size of each individual pixel decreases, which increases the likelihood of noise and deterioration in the overall image quality. Therefore, high resolution in itself is not necessarily a sign of high quality — a lot depends on other things, for example, on the size of the matrix (see above).

The maximum video resolution that the call panel camera can provide.

The higher the resolution of the video, the more details you can see on it, the less details will be blurry. On the other hand, high resolution means large volumes of video materials, which, accordingly, requires fast communication channels, and this indicator significantly affects the cost of the device.

Resolution of the image produced by the camera of the video panel (see "Type"). In such cameras, an analogue signal transmission format is used, and for it the resolution is usually indicated not in pixels horizontally and vertically, but in TVL — TV lines. This is due to the fact that the image in the analogue PAL and NTSC colour systems always has the same vertical size — 625 lines. Therefore, to indicate the differences between "pictures" of different resolutions, it is enough to know the horizontal size — i.e. number of lines.

In fact, this parameter describes the quality of the image that is displayed directly on the screen connected to the camera. The higher the resolution in TVL, the more detailed the image will be produced by the camera; this is especially important for models with wide viewing angles (see below). On the other hand, in order to use all the features of a camera with numerous TV lines, a screen corresponding to these features is also required; For more details on compatibility with the screen, see specialized sources.

The lowest level of illumination of the observed area, at which the camera of the video panel (see "Type") is able to "consider" the surrounding objects without additional illumination. This parameter is expressed in lux, and thanks to special tables it is possible to estimate what actual level of illumination corresponds to a particular value (for example, 0.01 lux — a clear night with a quarter of the moon, etc.).

The lower this value, the generally better the camera is for low light conditions and the darker the environment in which it can be used without backlight.

This protection describes how well the case protects sensitive internal components from dust and moisture. By default, it is denoted by the letters IP followed by two numbers — IP44, IP54, IP55, IP65, IP66, etc. The first digit means protection against the ingress of solid objects and dust, and the following levels of protection correspond to its individual values:

4 — protection against objects with a diameter of more than 1 mm
5 — dustproof (full protection against contact; dust can penetrate inside, but does not affect the operation of the device)
6 — dust tight (enclosure with full protection against dust and contact). br> Smaller values do not occur and there is no point in specifying them.

The second digit characterizes the protection against moisture, here the values \u200b\u200bcan be as follows:

1 — protection against 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 the device to be operated in the rain);
4 — from splashes from any direction;
5 — from jets from any direction;
6 — from sea waves or strong water jets;
7 — the p...ossibility of short-term immersion to a depth of 1 m (without the possibility of continuous operation in immersed mode);
8 — the possibility of long-term immersion to a depth of more than 1 m (with the possibility of continuous operation in immersed mode).

Of course, outdoor panels are not designed for immersion 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 was not certified according to the IP standard. At the same time, the degree of non-certified 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 closeness (minimum dust resistance level 5).

The operating temperature range of the call panel is the air temperature at which the device is guaranteed to remain operational.

If the panel will be used in a residential apartment, house, office or other premises with similar conditions, you can ignore this indicator: all modern models have a temperature range that is more than sufficient for such conditions. But if the device is planned to be installed on the street, it is necessary to make sure that its operating temperatures correspond to climatic features. It is worth noting here that nowadays panels are produced both for very cold weather (-30 °C and below), and for extreme heat(+50 °C and more). A high temperature threshold is also important if the device will be exposed to direct sunlight — under sunlight, the case can heat up to very high temperatures, noticeably higher than that of the surrounding air. And some models combine frost and heat resistance.