車載全景視覺系統(tǒng)的研究與實現(xiàn)
[Abstract]:With the rapid increase in the number of cars used in China, more and more traffic problems begin to be highlighted. Among them, the most frequent accidents are vehicle scratches caused by lane congestion and low-speed parking. The cause of the accident is largely due to the presence of a large number of blind areas of vision while the driver is driving the vehicle. The purpose of the vehicle panoramic vision system is to provide drivers with a top-down panoramic aerial view around the vehicle to help the driver eliminate the blind area of vision and thus reduce the occurrence of such traffic accidents. This paper mainly focuses on the research of vehicle panoramic vision system, introduces the imaging principle and distortion correction method of fish eye camera, designs the panoramic vision image processing algorithm, puts forward the acceleration method of the algorithm, and finally carries on the real vehicle experiment verification. And it is implemented on the embedded platform. Firstly, the imaging principle of the ideal camera and the fish-eye camera are introduced, and the difference and connection between the ideal camera and the fish-eye camera are analyzed. The distortion correction algorithm and the image interpolation principle of the fish-eye camera are introduced. The internal parameter matrix and distortion coefficient of fish eye camera are obtained by using Zhang Zhengyou plane calibration method, and the distortion correction of fish eye image is successfully realized. Secondly, the basic principle of image perspective transformation is introduced, and the method of finding the optimal perspective transformation matrix based on least square method is designed. Then the traditional image splicing method based on invariant feature is introduced, and the limitation of this method is analyzed. An improved image mosaic method based on checkerboard registration is proposed. Finally, the image fusion algorithm is used to eliminate the splicing seam due to the different brightness of the image. Finally, the embedded Linux operating system environment is built on the I.MX6 platform, and the Opencv is cross-compiled to the embedded system. Then a panoramic experiment is carried out on a real vehicle, and an algorithm acceleration method based on mapping idea is designed. At the same time, multi-thread technology is used to accelerate the algorithm, and the experiment is carried out on this embedded platform. The experimental results show that the method proposed in this paper has successfully realized the panoramic vision system and achieved the desired purpose, but the quality of the panoramic image needs to be further improved.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U463.6;TP391.41
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