中国科学院机构知识库网格系统: 检索

Topological relationship model for geographical flows 期刊论文 OAI收割
CARTOGRAPHY AND GEOGRAPHIC INFORMATION SCIENCE, 2022, 页码: 17
作者: Jiang, Jingyu; Wang, Xi; Liu, Tianyu; Fang, Zidong; Pei, Tao

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收藏 | 浏览/下载：33/0 | 提交时间：2022/10/08

Geographical flow topological relationship 9-intersection model relative direction carpool

Topological relationship model for geographical flows 期刊论文 OAI收割
CARTOGRAPHY AND GEOGRAPHIC INFORMATION SCIENCE, 2022, 页码: 17
作者: Jiang, Jingyu; Wang, Xi; Liu, Tianyu; Fang, Zidong; Pei, Tao

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收藏 | 浏览/下载：43/0 | 提交时间：2022/10/08

Geographical flow topological relationship 9-intersection model relative direction carpool

北京东灵山土壤动物多样性海拔格局研究 学位论文 OAI收割
博士, 北京: 中国科学院研究生院, 2016
作者: 徐国瑞

收藏 | 浏览/下载：43/0 | 提交时间：2017/08/03

海拔样带，土壤动物，群落结构，生物多样性，相对多度分布，粒径谱 elevational gradient transect, soil invertebrates, community structure, biodiversity, relative abundance distribution, density-body mass relationship

Morphometric Characterization and Reconstruction Effect Among Lunar Impact Craters SCI/SSCI论文 OAI收割
2014
作者: Wang J.; Wang J.

收藏 | 浏览/下载：20/0 | 提交时间：2014/12/24

Morphometric characterization Position relationship Relative construction age Chang'E-1 change-1 moon

Dynamic coupling analysis and modeling for stabilized platform of rolling-pitching seeker (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
作者: Liu H.; Liu H.; Liu H.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

Missile's attitude change will be delivered to visual axis through stabilized platform during maneuvering flight and the missile vibration will be an interference source to visual axis stabilization. In order to solve this problem the coupling relationship between missile attitude and visual axis is obtained by Coordinate transformation. When the seeker stably tracks a target the angular velocity of visual axis in inertial space is zero so the relative angular velocity of roll axis and pitch axis can be derived for servo control. According to Oura dynamics equation the dynamic models of roll axis and pitch axis were established and kinetic equations of two axises were obtained. The dynamic models can provide theoretical basis to developing research of servo control system and structural optimization design of stabilized platform. Finally some measures could reduce the dynamic coupling between the framework was given. 2011 IEEE.

The study of mapping relation of aeroplane complex motion and image movement and compensation technique (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer Application and System Modeling, ICCASM 2010, October 22, 2010 - October 24, 2010, Shanxi, Taiyuan, China
Wei Z.; Wang Y.-Y.; Xue W.-Q.; Dai M.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

In order to solve the problem of image blurring due to the image motion which results from the aircraft's motion attitude changes and the relative motion of the camera and aircraft firstly we install linear displacement transducer on the four shock absorbers. By analyzing the displacement values the geometrical relationship between the camera and the aircraft is acquired then relative motion amount between the object and the aircraft is obtained according to the motion and attitude changes. After that making use of geometrical relationship we can calculate the displacement variation of pixels within the camera exposure time. Thereafter taking consider variable motion and non-linear motion as uniform motion in a straight line at the moment of imaging then the model of the blurring image can be established according to the displacement variation of pixels within the camera exposure time and fuzzy point spread function in the two-dimensional movement is built. By using Wiener filtering method with the optimal window the image blurring is eliminated in aerial imaging system. Practice proved that this method can effectively eliminate the image blurring in the aerial imaging system. 2010 IEEE.

Study of high precision non-contact measurement based on CCD (EI CONFERENCE) 会议论文 OAI收割
4th International Conference on Information Technology and Applications, ICITA 2007, January 15, 2007 - January 18, 2007, Harbin, China
Lin L.; Yun F.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

In this paper a method that measures relatively positionrelationshipquickly and accurately between two vehicles both on a horizontal plane is introduced. When the linear CCD camera placed on the end of manipulator scans two point targets located on the other vehicle by virtue of the spatial intersection principle and trigonometry theorem the relative position relationship between the loading vehicles and launching ones can be gotten(i.e. the spatial coordinate parameters of x y z and the angle displacement ). At the same time the paper establishes that the measurement error of length is less than 1mm by analysis of thee rror analysis and the simulation of computer. The angle displacement is less than 3 which satisfies the technical requests. So the vehicle orientation and loading missiles can be both done at the shortest time. It meets the demand of centralization between the measurement and execution. Forboth automatic transshipment and spatial position relationship measurement the study is valuable. And the manipulator is measure device as well as executive one so that residual inherent error decreases according to identical reference principle. Therefore the measure precision can be improved greatly.

Research on the affect of differential-images technique to the resolution of infrared spatial camera (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, July 8, 2007 - July 12, 2007, Chengdu, China
Jin G.; An Y.; Qi Y.; Hu F.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

The optical system of infrared spatial camera adopts bigger relative aperture and bigger pixel size on focal plane element. These make the system have bulky volume and low resolution. The potential of the optical systems can not be exerted adequately. So one method for improving resolution of infrared spatial camera based on multi-frame difference-images is introduced in the dissertation. The method uses more than one detectors to acquire several difference images and then reconstructs a new high-resolution image from these images through the relationship of pixel grey value. The technique of difference-images that uses more than two detectors is researched and it can improve the resolution 2.5 times in theory. The relationship of pixel grey value between low-resolution difference-images and high-resolution image is found by analyzing the energy of CCD sampling a general relationship between the enhanced times of the resolution of the detected figure with differential method and the least count of CCD that will be used to detect figure is given. Based on the research of theory the implementation process of utilizing difference-images technique to improve the resolution of the figure was simulated used Matlab software by taking a personality image as the object and the software can output the result as an image. The result gotten from the works we have finished proves that the technique is available in high-resolution image reconstruction. The resolution of infrared spatial camera can be improved evidently when holding the size of optical structure or using big size detector by applying for difference image technique. So the technique has a high value in optical remote fields.

The geometric distortions correction of uncooled large-sized relative aperture infrared imaging system (EI CONFERENCE) 会议论文 OAI收割
Infrared Components and their Applications, November 8, 2004 - November 11, 2004, Beijing, China
作者: Sun Q.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

The geometric distortion of infrared image which was created by the large-sized relative aperture optical system. It could be corrected by the digital image processing technology. The magnitude of distortion would be enlarged quickly with the enlargement of relative aperture. Though the distortion could not impact on the articulation of the image it would affect geometric location precision of the image directly. In this paper the distortion correction of uncooled large-sized relative aperture infrared imaging system was discussed and the mathematical model of distortion correction was established. A algorithm of digital image processing was presented and applied based on control points by combining polynomial warping and space variant linear image interpolation. The method of polynomial warping was used to establish the locality relationship between the original image and the distortion ones. The space-variant linear image interpolation provided an efficient way to rebuild the frame of images. The computational costs of the proposed approach are very little and the precision is almost as high as the method of bicubic interpolation when compared to those of state-of-the-art nonlinear interpolation operators.

基于关联概率模型的指纹识别算法 学位论文 OAI收割
工学硕士, 中国科学院自动化研究所: 中国科学院研究生院, 2003
何余良

收藏 | 浏览/下载：85/0 | 提交时间：2015/09/02

生物识别技术关联概率模型关联关系可变界限盒综合细节点 biometrical identification technology correlative probability model relative relationship invariable-bounding comprehensive minu