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1. Basic functions:
1. main control scheme: the core of the dash cam is master control. At present, the mainstream control scheme is composed of security hegemony, outstanding, United chanting, Tai Xin. The performance of the scheme is the most stable (but it is heard that the 96650 in and the 96650 of the market is more cost-effective than a bully), and the high-end products are all adopted at present. Zhuo is located in the middle-end products, but there are very few products on the market. Lian Xin is a low-end machine dedicated solution, and the price is very cheap. It is more difficult to distinguish what plan cannot be disassembled, but there is a simple way. At present, the video format for MOV is designed to use an anti-bully scheme (the top end is JS, the blue light format), the MP4 is a brilliant scheme, and the AVI is the wing or Tai Xin scheme (now the 96650 is moved format). First, ask the video format to record the price of the product.
2. shooting angle: the deformation degree of wide angle and shooting pictures always concomitant with each other. The larger the wide angle, the more serious the deformation of the picture. More than 90 degrees will begin to deform. The cost of increasing the wide angle and solving the technical problems of the screen deformation is increased at the geometric level. Without affecting the quality of the picture, the current top product can only be 140 degrees wide. The wide angle of 150 degrees or even 170 degrees will greatly distort the picture, but for the dash cam, the large wide angle is more favorable for driving forensics.
3. video picture quality: more than 720P can be called HD. 720P can make the number of the license plate in 3 meters, and 1080P can take the license number of the 10-meter distance. The cost of 1080P is much higher. There is a simple way to judge the quality of the picture, and compare the file size of the video in 5 minutes.
4. never leak seconds: from the angle of recording the security of the video recording, it is different from the continuous video of the ordinary household DV. The video recorded by the recorder is automatically saved every few minutes (time can be customized). This is particularly important in the interval between the two segments of the video. The performance of product processors and the speed of inserting flash cards are very high, and these are cost related. I have measured that the interval between two videos of Shanzhai products will be more than 2 seconds. For a machine that has missed seconds, it is not necessary to buy, and the important data may be in the one second that is missing.
5. see whether the picture is fluent: People's eye vision remains the presence of the presence of the image, to see a continuous flow of the picture, the most basic requirement is the speed of recording pictures per second more than 24 frames, a lot of Shanzhai products per second rate of only 15 frames, the speed of human eye may not be very obvious, but at the same time, When playing the important moment, the picture is very poor. At present, the speed of 30 frames per second must be the standard configuration of the recorder, to calculate how far the distance can be run per second at high speed, and then calculate the distance between 1/15 and 1/30 respectively. At present, there are 60 frames per second at the speed of high-end products. This data is the level of Sports Camera. There are many sellers who record the car on the street with the recorder. The effect is clear because there is no load on the car, the car is at high speed, and the front windshield has some reflection. So it's better to see the real thing. The effects on the car are recorded and recorded in a variety of different light. (but of course, some people have a computer player card that causes the recorder to play the carton, which can only be suggested to change the computer.)
6. night vision effect: the night vision effect refers to the product low illumination performance, the excellent product has the WDR wide dynamic acquisition control unit, can carry on the two sampling and recording to the bright and dark part, then integrates, thus achieves the bright and dark part clear picture effect.
7.WDR/HDR wide dynamic: low-end products encountered strong light, light, weak light, when the image came out very black, touching the white things, and recorded too bright, this is the white balance do not do well. There is a brand product publicity, "license plate non-reflective" performance is excellent white balance performance. Improving this performance also depends on the speed of the photosensitive chip processor, which can not be achieved by the low-cost machine. When it comes to reflective light, even if the white balance is good, the recorder will cause a negative reaction if it is irradiated by strong light. But some time ago, I heard a friend say that the problem should be reflected in the lens of the recorder with a polarizer.
8. safety first: the market is now sold from dozens to more than 3000. Most cheap machines are mostly built in lithium batteries, which are extremely unsafe, because the recorder is hung on the windshield of the car, often exposed to the sun, and working continuously, the temperature is very high, no matter what kind of lithium battery, is afraid of high temperature, even if It is said to withstand high-temperature lithium, but it is not absolute insurance. In the choice of power supply, it is necessary to use a supercapacitor or a polymer battery-powered machine, which is much safer than lithium.
9. whether the recording can be closed manually: if you can't shut down, it's not good for the privacy of the car. It's all recorded. It may be embarrassing. It's better to have a manual one to turn on / close the tape.
10 whether the screen can be automatically closed: if the screen is always bright, it will affect the life of the screen first, and the heating will also affect the overall life of the machine. More importantly, driving at night, the screen will always interfere with the driver's line of sight to bring security risks.
The structure and material of the 11. support: when the road condition is not good, with the vibration of the car, the recorder may produce a common shock, and the bad frame will shake strongly and cause the blurred image of the recording. The only way to solve the coseismic problem is to shorten the length of the support and increase the strength of the scaffold. Some manufacturers even adopt the sticker design to solve the coseismic problem.
12. cycle Video: limited by memory capacity, and the space occupied by the video is very large, the current largest 32G flash card 1080P definition video can only save about 7 hours or so. After full storage, the dash cam will delete the earliest videos by itself, leaving room for the new video. The circular recording function is the most basic function of dash cam, which is different from ordinary DV and cellphone video recording.
