It’s no secret that car traffic is a source of increased danger. In particular, about 200,000 traffic accidents a year occur on the roads of our country. None of the drivers are immune (in a figurative sense) from this problem. Of course, you need to follow the rules of the road and monitor the technical condition of the car, but what if the accident is not your fault? In this case, a DVR can be very helpful, which can prove it (and help someone else with it).
Xiaomi Yi Car WiFi DVR
So, a car DVR is a video camera without optical zoom, designed for continuous loop recordingwith car mount and charger. At the same time, DVRs have a wide-angle lens, as well as a minimum number of “bells and whistles” that are unnecessary for their function.
DVRs have a set of qualities and characteristics that determine how good or bad they are compared to other similar devices. Our article will tell about them.
This is perhaps the main technical characteristic of the registrar. She is responsible for how the details on the video will be distinguishable. In particular, for those situations in which video recorders are used, it will be especially important, for example, to see the license plate number of the car that is in the frame.
Today, FullHD resolution, that is, 1920x1080, remains quite relevant, although there are models with a higher value of this indicator. In fact, a high resolution is really useful, since the registrar may need only one frame with a clear car number.
However, you should not “behave” solely on the resolution of the picture. The fact is that for cheap models (especially little-known manufacturers) it can turn out to be interpolated, that is, artificially processed upwards.
Frames per second
The DVR is obviously designed to capture moving objects, and this movement can be very fast. For example, two cars moving towards each other at a speed of 60 kilometers per hour approach each other at a speed of 33 meters per second. Therefore, the registrar must have a frequency of at least 24 frames per second, and preferably 50 or 60.
Here we come to the fact that the registrar must support any of the modern video formats: MPEG4, AVCHD and so on, otherwise high frame rate at high resolution will not be possible.
If you are an advanced user, you can pay attention to the model processor registrar, since it is he who is responsible for the volume of the video stream. The more powerful it is, the better.
Image enhancement features
In addition to resolution, the following functions can affect the picture quality of the DVR:
Image stabilizer — reduces the “jitter” of the picture caused by shaking and vibration of the engine.
infrared illumination — allows you to shoot in the dark, if available night mode. If it is absent, when choosing, you should pay attention to the characteristic of the minimum illumination of the registrar — it is just responsible for the quality of the picture at night.
WDR (Wide Dynamic Range) function — dynamic range expansion — reduces, up to a certain limit, flare from the sun, overexposure in the sky, and so on.
Lens viewing angle
From lens field of view depends on whether this or that object gets into the frame of the DVR, so here the more, the better. True, with an increase in the angle, the quality of the image as a whole is lost, but in real life this can be neglected.
On common models, the angle can be 120 to 170 degrees. It should be noted that the larger the angle, the more the effect of the fisheye lens is manifested, that is, the “curvature” of the picture. We can say that in the case of developing optics for DVRs, manufacturers do not seek to compensate for these geometric distortions, since the beauty of the picture in this case is completely unnecessary.
All DVRs do not record video in one file, but break it into segments with a certain duration. When the memory capacity is exhausted, the oldest file is deleted and a new one is written in its place. Accordingly, the registrars have the ability to choose the length (in minutes) of these segments.
When choosing, we also advise you to find out if there are gaps in the record between these segments; you can find out, for example, from reviews on the Internet.
memory and autonomy
DVRs, as a rule, do not have built-in memory, but use SD or MicroSD memory cards. There may be a limit on the maximum size of the memory card, so if you need 64 or 126 GB of memory, you should pay attention to this.
As for autonomy, here you can observe a great variety. So, some devices can work on battery power for only 1 minute, and this can be inconvenient. At the same time, most popular models now work 2 hours or more.
Display size and resolution
With this characteristic, everything is quite obvious. A good screen will allow you to assess the picture of the incident directly on the road, and is also more convenient for settings. There are also models with two displays, such as the Street Storm STR-9970 Twin.
DVR Street Storm STR-9970 Twin
Combination with other devices
In addition to the DVR, in the car, for example, a radar detector and a GPS navigator can be used. In the case when these are separate devices, the view from the driver’s seat is reduced, several charging cables are required. It is very uncomfortable. Therefore, video recorders combined with radar detector.
DVR SHO-ME Combo 1
When choosing such a device, you should pay attention to the capabilities of the radar detector.
First, this frequency rangesin which the radar detector works. K, Ka, Ku, X bands can be applied.
Also, the specifications may indicate which specific radar models the device detects.
Modern speed meters can also use laser ray for your work. Modern radar detectors can also detect it, however, not all of them, and therefore you should pay attention to this when choosing a device.
An important characteristic of a radar detector is its selectivity, that is, the ability to isolate the most dangerous among all signals. Radar detectors with low selectivity will, for example, respond to automatic supermarket doors.
Also, it is worth mentioning such a useful function for the registrar as GPS. If available, the device can record the speed and location of the car and display them on the video. This will allow you to once again not prove your case in the event of an accident.
Automatic start recording, motion and shock sensors
The main features that make the DVR convenient for its task are precisely these functions.
Auto start recordingdepending on the manufacturer, can be performed when power is supplied to the recorder (when the car is started), or when the movement starts.
Motion Sensor in the frame also starts recording, allowing, for example, to use the DVR as a stationary surveillance camera.
Shock sensor (G‑sensor) serves to ensure that in the event of an accident, the registrar automatically saves the recording segment recorded at that moment.
Whatever the technical characteristics of the DVR, it is the mount that can become decisive when choosing. First, there are several types:
- on a suction cup. This type of mounting is the most common, convenient because it can be used in almost any car, the recorder can always be removed and reinstalled. The downside is that the suction cup must be airtight, fit snugly against the glass, otherwise the mount will be fragile. and in the event of an impact, such a mount may not be reliable enough.
- Adhesive tape mount — more secure than a suction cup, but does not allow you to dismantle and install the mount as easily.
- Video recorder in the case rear view mirrors.
- The advantages and disadvantages of such a solution are obvious. On the one hand, the device does not occupy a separate place in front of the windshield, on the other hand, the rear-view mirror itself is smaller due to the display located on it.
The quality of the connection of the recorder body with the mount is also important. The fact is that the DVR must be fixed as rigidly as possible, in order to avoid vibration. No long, flexible, swivel connections are suitable here. In addition, the mount to the body of the registrar should be located as close as possible to its center of gravity, which reduces the load on the mounts.
We can say that a good car DVR does not remind you of itself when it is not needed. But at a critical moment, it may turn out that this device can save you from very serious troubles. Therefore, you should not save and buy the cheapest model, especially since, in addition to performance, reliability is also important for it, especially under conditions of constant shaking and temperature changes.
In general, there may be some points that are not mentioned in our article, but, in our opinion, it provides enough information to make the right choice.