Design Of Electronic Racemization System Based On FPGA

With the upgrade of automobile performance,the requirements for stable tracking performance of in-vehicle imaging equipment are also increasing,car image stabilization technology continues to improve.For some car image stabilization systems that only have horizontal and pitch stabilization functions,it is not possible to eliminate the rotation of the video picture caused by the left and right shaking of the vehicle.This paper proposes an FPGA-based real-time image electronic derotation system.This core processor of the real time image processing system is EP4CE15F23C8 N.The OV5640 CMOS camera is used as the source to collect images.The FPGA collects the WT61 C gyroscope data fixed on the camera through the serial port.The trigonometric function value of the rotation angle is obtained by the lookup table and is processed by the internal derotation module.The captured image is stored and read and written by DDR2 SDRAM,and the de-rotated image is displayed in real time through the VGA interface.The Verilog hardware description language is used to implement the entire de-rotation algorithm and the code design of each module.The inverse mapping method is used to inversely rotate the image to the corresponding angle.First,the coordinates of the first pixel after the extinction are calculated,and then the coordinates of the other pixels are accumulated by the optimized algorithm,and finally the image is obtained by the nearest neighbor interpolation method.Interpolation is performed to obtain an image after the racemization.The main contents of this paper are as follows:(1)According to the system tasks and indicators,the hardware platform of the whole system is built.(2)Optimize the traditional image rotation algorithm,analyze the interpolation algorithm and carry out simulation experiments,and propose a fast de-spin algorithm that can be implemented in FPGA.(3)Complete the design of the firmware and software of each module to realize the design of the whole system.The effect of the racemization is analyzed.The experimental results show that the system can collect and real-time the 640×480images,and the images after the de-rotation are clear and stable,meeting the parameters requirements of the system and the real-time requirements of the system.