1, Wikipedia card
lane departure warning basic components: an image processing chip, control, communication device.
The smart system provides a lane departure warning, when the unconscious (driver does not turn signal) offset from the original lane can alert 0.5 seconds prior to departing from the lane, to provide additional reaction time of the driver, greatly reduced due to lane departure crashes caused, in addition, the use of LDWS correct driver can not fight the habit of turning lights, the system is its main function is to remind fatigue or resolve long monotonous driving situations caused by inattention .
2, English business card
Lane departure warning system referred LDWS
3, Background
lane departure warning Background The (USA) the Federal Highway Administration estimates, 200,244 US in the percentage of all fatal traffic accidents are related with the lane departure while lane departure mainly due to vehicle rollover accidents also be considered. The results AssitWare website that: asleep at the steering wheel at least 23 percent motorists once a month; 66 percent own a truck driver while drivingDuring sleep; percentage of 28 truck drivers have fallen asleep at the steering wheel experience in a month. Four have a driver in the driver experienced casualties caused by lane departure.
4, principle and function
According to the definition (U.S.) National Highway Traffic Safety Administration, lane departure warning system is meant a way of assisting the driver by an alarm or reduce the lane departure avoiding accident systems. A lane departure warning system does not try to control the vehicle to prevent a collision may occur. The National Highway Traffic Safety Administration launched a “intelligent vehicle road system measures lane departure avoidance warning project” vehicle departure warning system is divided into “vertical” and “horizontal” lane departure warning two main functions. Longitudinal lane departure warning system that is mainly used for the prevention or the direction of speed is too fast because the lane deviation caused by uncontrolled collisions, lane lateral lane departure warning system is mainly used for the prevention and since the driver inattention of the driver caused by the steering operation to abandon deviation collision.
5, visual classification system
lane departure warning systems have been used commercially products are based on visual systems, depending on the installation position of the camera, the system can be divided into:
system side – a camera mounted on the vehicle side, obliquely directed lane;
the system front view – mounted camera front of the vehicle, pointing diagonally in front of the driveway.
system or whether it is a side view of the system before, by sensing the state of the road and the vehicle, the lane departure evaluated three basic algorithms and signal display module interface components. First, the system through the state sensing module sensing road geometry features and dynamic parameters of the vehicle, and the lane departing from the evaluation algorithm of evaluation of the possibility of lane departure is performed, when necessary, an alarm signal to the driver through the display interface. [12Category 3]
6, early warning systems
Foreign lane departure warning system
1.AURORA system
The system is US Robotics Institute of Carnegie Mellon University in 1997 the successful development of the child. The system comprises a color camera with a wide-angle lens, and a portable digitizer SunSparc workstation components. The system is installed in a vehicle through the field of view about a top side of the color camera detects the vehicle lane markers next to 1.5m 1.6m-region, captured video camera output through the digital converter and processed on a portable workstation SunSparc processing speed to 60Hz.
2.AutoVue system
The system jointly developed by DaimlerChrysler Corporation and former US Iteris company. The system consists of a camera mounted on the rear windshield of an automobile, consisting of two stereo speakers, a small display device and a control unit or the like. The system works in real time by monitoring the position of the vehicle in the current lane, the vehicle calculates the distance to the lane mark, and then compared to the alarm set distance, determines whether warning. Upon detection of lane departure will occur, it will rumble sound emitted when driving on long vocal cords a similar vehicle to alert the driver of the vehicle position correction. Currently, AutoVue system has been equipped as an option on a variety of trucks in Europe.
3.Mobileye_AWS system
The system was developed by Mobileye is headquartered in the Netherlands company. The system is installed on the windshield using a single camera monitoring the front of the lane mark, measuring and monitoring the distance between the vehicle and the road boundary. The lane departure warning system, road boundary detection module calculates the position of the vehicle relative to the lateral movement of the vehicle and the lane, the predicted vehicle lane identification traverse time, when the time is less than the set value, the system is triggered and visual warnings audible warning to the driver to make appropriate for different risk statesThe reaction to reduce the occurrence of accidents. The system lane departure conscious, without braking and road signs, etc. to produce a warning can be suppressed.
4.DSS system (DriverSupportSystem)
The system proposed by the Mitsubishi Motors Corporation in 1998, and in the fall of 1999 to the model car. The system consists of a small CCD camera mounted in a rearview mirror of the car, and some sensors detect the state of driver’s operation of the vehicle behavior, and visual and audible warning device. The system uses the vehicle obtained by the CCD camera in front of the lane mark, the other vehicle information acquired by the sensor data and the operating state of the behavior of the driver and the like, it is determined whether the vehicle has started departing from the lane. If necessary, the system will use visual warnings, audible warning and the vibration of the steering wheel to alert the driver to drive the vehicle carefully.
country lane departure warning system
1.JLUVA-1 system
The system was developed by Intelligent Vehicle Jilin University research group. The system is based on the front view monocular vision system, mainly by vehicle power, embedded computer, a display device consisting of black and white CCD camera, the data lines, speakers and an image acquisition card.
system uses a road image in front of the CCD camera installed at a position to acquire car rearview mirror, obtaining the current vehicle position in the lane parameter by image processing, when the car upon detection of the white line from the own lane too close there may be biased into the adjacent lane and when the driver did not hit the turn signal, the system will issue a warning message to remind drivers to pay attention to correct this unintentional lane departure, reducing as much as possible lane departure accidents.
2. Departing from the lane based on DSP embedded alarm system
The system developed by the Southeast University, is based on the front view monocular vision system, by the analog / digital conversion module and a decoding circuit, a buffer circuit module, a media processor (DSP) circuit module, encoding and digital / analog conversion circuit module modules. The system acquires analog video signal is tracked by the lane line vehicle camera, the decoded rawInto a digital signal stream to the high-speed DSP processor buffered media video interface, then the lane extracted feature value of the digital video signal by the video processing module, and finally the processed video signal encoding and transmitting digital / analog conversion circuit output display.
7, departure warning system development
studied early warning system
lane departure focused on the lane departure warning system based on vision. However, from the existing technical level, the most important factor affecting vision-based lane departure warning system reliability is the impact of weather conditions and illumination system application changes, this is all based on one of the main challenges currently facing the visual system. At present, a variety of robust, able to adapt to all kinds of weather conditions, to overcome the effects of light and shadow conditions change lane departure evaluation algorithm is all vision-based lane departure warning system trends.
vehicle active safety as well as some of the status of the development trend of domestic traffic based active safety electronics in the industry gradually form an independent system, many domestic automobile industry and more people are concerned, it is also active in research and development , China is now only a small part of the company’s lane departure system development more perfect, and the formation of an independent industry, like lane departure system on the market means that China has entered a new era of automotive active safety.