Three standards for measuring the quality of driving recorder products
The driving recorder not only helps to provide a credible evidence in the traffic incident, but also facilitates the traffic police's responsibility and insurance company claims, and also plays a role in cultivating good driving habits and allowing drivers to obey the traffic rules. The cost of retrofitting with the on-board recorder is much lower, making it one of the standard configurations for home and passenger cars, taxis, and buses.
With the rapid increase in the number of car ownership in China, the frequency of road traffic incidents has risen, and more and more private car owners have begun to pay attention to video forensics, which has also promoted the development of the driving recorder market. The driving recorder not only helps to provide a credible evidence in the traffic incident, but also facilitates the traffic police's responsibility and insurance company claims, and also plays a role in cultivating good driving habits and allowing drivers to obey the traffic rules. The cost of retrofitting with the on-board recorder is much lower, making it one of the standard configurations for home and passenger cars, taxis, and buses.
Driving recorder emphasizes environmental adaptability
In development, the main problems that the driving recorder needs to solve are: reliability and low power consumption, clarity, night visibility, picture quality, color and multi-view application requirements.
Reliability comes from high-quality product components, especially DSP main chips, memory and image sensors. The driving recorder is usually installed in the middle of the front windshield of the car or on the back of the rear view mirror. These installation locations can be as high as 90 ° C in the summer when the sun is shining directly. The chip is packaged inside the drive recorder box and the surface temperature is higher. If the core components such as DSP appear unstable, deadlock, automatic restart and other faults at high temperatures, it will directly lead to the loss of video image data. However, the temperature range of civilian consumer chips is usually between 0 and 70 ° C. Therefore, it is difficult for civilian consumer products such as mobile phone chips to be directly used in driving recorders. Industrial grade products with a wide temperature range are required to have good reliability. Guarantee.
At the same time, low power consumption is often a guarantee of reliability. Generally speaking, the size and installation limit of the driving recorder are strict. In a small sealed casing, if the internal chip consumes a large amount of power, it will cause severe heat generation and heat up rapidly, so that the temperature is high, CMOS The noise of the sensor increases, and too high temperature may cause components such as DSP, memory, and CMOS to malfunction.
Secondly, in terms of image quality requirements, 1080P and above pixels have gradually become the mainstream in the market. Since the driving recorder generally uses a super wide-angle lens, the distance of the front-end car in the field of view is smaller than that of the human eye or the mobile phone, and the video of higher definition (such as 2304x1296/1296P and 2560x1440/1440P) will be significantly improved. Picture clarity is more conducive to video forensics. If it is displayed on the 1080P monitor, it will be very sharp due to the oversampling relationship. In addition, color accuracy and automatic white balance accuracy are also key elements. At different times of the day, and under the influence of different light in the environment such as tunnels and overpasses, you need to adjust the color settings and white balance settings at any time. Good image quality and color not only increase the credibility of video evidence, but also increase itself. The screen is also more pleasing to the eye.
Of particular concern is nighttime visibility performance. The night illumination is low, the noise of the CMOS sensor is too large, the video is easy to be blurred or mosaic; in addition, the brightness of the night lights and street lights is much higher than that of the road surface, and it is easy to cause the road surface recognition when the vehicle appears on the opposite side, or When the car's headlights hit the front of the car, the license plate is overexposed and unrecognizable. To solve these problems, not only need to support low-illuminance good CMOS image sensor, but also DSP support high dynamic function, which can reduce video noise, suppress strong light, and improve road visibility.
In the current development of the new driving recorder, more emphasis is placed on the use of powerful functions. For example, not only single-channel, but also support two-way video, both for front view and rear view when reversing; some can also be used to monitor drivers to prevent fatigue driving; some can also support 360-degree viewing , extending security to full viewing angles. The problem to be solved by multiple viewing angles is to increase the coverage of the video, especially the reversing video, body looping video, etc., which are usually mainly used in medium and high-end configuration vehicles or super long passenger cars, and the driving recorder supporting two-way video is also Can be equipped with video recording.
High-end driving recorder, bid farewell to low-priced 720P and cheap 1080P
In the development of the overall solution of the current driving recorder, the market competition mainly focuses on two aspects: First, the low-cost 720P and the cheap version of the 1080P solution, the final product price is lower, but in the power consumption, image quality, clarity There is a discount on visibility and night visibility; the second is to use the tablet technology solution, based on the Android customized system, to provide some entertainment and simple intelligent accessory functions on the desktop user interface, but the image and video effects of the main DSP Similar to the tablet, the driving recorder is not optimized. At present, driving recorders from two angles will have a certain share in the low-end and special markets, but they lack impact on the mid-to-high-end market and the user experience is not good.
In the high-end market of driving recorders, it is necessary to select a high-reliability main chip, to be able to adapt to a wide temperature range, to have as low a power consumption as possible, and it is preferable to have a mature product with a large market share. For new products, it is best to use sensors with more than 4M pixels to improve the definition, and support high dynamic functions, DSP noise reduction function is also good, for some special needs, you should also choose to support dual video, provide reversing assistance, and line Additional functions such as auxiliary and front car alarm lights. Take the technical solution developed by Anba as an example. At present, the A7L series is the mainstream high-end solution in the market, and the A12 series is a new generation of high-end solutions.
Upgrade capture camera pixel boost forensics persuasion
In addition to the driving recorder, the demand for the capture camera used by the traffic management department is also growing. As the pixels of the CCD sensor increase, the resolution of the camera rises rapidly from the previous 1080P to 5M, 8M or even higher, which makes the camera can make the photographed vehicle more clear, which is conducive to the persuasiveness of the image evidence, and The high-pixel CCD capture camera can cover more lanes, which not only reduces the installation cost of the equipment, but also achieves the same effect in capturing illegal vehicles.
Looking into the future, professional traffic capture cameras may move toward high-pixel, global exposure CMOS, intelligent, etc., which will help improve picture quality and increase the deterrence of law enforcement forensics. Night-time capture-assisted illumination may evolve toward high-speed visible-light sync strobes or even infrared strobes, replacing the current single-shot or continuous illumination. The driving recorder needs to add more Internet data uploading functions. For the personal use of the driving recorder, it may be possible to upload some short films or pictures of key points to the cloud to achieve big data backup, and also propose speed warning and routing strategies according to individual driving habits and routing. When parking outdoors at night, battery-powered surveillance cameras may be required to trigger photo recordings based on surrounding sounds or PIRs. This battery-powered surveillance camera can be integrated with the driving recorder. .
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