Depth of focus extension of space-borne optical camera through variable curvature mirror
文献类型:会议论文
作者 | Hui, Zhao; Xiaopeng, Xie; Mingyang, Yang; Gangyi, Zou; Yating, Zhang; Xuewu, Fan |
出版日期 | 2023 |
会议日期 | 2023-10-14 |
会议地点 | Beijing, China |
关键词 | space-borne optical camera variable curvature mirror depth of focus coded imaging digital restoration |
卷号 | 12765 |
DOI | 10.1117/12.2687237 |
英文摘要 | Currently, most space-borne optical cameras have fixed focal length and depth of focus. In this case, the range within which the target can be clearly imaged has been pre-determined before launch. However, the distance of the target to the optical camera might be unknown or change very fast and therefore focus adjustment has to be carried out to obtain clear images. However, no matter which refocusing technique is used, focus adjustment might lag behind the object distance variation and depth of focus extension is a better way. Wave-front coding can be used to extend the depth of focus of incoherent imaging system but the surface profile of the phase mask could not be changed dynamically, which is not flexible for application. In this manuscript, by combing the variable curvature mirror (VCM) and coded imaging technique together, a new depth of focus extension technique is proposed. According to our previous studies, the focal plane could be quickly adjusted by changing the curvature radius of VCM. Compared with the curvature variation speed, the exposure time of the camera is quite long. Therefore, by adjusting the focal plane very fast in a wide range during the exposure through VCM, an equivalent coded optical transfer function having no null frequency points within bandwidth is generated and the image captured is uniformly blurred. After that, with the help of digital restoration, the clear image could be obtained. Because the focal plane could be adjusted through variable curvature mirror in the range of millimeter, the proposed method could be used to obtain clear images with greatly extended depth of focus. © 2023 SPIE. |
产权排序 | 1 |
会议录 | Optical Design and Testing XIII |
会议录出版者 | SPIE |
语种 | 英语 |
ISSN号 | 0277786X;1996756X |
ISBN号 | 9781510667792 |
WOS记录号 | WOS:001147890000041 |
源URL | [http://ir.opt.ac.cn/handle/181661/97138] |
专题 | 西安光学精密机械研究所_空间光学应用研究室 |
通讯作者 | Hui, Zhao |
作者单位 | Space Optics Lab, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an; 710019, China |
推荐引用方式 GB/T 7714 | Hui, Zhao,Xiaopeng, Xie,Mingyang, Yang,et al. Depth of focus extension of space-borne optical camera through variable curvature mirror[C]. 见:. Beijing, China. 2023-10-14. |
入库方式: OAI收割
来源:西安光学精密机械研究所
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