Catadioptric omnidirectional system with undistorted imaging
-
摘要: 单视点折反射全景成像系统畸变较大，通过计算反射镜面型可有效地实现折反射全景成像系统消畸变成像。在反射镜入射角与反射角呈线性关系的基础上，推导适用于消畸变折反射全景成像的反射镜面型公式。为说明反射镜面型的准确性，设计了F#为3.3，视场为138的消畸变成像折反射全景成像系统，并利用实际像平面和虚拟像平面间的坐标映射关系，实现了系统的消畸变设计。各视场MTF在奈奎斯特频率下均达到0.6， 边缘视场相对畸变小于4 %。结果表明：该面型可实现消畸变折反射全景成像，反射角光线追迹法适用于折反射全景成像系统畸变评价，为折反射全景成像系统消畸变设计提供了必要的模型和计算方法。Abstract: A catadioptric system uses a combination of lenses and mirrors placed in a carefully arranged configuration to capture a much wider field of view. However, images obtained by using a single-viewpoint catadioptric omnidirectional system have a large amount of visual distortion. To design a catadioptric omnidirectional system with undistorted imaging, appropriate surfaces were presented. The surfaces preserved a linear relationship between the angle of incidence of light onto the surface and the angle of reflection onto the imaging device, as does a normal mirror. The reflective mirror and the lens were designed for a catadioptric omnidirectional camera with the F number 3.3 and the field of view 138. The modulation transfer function is better than 0.6 at 66.7 lp/mm and the distortion is less than 4% over the whole active area of the image sensor. The deduction of the reflective surfaces offers an essential model and a computing method to design a catadioptric omnidirectional system with undistorted imaging.
-
-
［1］王道义, 黄大为, 邬敏贤，等. 全景环形透镜原理与特点剖析［J］. 光学技术, 1998, 1(1):10-12.
WANG Dao-yi, HUANG Da-wei, WU Min-xian,et al. Principles and characteristics of panoramic annular lens［J］. Optical Technology, 1998,1(1):10-12.（in Chinese with an English abstract）
［2］吴振宇, 高明. 基于孔径分布概念的全景系统光学设计［J］. 应用光学, 2010, 31(2):174-179.
WU Zhen-yu, GAO Ming. Optical design of panoramic system based on distributed aperture concept［J］. Journal of Applied Optics, 2010, 31(2):174-179.（in Chinese with an English abstract）
［3］曾吉勇, 苏显渝. 双曲面折反射全景成像系统［J］. 光学学报, 2003, 23(9):1138-1142.
ZENG Ji-yong, SU Xian-yu. Hyperboloidal catadioptric omnidirectional imaging system［J］. Acta Optica Sinica, 2003, 23(9): 1138-1142.（in Chinese with an English abstract）
［4］NAYAR S K. Catadioptric omnidirectional camera［C］//1997 IEEE Computer Society Conference on Digital Object Identifier.［s.n］:CVPR,1997: 482-488
［5］BAKER S, NAYAR S K. A theory of single-viewpoint catadioptric image formation［J］. International Journal of Computer Vision, 1999, 35(2):175-196.
［6］CHAHL J S, SRINIVASAN M V. Refective surfaces for panoramic imaging［J］. Applied Optics, 1997, 36(31):8275-8285.
［7］KWEON G, SEUNG H, KIM G, et al. Wide-angle catadioptric lens with a rectilinear projection scheme［J］. Applied Optics, 2006, 45(34):8659-8673.
［8］NALWA V S. A true omni-directional viewer［R］. USA:Bell Laboratories Technical Memorandum, BL0115500960115-01,1996.
计量
- 文章访问数: 4562
- HTML全文浏览量: 128
- PDF下载量: 1011
下载:
陕公网安备 61011302001501号 