Do you know how to buy a driving recorder?

In the process of purchasing driving recorder, we will encounter some tangled problems more or less. Bian Xiao has been asked many times, "Is it better to choose products with higher pixels?" "My driving recorder has a wifi function, but there is no display. Is this convenient to use? " "What brand of tape recorder is better?" Therefore, I will briefly summarize and sort out several problems about driving recorder that people often mention recently.

It is enough to read this article. Summarize the misunderstanding of driving recorder and experience the reading mode.

● The lens material on e-commerce is almost all glass, no difference?

Bian Xiao introduced the lens of driving recorder before, and the hard index parameters related to the lens mainly include wide angle, aperture, glass and distortion. In terms of lens material, glass lens is better than resin lens. However, I found that almost all the baby details pages of e-commerce platforms will be marked with "6G" when introducing the lens material, which is 6 layers of all-glass (which is a better lens material).

It is enough to read this article. Summary of misunderstandings in purchasing driving recorder

In order to improve the wide-angle and imaging quality, the driving recorder usually uses multi-layer lenses, but the disadvantage is that the multi-layer lenses will make the light loss as high as 30% to 40%. In order to improve the light transmittance, some high-end driving recorders will also use advanced optical lenses with multilayer antireflection films.

It is enough to read this article. Summary of misunderstandings in purchasing driving recorder

How to distinguish between good shots and bad shots? Jerry-made lenses (coated with only one film) are usually blue-purple or red under illumination, while lenses coated with multilayer antireflection films are light green or deep purple. (For reference only)

● There are pits! If it is Anba's product, it must be good?

Just search on the e-commerce platform, and most driving recorders will be marked as "Anba A7" chips. Indeed, at present, the main chip of driving recorder is Anba A7 series, and almost everyone knows that Anba is the best, so most products are using Anba series chips.

It is enough to read this article. Summary of misunderstandings in purchasing driving recorder

For this reason, some unscrupulous merchants began to play tricks, telling you to use Anba's chip on the baby details page, instead of telling you whether to use LA70 or LA50/LA55 or LA30 (Anba's A7 series is LA70, LA50/LA55, LA30). For such a product introduction, it is recommended that car owners pay attention.

● Photosensitive chips are often marked with dummy parameters.

At present, the mainstream photosensitive chips are OV4689 (4 million physical pixels) and AR0330 (3 million physical pixels). OV4689 is generally used in relatively high-end products, usually with LA70, which is the best top-level configuration at present. AR0330 is usually used with couplets 96650, LA30, LA50/LA55.

It is enough to read this article. This paper summarizes the misunderstanding of purchasing driving recorder. How many tens of thousands of pixels are used to describe the front-end sensor pixels, such as 1.3 million, 2 million, 3 million and so on. Video output is generally described by 720P, 1080P, etc. These are also two parameters directly related to the photographic clarity of the driving recorder (one is the pixel of the front sensor and the other is the clarity of the video output). However, sometimes we are often misled. There are tens of thousands of sensors, but actually the video output may not reach that many tens of thousands. These are completely two concepts.

● 1080P or 1296P?

1080P has almost become the standard now, so do you still need to choose a higher video output? A little knowledge is popularized here. For example, the number of pixels corresponding to the image of 1080P is exactly 2.07 million. How did you work it out? 1080P, namely 1920× 1080, which is equal to 2.07 million. If you count some waste things on the edge of the sensor, it may be only about 2 million. If the number of pixels is higher than 1080P, the data amount of pixels must be higher than 2.07 million. Assuming that the machine of 1080P and the machine of 1296P both use the same memory card, not only the video recording time is reduced, but also the repeated reading and writing times of the card are greatly increased, which will lead to a shorter service life of the memory card.

It is enough to read this article. Summary of misunderstandings in purchasing driving recorder

It is enough to read this article. Summary of misunderstandings in purchasing driving recorder

More importantly, in fact, if the pixel is higher (for example, higher than 1080P), the improvement of definition will not be obvious, but the night vision effect will be worse, because the average light entering each pixel is reduced. Therefore, the products of driving recorder should pay attention to practicality and durability, and not all parameters are as high as possible.

It is enough to read this article. Summary of misunderstandings in purchasing driving recorder

To put it bluntly, clarity is a comprehensive manifestation of product performance, which is mainly related to image processing chips, image sensors and lenses, not just the pixel values marked by chips and parameters. Some bad manufacturers will tamper with the lens. There is no difference between the chip and the image sensor, but in fact the lens has a great influence on the definition and night vision effect.

● Is it a good product to see the license plate clearly?

Even the 720P driving recorder can clearly see the license plate in front of it in a relatively static state, so the real shots of the "Baby Details Page" screenshots are mostly taken in a relatively static state, which is far from the real feasibility. Whether the license plate can be seen clearly is affected by the following factors: relative speed, relative distance, road smoothness, lighting conditions, shooting angle and so on. Generally, the recorder takes clear pictures of relatively static objects within 3 meters ahead without pressure. If there is displacement, even the best recorder may not be able to capture the license plate clearly.

It is enough to read this article. Summary of misunderstandings in purchasing driving recorder

When the displacement is controlled within 10% (empirical value), the license plate can be seen clearly, that is, assuming the size of the license plate is 60* 100mm, that is, the displacement range cannot exceed 60mm* 10%=6mm, and beyond this range, it will become blurred. The exposure time of most driving recorders is basically in the range of 0.05-30ms, the exposure time of shooting at night is basically 30ms, and the exposure time of shooting during the day will change with the change of light.