13. emergency video and G-sensor collision automatic emergency Video: Based on the characteristics of the recorders of the previous recorder, if an image is important, but the later video will be photographed, then the important video in front will be deleted automatically. In this case, an emergency video is designed. If you have an important impact, just press a key manually, it will force the video to be saved without being deleted automatically when the card is full. The automatic emergency video is the use of a gravity sensor, which automatically protects the video from being deleted when monitoring the vehicular vibration. This function will have a good use when the vehicle collides.
14. do not interfere with other automotive electronics products: Shanzhai products do not take any shielding measures to reduce the cost of design, without strict testing, it will interfere with GPS navigation, remote control, sound, tire pressure meter and driving computer and other automotive electronic products, in case of situation, the impact is huge.
15. the way to get electricity: even if the battery in the built-in battery recorder can only record a very short time, usually not more than a few dozen minutes. In addition, it is necessary to identify vehicle startup and flameout, because some dash cam needs to connect ACC power supply of the vehicle. The general design is to plug in the car's smoke device to take electricity, this is very simple, but the cigarette holder only one, and now need to pick up the device from the smoke device is too much, such as smoke device, portable navigation, charger and so on. At this time, you need to take the wire of the recorder to the front end of the smoke detector, no longer occupy the socket, but all the working voltage of the recorder is only 5V, and the voltage of the car needs to be converted from 12 or 24V to 5V. The excellent product integrates the voltage variable module in the inside of the recorder or near the end of the recorder so that the user will be allowed to cut the plug of the smoke device to the ACC power supply without taking up the socket.
16. whether to match the card: This is a detailed problem, a lot of buyers do not pay attention because the video recorder recorded by the vehicle is very huge, high definition video up to nearly 100 megabytes per minute, so the speed of memory card writing is demanding. Low-calorie calories will cause the crash. Domestic commercial flash cards are mixed up, with the same card, high-quality chips can be erased more than 100000 times, poor quality can only be about 2000 times. It is not easy for ordinary people to buy cards that meet the requirements of the dash cam. Therefore, the large brand of vehicle data recorder manufacturers will be equipped with high-speed cards when shipped. Therefore, the flash card is best protected by the same vehicle recorder.
Two, characteristic function:
With the development of technology, in addition to the basic functions of the vehicle video recorder, some other functions have been added to the vehicle recorder products, and the users can choose according to their own needs.
1.GPS track record: this function not only records the traffic image, but also records the GPS coordinates of the image, and with the Google map, it will show a complete route trajectory. Personally, it is very practical for the car friends who like to travel. In addition, the product with this function will also have the function of automatically adjusting the time of the recorder, without human setting time, very accurate, GPS time, believe in the United States. Some dash cam products make this function a plug-in option, and you can choose this function according to your own needs.
2. fixed velocity measurement reminding: the target of fixed measurement early warning is fixed speed limit section and fixed red light taking pictures. The positioning data obtained by GPS positioning are compared with the data of the speed of storage and the latitude and longitude data of the photographic point, so no matter whether the electronic police work or not, it should be warned. Electronic data needs to be updated and updated continuously. This kind of speed measurement is legal in China, and the relevant departments will regularly publish the set point data, and will set up a sharp reminder sign in front of the setting point.
3. flow velocity radar velocity measurement: This is a profit radar detector. Detection of radar waves will automatically remind you that in some places the purpose of speed measurement is to create a fine, not for safety, and not for safety. There will be a lot of traps to punish your money, such as a speed limit of 50 kilometers on an unmanned high quality highway and a tachometer in a green belt. Punish your money, then use this function to deal with them. This function is still in the set of gray areas, part of the area allowed to install, if Beijing, Shanghai and other developed places, because these places are relatively standardized, traffic jam is serious, and it is difficult to overspeed. And part of the place is prohibited to install, the single function of the product will be seized and fined after being caught, but the vehicle recorder can be installed, when the recorder is equipped with this function, as long as you do not say it will not be known.
4. front car collision warning and lane departure warning function: the two functions are integrated into active security technology, and the vehicle video is only recorded on the events that have occurred, which is not conducive to the active safety. The front car collision warning function is that the recorder calculates the relative speed with the front car through the real-time processing of the intake video image, and then draws the time that the driver will follow the tail when the driver does not take measures. When the driver is less than 1 second, it will give a sound warning warning. Lane departure warning is the same as the principle of vehicle collision warning. It also uses image processing to make voice prompts when deviating from the lane. These two functions may play a great role in driving a person to answer the phone, to smoke, to chat and to be sleepy. But these two functions are basically image processing, so the effect at night is very general. In the high-end cars, such as Volvo, Benz, BMW, Audi and other parts of the car with these two functions, the price is more than more than 20 thousand higher than not, when I see the car recorder can also two functions can only exclaim that the high profit is too high. I'll try to get you to buy high gear with a low profile.
5. connection with the vehicle OBD, record oil volume, engine rotation, speed and other driving data: the product of this function has appeared abroad, domestic (of course, Taiwan) has not been produced and sold temporarily, but it has been developed by some manufacturers. The product has already been shaped, and it needs to be marketed before the product concept is rotten. A car friend always likes to wait for the latest functions to come out and buy again. In fact, he can never wait for the ultimate product, otherwise, the manufacturer will eat something and feel good.
6.GPS navigation: chicken ribs, not to mention it. Smart phone is free to install a navigation software, the navigation function may not be used a few times a year, and at the top of the top product integrated navigation function, the highest definition is only 720P, and the cost to increase more than 2 times, you buy a recorder or to buy navigation? The demand for navigation is not within the scope of our discussion.
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