Improved vector extrapolation based Richardson-Lucy algorithm used for wavefront coded imaging and experimental demonstration | |
Zhao, Hui1; Xia, Jingjing1,2; Zhang, Ling1,2; Yu, Congcong1,2; Fan, Xuewu1 | |
2019 | |
会议日期 | 2019-06-24 |
会议地点 | Munich, Germany |
关键词 | wave-front coding computational imaging Richardson-Lucy algorithm vector extrapolation |
卷号 | 11062 |
DOI | 10.1117/12.2525721 |
英文摘要 | Wave-front coding is a mile-stone technique that can be used to greatly extend the DOF (depth of field) of incoherent imaging system. Besides the phase mask design, the digital restoration is very crucial to obtain clear image with largely extended DOF. Richardson-Lucy (RL) algorithm is a kind of nonlinear image restoration method which is based on Poisson noise model and maximum likelihood estimation. Because RL algorithm can generate high quality restoration result and own the capability to realize super-resolution construction, it has been widely applied in the field of astronomy, macroscopic imaging and et.al. However, classical RL algorithm converges very slowly and have to be run many times to achieve an acceptable restoration result when it is applied to wave-front coded imaging system whose point spread function has quite a large support region. Our previously published results demonstrate that at least 60 times iterations are needed for each color channel, which severely prohibits real-time implementation of classical RL algorithm. Therefore in this manuscript, an improved vector extrapolation based RL algorithm is designed by embedding the modified exponent into the framework of traditional vector extrapolation based RL algorithm. Not only a bigger iteration step indicating a bigger acceleration ratio is obtained, but also the noise amplification is effectively prohibited. Experimental results demonstrate that with the same number of iterations, the restored image corresponding to the improved vector extrapolation based RL algorithm has a better visual quality. At the same time, the structural similarity index (SSIM) is used as a criterion to determine the optimum iterations for each color channel and optimum combinations of algorithm parameters, based on which total iterations for color images are reduced approxiamately 78.9% and visually satisfactory restoration results can be obtained without denoising the restored image further. It could be considered that the work reported in this manuscript paves the way for realization of the embedded processing based real-time wave-front coded imaging in the future. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. |
产权排序 | 1 |
会议录 | Digital Optical Technologies 2019 |
会议录出版者 | SPIE |
语种 | 英语 |
ISSN号 | 0277786X;1996756X |
ISBN号 | 9781510628038 |
WOS记录号 | WOS:000502141600025 |
内容类型 | 会议论文 |
源URL | [http://ir.opt.ac.cn/handle/181661/31922] |
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 | Zhao, Hui |
作者单位 | 1.Xi'An Institute of Optics and Precision Mechanics, CAS, Xi'an; 710119, China; 2.Graduate School of University of Chinese Academy of Science, Beijing; 100047, China |
推荐引用方式 GB/T 7714 | Zhao, Hui,Xia, Jingjing,Zhang, Ling,et al. Improved vector extrapolation based Richardson-Lucy algorithm used for wavefront coded imaging and experimental demonstration[C]. 见:. Munich, Germany. 2019-06-24. |
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