The situation on the road is always fraught with a certain element of surprise and the dangers that can arise at any moment . In any controversial circumstances indispensable becomes small device fixed to the windshield and impartially retaining all the events. More and more drivers understand the importance of such a device and attempt to figure out how to select the DVR . In this article we will describe the main parameters affecting this choice .
The quality of the video recording
It should be noted that we are talking about the quality of writing rather than viewing on a built-in screen . The fact is that almost all modern cameras are capable of transmitting high-definition video , but the resolution of the recorded image depends mainly on the power control processor and its ability to handle large flows of information . The more powerful processor – the more detailed the recorded image . The second indicator is the write speed – a good DVR should be able to record high-quality video in real time, ie, maintain a speed of 30 frames per second at full resolution. Modern DVRs entry-level work in a format HD – Ready (1280 x 720) , the more expensive models provide a record Full HD- video (1920 x 1080) . In the analysis of what the DVR to select output resolution and the recording speed are paramount.
Viewing angle lens
To get the most complete picture of built-in camera to capture a large area in front of the car. How to choose a DVR that can record information about the movement in several bands ? To do this, note the value of the angle of view that is recommended in the technical data . The optimal value is 120 °.
The presence of the second chamber
Established Camera DVR is always directed at the road. Some models have included an additional video camera that can be installed in any convenient place and monitor the situation in a different area of interest . Typically, the second chamber has a lower resolution than the base , often with the use of two cameras recording speed for each is reduced by half . Therefore, these DVRs can be viewed as a compromise between visibility and image quality.
The existence and size of the display
Availability display – a necessary function . With it used to configure the camera with the initial installation . The main purpose of the display is – a demonstration of the recording when necessary , for example, to support its position in a conversation with the inspector DPS. Therefore, the larger the screen, the higher the resolution – the better picture you will be able to show. Please consider this when you think about how to choose a DVR .
Additional Features
Here is a list of useful , but not the most important functions , which can be a nice addition to the above :
GPS- module – allows with the video recording the coordinates and speed of the vehicle
Infrared light – a few LEDs, which are designed to improve visibility in the dark. The function came , apparently , from the professional video surveillance systems , where it is enough demand. In Car DVR does not make much sense, because the road is much better illuminated by car headlights
G- sensor. Responds to a strong blow , such as an automobile collision , and writes a special file with information about the events of a few seconds before and after impact , and marks it as a non-erasable . It may be useful to not overwrite information about the collision , if the machine crashes after registration continues to move with the DVR .
Once again , we note that these functions are not critical to address the issue of how to select the DVR , but simply provide additional services often by quite a decent increase in the cost of the device.
In summary, we note that the main points on which we should pay attention to are the resolution and recording speed , the angle of the camera , as well as the large display and the secondary camera . We hope that our article will help all motorists who are looking for an answer to the question of how to select DVR , ensuring their safety in any disputed situations.
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