In the process of purchasing driving recorders, we will encounter more or less tangled issues. Xiao Bian has been repeatedly asked whether it is better to choose products with higher pixels. My driving records Instrument has wifi function, but there is no display screen, this is convenient to use? What brand of recorder is better? So, I will simply come to a summary, the recent number of traffic recorders often mentioned come out.
â— Almost all lens materials used in e-commerce are glass. No difference?
As for the lens of the driving recorder, Xiao Bian had previously introduced it. The hard index parameters related to the lens mainly include: wide-angle angle, aperture, glass, and distortion. In the lens material, the glass lens will be better than the resin lens, but I found that almost all e-commerce platform baby details page will be marked as 6G when introducing the lens material, which means that 6 layers of full glass (is a better lens material ).
In order to improve the quality of wide-angle imaging and imaging, driving recorders generally use multi-layer lenses. However, the disadvantage is that multilayer lenses can cause light loss of up to 30% to 40%. In order to increase light transmittance, some high-end driving recorders are used. Multi-layer antireflection advanced optical lenses will also be used.
How to distinguish between the quality of the lens? The cut-throat lens (single-layer film only) will usually be blue-violet or red under light, and the multi-layered anti-reflection lens will be light green or dark purple. (for reference only)
â— There is a pit! Is Aba's product certainly good?
A search on the e-commerce platform, most of the driving recorder will be marked with the security A7 chip. It is also true that the main chip of the current driving recorder is the A7 series of Ambarella, and almost everyone knows that AMB is the best, so most products are using AMD's series chips.
Because of this, some unscrupulous merchants began to play tricks. In the baby details page, you tell us which chip you are using, but do not tell you whether you use LA70 or LA50/LA55 or LA30 (Anba's A7 series. High, medium and low are LA70, LA50/LA55, LA30). For such a product introduction, it is recommended that owners leave their eyes.
â— Photosensitive chips are often labeled with virtual parameters
The current mainstream sensor chips are ov4689 (4 million physical pixels) and ar0330 (3 million physical pixels). OV4689 is generally used on relatively high-end products. It is usually paired with LA70 and is currently the best top-level configuration. The AR0330 is usually used in conjunction with Nissan 96650, LA30, and LA50/LA55.
The front-end sensor pixels are generally described by how many tens of thousands of pixels, such as 1.3 million, 2 million, and 3 million, and the video output is generally described as 720P, 1080P, and the like. This is also the two parameters that are directly related to the sharpness 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 misguided. The number of sensors is tens of thousands, but in fact, the video output may not be able to reach so many thousands. This is totally two concepts.
â— 1080P or 1296P?
1080P has almost become the standard nowadays, so does it need to choose a higher video output? There is a small amount of knowledge here, for example, the number of pixels corresponding to the 1080P image is exactly 2.07 million. How is it calculated? 1080P is 1920×1080, which is equal to 2.07 million. If you count some of the sensor edge wasted, it may only be about 2 million. If the pixel is higher than 1080P, the data volume of the pixel is also necessarily higher than 2.07 million. It is assumed that both the 1080P camera and the 1296P camera use the same memory card, which not only reduces the recording time, but also greatly increases the number of times the card is read and written. , will lead to shorter life of the memory card.
More crucially, in fact, the pixels are higher (such as higher than 1080P), and the rise of the sharpness is not very obvious, but the average night-to-night reduction in the brightness of each pixel will cause the night vision effect to deteriorate. Therefore, driving recorder products should focus on practicality and durability. Not all parameters are better.
To put it plainly, sharpness is a comprehensive manifestation of product performance, mainly related to image processing chips, image sensors, and lenses, and not just to see what chip and parameter-labeled pixel values ​​are used. Some unscrupulous manufacturers will make gestures on the lens, and there is no difference between the chip and the image sensor. However, in fact, the lens has great influence on the definition and night vision effect.
â— Is it a good product to be able to see the license plate?
In the relatively static situation, even the 720P driving recorder can clearly see the front license plate, so the real shot screen shot on the baby details page is mostly taken in a relatively static state. A certain gap. Can you see if the license plate is affected by the following factors: relative speed, relative distance, road surface roughness, lighting conditions, shooting angle, etc. It is no pressure for the general recorder to take a picture of a relatively stationary object within 3 meters in front of it. If there is a displacement, no matter how good the recorder may be, it may not be clear about the license plate.
When the displacement size is controlled within ±10% (experience value), the license plate can be seen clearly, that is to say, the license plate size is 60*100mm, ie, the displacement range cannot exceed 60mm*10%=6mm, and if it exceeds This range will also become blurred. The exposure time of most driving recorders is basically within the range of [0.0530ms]. The exposure time for shooting at night is basically 30ms. The exposure time taken during the day will change with the light.
â— What does the sucker always love?
If the product is small in size, and does not have to be taken off later, the 3M adhesive fixing method is more convenient. For example, if you use the APP to view the playback product, you can directly select the 3M adhesive product. If you need to remove the product to view the playback video, then 3M adhesive will not be too sticky in the second time, you need to replace the new one.
However, it was also reported that the suction cup fixing method would be less stable and could easily fall off. Here are some simple ways the netizens introduced: Go to the building materials store to buy a high-transparent glass of plastic (about 13 yuan), wipe the front windshield and suction cup first, and then in the center of the suction cup, point a half peas The size of the high-transparent glass glue is glued to the front windshield (completely transparent and without traces). After 24 hours of glass glue drying, add a driving recorder. When clearing, it is easy to remove the sticky sucker with the blade of the wallpaper knife and close to the glass.
â— The most suitable 32G memory card
Of course, the bigger the card, the better, but if it is enough, 32G is enough. For example, if you just go to work, about the daily driving time is 90 minutes, 32G card can record 320 minutes of full HD video, video recording can save about three days (in the absence of emergency video space), This is enough for most people.
In addition, the quality of the card is very important. I mentioned in my previous question about driving recorders. Sometimes problems with the camera (such as missing seconds) are related to the card. In order to keep up with the reading and writing speed of high-definition video, it is best to choose the class10 card. The Sandisk Red Series is recommended here (can work from -25oC to 85oC, adapting to the recorder's working environment).
â— Summary
The choice of driving recorder is not limited to this. At the time of writing such articles, they also got feedback from some car owners. You tell me directly what brand is good and which series is good. However, in order to avoid the suspicion of soft-text, I do not say which brand here, from the price point of view, 1080P driving recorder, the price is more reliable in the 300,500 yuan, and more than 600 yuan is the high-end products, these products With other functions such as GPS. However, in my opinion, a single recording function is sufficient, so if it is my choice, 400 yuan brand products can definitely start (during the event, the price is even lower).
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