摘要
提出了一种非球面鱼眼镜头的设计方法,根据全景摄像系统镜头使用要求,设计得到一款仅由三片非球面塑胶镜片和一片球面玻璃镜片组成的超广角鱼眼镜头。镜头最大成像光圈直径为15.3 mm,后工作距离为2.158mm,系统总长为11.44mm,焦距为0.97mm,视场角为210°,在60lp/mm处调制传递函数(MTF)曲线达到0.35。还构建出一种高效简单的鱼眼镜头畸变校正算法,根据镜头设计中得到的畸变曲线,应用畸变模型运用实际像点计算出理想像点位置,将鱼眼镜头拍摄的畸变图像校正为适合于人眼观看的无畸变图像。通过车载全景显示应用中实际拍摄图像及校正图像的对比,验证出该算法精准可行。
A design method of aspheric fisheye lens is proposed. Based on the requirements of the lens of panoramic imaging system, a kind of ultra-wideiangle fisheye lens is designed, which only consists of a spherical glass lens and three aspherical plastic lenses. The maximum diameter of imaging aperture is 15.3 mm, the working distance behind is 2. 158 mm, the total length of system is 11.44 ram, the focal length is 0.97 ram, the viewing angle is 210° , and the modulation transfer function （MTF） curve reaches 0. 35 at 60 lp/mm. Furthermore, a kind of distortion correction algorithm for fisheye lens is built, which calculates the position of ideal image point using actual image poin according to the obtained distortion curve and distortion model. The algorithm can correct the distorted image taken by fisheye lens to image without distortion suitable for the human eye view, which is simple and effective. The algorithm is applied in car panoramic display system. It is verified to be accurate and reasonable, through the comparison between the real image taken by fisheye lens and the corrected image.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第12期222-227,共6页
Acta Optica Sinica
基金
天津市科技支撑计划(13ZCZDGX03000)
天津科技大学科学研究基金(20120102)
关键词
成像系统
鱼眼镜头
像差校正
图像处理
算法
imaging system
fisheye lens
distortion correction
image processing
algorithms
