中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共12条，第1-10条

帮助

条数/页：排序方式：
	Multi-Aperture Joint-Encoding Fourier Ptychography for a Distributed System 期刊论文 OAI收割 Remote Sensing, 2024, 卷号: 16, 期号: 6 作者: Wang, Tianyu; Xiang, Meng; Liu, Fei; Liu, Jinpeng; Dong, Xue \| 收藏 \| 浏览/下载：7/0 \| 提交时间：2024/07/22 Fourier ptychography joint encoding optical camera key technique of remote sensing payload
	Image registration based on Mexican-hat wavelets and pseudo-Zernike moments (EI CONFERENCE) 会议论文 OAI收割 2012 World Automation Congress, WAC 2012, June 24, 2012 - June 28, 2012, Puerto Vallarta, Mexico 作者: 收藏 \| 浏览/下载：36/0 \| 提交时间：2013/03/25 Image registration is a key technique in pattern recognition and image processing and it is widely used in many application areas such as computer vision remote sensing image fusion and object tracking. A method for image registration combining Mexican-hat wavelets and pseudo-Zernike moments is proposed. Firstly feature points are extracted using scale-interaction Mexican-hat wavelets in the reference image and sensed image respectively. Then pseudo-Zernike moments are used to match them and classical RANSAC used to eliminate the wrong matches. And then the well match points are used to estimate the best affine transform parameters by least squares minimization. At last the sensed image is transformed and resampled to accomplish the image registration. The experiments indicate that the proposed algorithm extracts feature points and matches them exactly and eliminates wrong matched points effectively and achieves nice registration results. 2012 TSI Press.
	cmqv+: an authenticated key exchange protocol from cmqv 期刊论文 OAI收割 SCIENCE CHINA-INFORMATION SCIENCES, 2012, 卷号: 55, 期号: 7, 页码: 1666-1674 Li Hui; Wu ChuanKun \| 收藏 \| 浏览/下载：25/0 \| 提交时间：2013/09/17 key exchange eCK model trapdoor-test technique provable security CDH assumption
	Fabrication of submicron photon sieve using E-beam lithography and X-ray lithography 期刊论文 OAI收割 MICROELECTRONIC ENGINEERING, 2011, 卷号: 88, 期号: 10, 页码: 3178-3181 作者: Jiang, Wenbo; Hu, Song; Xie, Changqing 收藏 \| 浏览/下载：28/0 \| 提交时间：2015/09/21 Submicron photon sieve E-beam lithography X-ray lithography Key technique Error analysis
	Key technologies on YAG laser engraving ceramic anilox roll 会议论文 OAI收割 2nd Annual Conference on Electrical and Control Engineering, ICECE 2011, Yichang, China, SEP 16-18, 2011 作者: Wang HC(王红才); Wang Y(王扬); Yang MJ(杨明江) 收藏 \| 浏览/下载：28/0 \| 提交时间：2013/04/11 Etching Light transmission Technology Ceramic anilox rolls Flexography High repetition Key technologies Laser cavity Laser engraving laser technique Laser texturing Light pulse tow-dimension controllable distribution YAG laser
	Autofocusing technique based on image processing for remote-sensing camera (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2007 - Image Processing, September 9, 2007 - September 12, 2007, Beijing, China 作者: Wang X.; Xu S.-Y.; Wang X.; Wang X. 收藏 \| 浏览/下载：20/0 \| 提交时间：2013/03/25 The key to the auto-focusing technique based on image processing is the selection of focus measure reflecting image definition. Usually the measures derived are on the premise of the images acquired with the same scene. As for the remote-sensing camera working in linear CCD push-broom imaging mode the premise doesn't exist because the scenes shot are different at any moment which brings about difficulties to the selection of the focus measure. To evaluate the image definition the focus measure based on blur estimation for rough adjustment is proposed to estimate the focused position by only two different lens positions which greatly saves the auto-focusing time. Another evaluation function based on edge sharpness is developed to find best imaging position in the narrow range. Simulations show that the combination of the two measures has the advantages of rapid reaction and high accuracy.
	不可能差分密码分析研究进展期刊论文 OAI收割系统科学与数学, 2008, 卷号: 28, 期号: 8, 页码: 971-983 吴文玲; 张蕾 \| 收藏 \| 浏览/下载：45/0 \| 提交时间：2010/08/20 不可能差分分析不可能差分路径中间相错技术密钥筛选 Impossible differential cryptanalysis impossible differential characteristics miss-in-the-middle technique key sieving
	Support technique of ultra thin mirror in space optics (EI CONFERENCE) 会议论文 OAI收割 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 2, 2005 - November 5, 2005, Xian, China 作者: Ren J.-Y.; Gao M.-H. 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/03/25 With the development of space optical system the technique of ultra thin mirror come forth and is paid more attention because of less difficulty in machining low cost lightweight no disassembly during detecting and maintaining. The key technique takes advantage of deformation of ultra thin mirror as the influence of environment to adjust the surface figure. Its accuracy meets requirement. An analysis method is based on finite element analysis (FEA) and many items including the amount of support points the way of arrangement the optimum design of support component are studied. The finite element method was used to analyze the mirror and some different mirror support schemes. The principal aim of the mirror analysis is to get numbers of support points and the ways of the support. There are three schemes including 12-6-1 12-8-1 and 16-8-1 models. Deformation of deadweight is calculated under the three conditions. The way of 16-8-1 is more suitable than the designs of other two. The support subassembly is amended to meet with the mirror surface RMS in the range of 30m. Deformation of the mirror with support structure has been calculated. The result is 16.52nm lower than a quarter of the wavelength which indicates the feasibility of the support scheme applied to mirror. Theoretical result for the best way of support is presented. The result of analysis shows that requirement surface figure could be met through adjusting support points. It predicts feasibility of the support technique and provides theoretical value for active adjustment in the laboratory. At present support and adjusting experiment of ultra thin mirror is being carried on.
	Using one-dimensional nonlinear photonic crystal for dynamical addressing optical interconnection (EI CONFERENCE) 会议论文 OAI收割 ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China 作者: Li C.; Wang W.; Wang W.; Li C.; Li C. 收藏 \| 浏览/下载：33/0 \| 提交时间：2013/03/25 Optical interconnection is the key technique of high-speed optical information process and optical communication. A lot of approaches for optical interconnection have been proposed since Goodman in Stanford University firstly proposed the optical interconnection for very large scale integrated circuits technology. A dynamical addressing device for optical interconnection was designed and fabricated in this paper. This optical device is based on one-dimensional nonlinear photonic crystal made on the planar waveguide. The nonlinear materials ZnS and ZnSe which have large nonlinear refractive index coefficients were alternately deposited on the waveguide to form one-dimensional photonic crystal. The Bragg condition is changed when the input power of the control light increased due to the nonlinear characters of the materials thus the reflective angle of the signal light can be changed with the input power change of the control light. In our experiment when increasing the power density of control light from 0 to 2.60X105W/cm 2 the angle of the signal beam can be changed about 20. The interconnection characteristics were investigated in theory and in experiment. The testing data agree well with theoretical predictions. This kind of devices is promising to use in the all-optical interconnection optical information processing and optical communication.