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Which is more reliable, reversing camera or radar? How to operate more safely when reversing?
2022-08-11 Author:BRVISION

Which is more reliable, reversing camera or radar? How to operate more safely when reversing? Authoritative measurement: reversing imaging + reversing radar, the effect is not as good as only reversing imaging. This may not seem like a scientific conclusion, but in fact, it is very scientific. That’s data from the Insurance Institute for Highway Safety (IIHS), a leading agency. Reversing the car is a headache for both novice and some old drivers. There is a large area of visual blind spot at the rear of the car. When reversing, you can only "blind" and accidentally hit something or even crash. Old people and children, causing tragedy.

Reverse image

At present, the safety equipment to solve the blind spot of reversing vision mainly includes reversing radar and reversing image. I’m sure most readers are already aware of both cases, but I’ll give you a little bit of science first. What is a parking radar? The scientific name of the reversing radar is the reversing anti-collision radar. It calculates the distance of obstacles by sending out ultrasonic waves from the radar probe, and then sends out different frequency alarms to the driver according to the distance, helping the driver to better control the parking position.
What is its inverse? The reversing image is filled with the reversing vision system. With digital display + voice prompt + real scene display + night vision + car multimedia functions. Through the rear camera, all obstacles in the field of view can be seen on the central control screen, allowing the driver to better understand the situation behind. How many problems can these two devices solve? The IIHS, an authoritative testing agency in the American auto industry, conducted a special test.
Inverting the image can reduce blind spots by 90%. The test is divided into two parts. The first part is to test how big the blind spot is when backing up. Twenty-one male drivers took part in the test, and they drove different cars. During the test, the pillars were placed in various positions on the rear of the car. At the top of the column are three layers of rings of different colors, representing the three heights for children aged 1-6.

The three rings of different colors represent the heights of children aged 1, 2 and a half to 3 and 5 to 6 years old. The results showed that the pillars were not visible from an average distance of 8 meters from the rear of the vehicle when viewed with the naked eye only from the rear-view mirror or rear window. In general, the bigger the model, the bigger the dead zone. If the reversing image is used, the blind spot can be reduced by about 90%. The blind spots of the reversing image are mainly concentrated near the sides of the rear of the vehicle.

Reversing radar

Reversing radar can detect obstacles at a certain height, but the detection range is limited, limited to the close range of the rear of the vehicle (generally no more than 1.5 meters). The detection distance of the parking radar is relatively small. Reversing radar, combined with reversing imaging and rearview mirrors on both sides of the car, can basically eliminate the blind spot behind the car. The left and right mirrors, reverse mirrors, and anti-radars are all in place, so there is only a little blind spot left (the white part in the picture).
The opposite image is invalid on radar. The second part of the test was to test how people used reversing images and radar in the field to see how effective they were in practice. The test was conducted like this: After the volunteers drove to the test site, they were told to test the car’s multimedia system (the actual test items were hidden to prevent them from noticing how to reverse the car).
Then, the volunteers drove the car to a designated parking space for testing; finally, the volunteers backed out and drove the car back to the original place. Before reversing, child-sized test dummies made of Styrofoam were smuggled into the path of the reversing vehicle. In some cases, the test dummy was placed in the back of the car; in other cases, the dummy was moved from behind the car on the driver’s side to directly behind the car.
The results showed that 93.75% of the people hit the dummy; in the car with the reversing image, the proportion of the collision dummy was 56.25%; the probability of hitting the dummy was 75% for the car with both the reversing image and the radar. This test result is not surprising, most people might think that the combination of reversing image and radar would be more reliable, should be explained that the reversing radar is not so incompetent.
In fact, many volunteers heard the siren but were slow to react and ended up hitting the dummy anyway. In this case, radar can mitigate the consequences of an accident. The strange thing about this test result is that the car with both the reversing image and the radar installed is less efficient than the car with only the reversing image. Why is this? The researchers at IISH explained that this was because the volunteers blindly believed the influence of the radar and did not observe the reversing image carefully enough, thus weakening the effect of the reversing image.

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