Projection Imaging Control Method Of Dot Matrix LED Intelligent Headlamp

With the development of society and the progress of science and technology,the popularity of cars is more and more widespread.While cars bring convenience to our life,they also induce many traffic accidents.According to relevant statistics,more than half of traffic accidents occur at night,and a considerable proportion of them are caused by incorrect use of lights.Therefore,a suitable headlight system can effectively avoid traffic accidents and improve the safety of road traffic.Car headlights are a very important basis to ensure the safety of people and vehicles in the process of driving at night,which is of great significance to avoid the loss of people and property.Nowadays,with the rapid change of optical electronics and automobile engineering technology,the control technology of intelligent automobile headlight has become a hot research topic in the field of spare parts.In this paper,the dot-matrix LED headlight system is taken as the research object,and the mapping lighting implementation mechanism of dot-matrix LED headlight is studied as follows:1.The test platform of dot matrix LED headlight system was built,and the main structure of the test platform as well as the construction of the supporting hardware platform and the design of the software platform were designed according to the actual system of dot matrix LED headlight.In this system,the upper computer interface developed based on MFC(Microsoft Foundation Classes)in PC is used as the controller of the system.With the help of CAN bus,the signal acquisition and control command transmission of dot-matrix LED headlight are realized.2.Aiming at the difficulty of adjusting and controlling the light field of automobile headlamp,according to the lighting requirements and luminous characteristics of automobile headlamp,the mapping relationship between the light array of automobile headlamp and the light field of vehicle front lighting was obtained,the light field model of dot matrix LED intelligent headlamp was established,and the experimental system test platform was used for functional testing.The results show that the proposed model is accurate,real-time,reliable and easy to implement.3.In order to improve the safety and comfort of Driving,the headlights will project high-definition warning/interactive ICONS and pictures on the ground in conjunction with the surrounding environment information provided by the Advanced Driving Assistance System(ADAS).Aiming at the problem of trapezoidal distortion of high-resolution warning/interactive ICONS and pictures projected on the ground in prior art,the following research scheme is proposed: First,according to the established light field model,the mapping relationship between the selected ground lighting area and the luminous array in the automobile headlamp is constructed,and then the coordinates of image pixels are corresponding to those of the luminous array to realize the reconstruction of coordinates.Then,the luminance value of the image coordinate is assigned to the corresponding coordinate of the luminescent array by bilinear interpolation algorithm,so that the image can be projected to the ground without distortion.Finally,it is verified by experiment.Experimental results show that the trapezoidal distortion can be effectively solved.4.When the car is driving at night,the lighting light of the car will direct the eyes of the people,causing blinding,temporary visual blindness,easy to induce traffic safety accidents.In order to protect pedestrians against blinding,a pedestrian antiblinding method based on light field transformation is proposed.Firstly,the front and side images of human body are captured by the camera,and the human features are extracted.On this basis,appropriate fitting function is used to fit the contour of human body.Then,according to the light field model of the headlamp,the position of the human body contour in the light field in the car headlamp is obtained in reverse to control the light array in the car headlamp,so as to realize the anti-glare protection for pedestrians in the front light field.Finally,the experimental system test platform built in this paper is used to verify the effect.Experimental results show that this method has good real-time performance and accuracy.