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.
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”.
Illumination range
The range of infrared illumination provided in the standard pointed cameras of the kit.
IR illumination allows the camera to shoot in low light conditions (up to complete darkness); at the same time, for a number of reasons, it is preferable to classical backlighting in the visible range. The backlight range is the approximate distance from the camera to the object at which it (in total darkness) will be normally visible in the frame. Note that actual visibility may vary greatly depending on the size, colour and reflectivity of specific items; Nevertheless, the claimed backlight range allows you to fairly accurately assess the "night" characteristics of the camera.
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.
Video compression format
The format in which the kit recorder records digital video.
This setting determines the codecs required to view content on external devices. When viewing on a computer with codecs, there are usually no problems: their set in modern operating systems is quite extensive, and the missing modules, usually, are easily found and installed via the Internet. But if you plan to view video materials through a media centre, a TV with direct playback via USB, etc. — It is worth making sure that this device supports the appropriate compression formats.
Technical details on different standards can be found in special sources.
