摘要
针对锥面折反射的全景成像系统采集的圆柱内壁全景图像存在畸变的问题,提出锥面双向投影模型下的圆柱内壁全景图像展开方法。建立含有畸变参数的正向和逆向投影模型,先将圆柱内壁全景图像的像素点逆向映射到展开图像,再将展开图像中缺失的像素点正向映射到原全景图像,通过全景图像和展开图像对应像素点的坐标映射关系,实现圆柱内壁全景图像的展开。实验结果表明:该方法较好地校正了圆柱内壁全景图像的切向和径向畸变,锥面双向投影模型定位精度为亚像素级,相比同心圆环近似展开法,信息熵和平均梯度均有不同程度的提高,能够有效应用于圆柱物体内壁全景图像的展开。
Aiming at the problem of distortion of the panoramic image collected by the conical catadioptric panoramic imaging system, a panoramic image expansion method of inner surface of cylindrical objects under the conical bidirectional projection model is proposed. Forward and reverse projection models with distortion parameters are established, first, the pixels of the panoramic image of cylindrical inner wall are reversely mapped to the expanded image, and then forward the missing pixels in the expanded image to the original panoramic image, through the panoramic image and the expanded image corresponding to the coordinate mapping relationship of the pixels, the expansion of the panoramic image of cylindrical inner wall is realized. The experimental results show that the tangential and radial distortion of the panoramic image of cylindrical inner wall are corrected better, the positioning accuracy of the bidirectional projection model of the cone surface is sub-pixel level, comparing with the approximate expansion method of concentric rings, the information entropy and the average gradient are both improved to different extents, it can be effectively applied to the expansion of panoramic images of cylindrical inner wall.
作者
景文博
高雪峰
黄炳坤
李世涛
于洪洋
Jing Wenbo;Gao Xuefeng;Huang Bingkun;Li Shitao;Yu Hongyang(School of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun,Jilin130022,China;Jiangsu North Huguang Opto-Electronics Co.Ltd.,Wuxi,Jiangsu214035,China;The 55th Research Institute of China Electronic Technology Group Corporation,Nanjing,Jiangsu210016,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2021年第3期83-92,共10页
Acta Optica Sinica
基金
科技部项目(2018YFB1107600)
吉林省科技厅项目(20160204009GX,20170623004TC,20170204014GX)。
关键词
成像系统
锥面折反射全景成像
正向投影
逆向投影
全景图展开
imaging systems
catadioptric panoramic imaging of cone
forward projection
reverse projection
expansion of panorama image
