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浏览/检索结果: 共6条，第1-6条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Experimental research on wave-front coded imaging technique applied to large aperture space-borne optical camera 会议论文 Nantong, PEOPLES R CHINA, 2021-10-10 作者:  Zhao Hui;  Mi Jiao;  Li Chuang;  Zou Gangyi;  Fan Xuewu 收藏  |  浏览/下载：9/0  |  提交时间：2022/04/06 computational imaging  wave-front coding  space-borne optical camera   Improved vector extrapolation based Richardson-Lucy algorithm used for wavefront coded imaging and experimental demonstration 会议论文 Munich, Germany, 2019-06-24 作者:  Zhao, Hui;  Xia, Jingjing;  Zhang, Ling;  Yu, Congcong;  Fan, Xuewu 收藏  |  浏览/下载：36/0  |  提交时间：2019/11/27 wave-front coding  computational imaging  Richardson-Lucy algorithm  vector extrapolation   Design and Implementation of a Cooke Triplet based Wave-front Coded Super-resolution Imaging System 会议论文 conference on optical systems design - computational optics, jena, germany, 2015-09 作者:  Zhao, Hui;  Wei, Jingxuan 收藏  |  浏览/下载：16/0  |  提交时间：2016/01/15 wave-front coding  depth of focus extension  super-resolution imaging  Cooke Triplet   Comprehensive performance analysis of popular odd-symmetric phase masks used for wave-front coded imaging system 会议论文 photonics asia 2010, spie, 北京, 2010-10-18~2010-10-21 Zhao H(赵惠); Li YC(李英才) 收藏  |  浏览/下载：12/0  |  提交时间：2010/12/09 wave-front coding  depth of field  odd-symmetric phase masks  incoherent imaging system   Cubic sinusoidal phase mask: Another choice to extend the depth of field of incoherent imaging system 期刊论文 optics and laser technology, 2010, 卷号: 42, 期号: 4, 页码: 561-569 作者:  Zhao, Hui;  Li, Yingcai;  Feng, Huajun;  Xu, Zhihai;  Li, Qi 收藏  |  浏览/下载：22/0  |  提交时间：2010/12/09 Wave-front coding  Sinusoidal component  Composite phase mask   Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China Zhang X.; Zhang X.; Shi G.; Zhang J.; He F. 收藏  |  浏览/下载：18/0  |  提交时间：2013/03/25 Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus  which means the system MTF is quite insensitive to defocus  and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However  it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration  especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification  a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm  effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed  in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried  and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.