中国科学院机构知识库网格系统: 检索

Experimental research on wave-front coded imaging technique applied to large aperture space-borne optical camera 会议论文 OAI收割
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：24/0 | 提交时间：2022/04/06

computational imaging wave-front coding space-borne optical camera

Research on passive ranging technology based on wave front coding 会议论文 OAI收割
Beijing, China, 2021-06-20
作者: Mi, Jiao; Zhao, Hui

|

收藏 | 浏览/下载：17/0 | 提交时间：2022/01/30

Optical passive range Orthogonal coding Optical transfer function Mask function

Inverse sinusoidal phase mask to extend the depth of field of incoherent imaging systems 期刊论文 OAI收割
optik, 2016, 卷号: 127, 期号: 20, 页码: 9105-9110
作者: Zhou, Liang; Liu, Zhaohui; She, Wenji; Shan, Qiusha; Zhou, Liang(周亮)

收藏 | 浏览/下载：44/0 | 提交时间：2016/10/12

Wavefront coding Extended depth of field Image artifacts Optical transfer function

Combined analysis of tunable phase mask within spatial and frequency domain 期刊论文 OAI收割
acta physica sinica, 2015, 卷号: 64, 期号: 22
作者: Zhou Liang; Liu Zhao-Hui; She Wen-Ji; Zhou Liang(周亮); Zhou, L

收藏 | 浏览/下载：28/0 | 提交时间：2016/02/19

tunable wavefront coding point spread function optical transfer function

Can wavefront coding infrared imaging system achieve decoded images approximating to in-focus infrared images? 会议论文 OAI收割
Photoelectronic Technology Committee Conferences, Hefei, China, June 14, 2015
作者: Feng B(冯斌); Zhang CS(张程硕); Xu BS(徐保树); Shi ZL(史泽林)

收藏 | 浏览/下载：40/0 | 提交时间：2015/12/16

Wavefront coding optical coding digital decoding infrared imaging athermalization

Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang J.

收藏 | 浏览/下载：25/0 | 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.

The effect on tolerance distributing of an off-axis three mirror anastigmatic optical system with wavefront coding technology (EI CONFERENCE) 会议论文 OAI收割
Optical System Alignment and Tolerancing II, August 10, 2008 - August 11, 2008, San Diego, CA, United states
作者: Yan F.; Zhang X.-J.; Yan F.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

The wavefront coding technology is known as a system-level technology which can extend the depth of focus of optical system by innovative optical design and image restoration. This technology can control misfocus related aberrations including misfocus astigmatism and Petzval curvature temperature-related misfocus in digital imaging systems. It can also help optical system tolerate more residual error in optical manufacturing and alignment besides misfocus. The brief introduction of wavefront coding technology and the wavefront coded TMA system under research is presented respectively in part 1 and part 2. The "MTF similarity" is defined to describe the relationship among MTF at different position or different fields in the third part. It is also shown in this part that the MTF similarity of wavefront coded system is much higher than the normal system within a large range. In part 4 comparison between the origin system and the new system with wavefront coding technology is provided after multiple errors are introduced from which it can be observed that the system with wavefront coding technology can tolerate much bigger error than origin system. The error tolerance is re-distributed according to a new criterion based on MTF similarity. If the MTF similarity is less than a certain value it can be regarded that the system can tolerate the residual error. The new error tolerance is displayed and it is shown that the wavefront coding technology can also loosen the error distributing besides extended the depth of focus.

The research for EO imaging system simulation (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging, ISPDI 2007: Optoelectronic System Design, Manufacturing, and Testings, September 9, 2007 - September 12, 2007, Beijing, China
作者: Wang L.-J.; Zhang X.; Zhang X.; Zhang X.; Zhang J.-P.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

Electric-Optical (EO) imaging systems are modern systems especially the one consists of aspheric optics and image processing called wavefront coding system. The design concept of this kind system is totally different from the traditional image system. The trade-off between the complexity of the image deconvolution and the depth of focus extended should be considered. So we establish a simulation model consisting of optical optimization design system signal-to-noise ratio analysis and recovered image evaluation. The data can be exchanged among them. This simulation tools will be very useful in system design process.

基于RS编码及网格编码调制的光PPM通信纠错技术 期刊论文 OAI收割
光子学报, 2008, 卷号: 37, 期号: 7, 页码: 1361, 1364
梁波; 陈卫标

收藏 | 浏览/下载：1038/159 | 提交时间：2009/09/18

空间光通信 Communication performances RS纠错码 Effective communications TCM技术 External code PPM调制 Numerical simulations Optical channels Optical communication systems Optical- PPM modulation Reed-Solomon code RS coding Space optical communication TCM Trellis code modulations Trellis-code modulation

Imaging quality analysis of KBA x-ray microscope working at grazing incidence (EI CONFERENCE) 会议论文 OAI收割
Optical Design and Testing II, November 8, 2004 - November 11, 2004, Beijing, United states
作者: Zhao L.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

In the latest 20 years x-ray imaging technology has developed fast in order to meet the need of x-ray photo-etching spatial exploration technology high-energy physics procedure diagnosis of inertial confinement fusion (ICF) et al. Since refractive index of materials in the x-ray region is lower than 1 and x-ray is strongly absorbed by materials it is very difficult to image objects in the x-ray region. Conventional imaging methods are hardly suitable to x-ray range. In general grazing reflective imaging and coding aperture imaging methods have been adopted more and more. In this paper according to user's requirement we have designed a non-coaxial grazing KBA microscope. The microscope consists of two sets of perpendicular spherical mirrors each set includes two parallel mirrors. Taking it as an example we have compiled an optical computing program for the non-coaxial grazing imaging systems so as to analyze and evaluate aberrations of KBA microscope. Thus it can help us to get an optimal comprehension of KBA x-ray imaging system. In the same time the analytical results provide reliable foundation for evaluating imaging quality of KBA microscope.