冀鹏州, 穆郁, 张晨钟, 孟军合, 赵侃, 徐大维. 用于亚公里级三维成像的全光相机主物镜设计[J]. 红外与激光工程, 2022, 51(3): 20210493. DOI: 10.3788/IRLA20210493
引用本文: 冀鹏州, 穆郁, 张晨钟, 孟军合, 赵侃, 徐大维. 用于亚公里级三维成像的全光相机主物镜设计[J]. 红外与激光工程, 2022, 51(3): 20210493. DOI: 10.3788/IRLA20210493
Ji Pengzhou, Mu Yu, Zhang Chenzhong, Meng Junhe, Zhao Kan, Xu Dawei. Optical system design of plenoptic camera main objective in sub-kilometer-scale 3D imaging[J]. Infrared and Laser Engineering, 2022, 51(3): 20210493. DOI: 10.3788/IRLA20210493
Citation: Ji Pengzhou, Mu Yu, Zhang Chenzhong, Meng Junhe, Zhao Kan, Xu Dawei. Optical system design of plenoptic camera main objective in sub-kilometer-scale 3D imaging[J]. Infrared and Laser Engineering, 2022, 51(3): 20210493. DOI: 10.3788/IRLA20210493

用于亚公里级三维成像的全光相机主物镜设计

Optical system design of plenoptic camera main objective in sub-kilometer-scale 3D imaging

  • 摘要: 全光相机可以在成像后进行重聚焦,并且一次曝光就可以同时获取目标的位置信息和方向信息。相较于主动测距方法和传统的被动测距方法,基于全光相机的深度测量方法具有不易被侦查和易于标定的优势。基于全光相机的三维成像技术是集前端光学系统与后端信息处理为一体的计算成像技术,目前的研究工作主要集中于后端信息处理算法,对前端光学系统的研究鲜有报道,因此对前端光学系统设计进行研究。首先,建立基于多目视觉全光相机深度分辨率计算模型并分析焦距、F#等光学系统性能参数对物方深度分辨率的影响;然后,分析两反光学系统的遮拦比、次镜的放大倍率等因素对系统参数的影响;最后,综合考虑设计、加工、装调以及测距性能等方面,设计了一款用于亚公里级三维成像的全光相机主物镜光学系统,系统焦距为500\;\rmmm,系统总长小于\text163\;\rmmm,摄远比小于1 / 3,工作温度范围为−40~70 ℃。不同温度下全视场MTF在80\;\rmlp/\rmmm处优于0.3,使用此物镜的全光相机配合1 / 8像素的亚像元识别精度的算法,在0.5 km处可获得 < 5\;\rmm的深度分辨率。

     

    Abstract: The plenoptic camera can refocus after imaging, and obtain the position and direction information of the target at the same time with one exposure. Compared with the active distance measurement method and the traditional passive distance measurement method, the depth measurement method based on the plenoptic camera has the advantages of being difficult to detect and easy to calibrate. The plenoptic camera 3D imaging technology is a computational imaging technology that integrates the front-end optical system and the back-end information processing. The current research works mainly focus on the back-end information processing algorithm et al. There are few reports on the research of the front-end optical system. Therefore, the design of the front-end optical system was researched. Firstly, a calculation model was established for the depth resolution of a plenoptic camera based on multi-eye vision and the influence of optical system performance parameters was analyzed such as focal length and F-number on the object depth resolution. Secondly, the influence of factors was analyzed such as the blocking ratio of the two-mirror optical system and the magnification of the secondary mirror on the system parameters. Finally, a plenoptic camera main objective optical system for sub-kilometer-scale 3D imaging was designed comprehensively considering the design, processing, assembly, and ranging performance. The focal length of the system is 500 mm, the total length of the system is less than 163 mm, the telephoto ratio is less than 1/3, and the working temperature range is −40 -70 ℃. The full field of view MTF in 80 lp/mm is better than 0.3 at different temperatures. If the plenoptic camera uses this objective and a sub-pixel recognition accuracy algorithm of 1/8 pixel, a depth resolution of less than 5 m can be obtained at 0.5 km.

     

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