中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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浏览/检索结果: 共8条,第1-8条 帮助

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A New Forest Leaf Area Index Retrieval Algorithm Over Slope Surface 期刊论文  OAI收割
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2024, 卷号: 62, 页码: 18
作者:  
He, Min;  Wen, Jianguang;  Wu, Shengbiao;  Meng, Lei;  Lin, Xingwen
  |  收藏  |  浏览/下载:20/0  |  提交时间:2024/03/01
Coupled chemo-mechanical behavior of CO2 mineral trapping in the reservoir sandstones during CO2-EWR 期刊论文  OAI收割
ENVIRONMENTAL EARTH SCIENCES, 2019, 卷号: 78, 期号: 15, 页码: -
作者:  
Zheng, Hong;  Feng, Xia-Ting;  Li, Shaojun;  Qiu, Shili;  Wang, Bin
  |  收藏  |  浏览/下载:29/0  |  提交时间:2020/04/08
STEP-based Feature Recognition System for B-spline Surface Features 期刊论文  OAI收割
International Journal of Automation and Computing, 2018, 卷号: 15, 期号: 4, 页码: 500-512
作者:  
Bitla Venu;  Venkateswara Rao Komma;  Deepanshu Srivastava
  |  收藏  |  浏览/下载:12/0  |  提交时间:2021/02/23
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:23/0  |  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.  
Estimating leaf area index by inversion of reflectance model for semiarid natural grasslands 期刊论文  iSwitch采集
Science in china series d-earth sciences, 2009, 卷号: 52, 期号: 1, 页码: 66-84
作者:  
Zhang Na;  Zhao YingShi
收藏  |  浏览/下载:31/0  |  提交时间:2019/05/10
Geometrical modulation transfer function of different active pixel of CMOS APS (EI CONFERENCE) 会议论文  OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 2, 2005 - November 5, 2005, Zian, China
作者:  
Li J.;  Liu J.;  Liu J.;  Liu J.;  Li J.
收藏  |  浏览/下载:25/0  |  提交时间:2013/03/25
The geometrical Modulation Transfer Function (MTF) of CMOS APS (active pixel sensor) is analyzed in this paper. Advanced APS have been designed and fabricated where different pixel shapes such as square  rectangle and L shape  were placed  because the amplifier circuit and other function circuits inter pixel of APS take up some pixel area. MTF is an important figure of merit in focal plane array imaging sensors. Research on analyzing the MTF for the proper pixel shape is currently in progress for a centroidal configuration of a target position. MTF will give us a more complete understanding of the tradeoffs opposed by the different pixel designs and by the signal processing conditions. Based on image sensor sampling and reconstructing model  the MTF expression of any active pixel shape has been deduced in this paper. According to actual pixel shape  three different active area pixels were analyzed  they were square  rectangle  and L shape  their Fill Factor (FF) is 30%  44% and 55%  respectively. Results of simulation experiments indicate that different pixel geometrical characteristics contribute significantly to the figures of their MTF. Different geometrical shape of active sensitive area of pixel and different station in pixel would influence MTF figures. The analysis results are important in designing better APS pixel and more important in analyzing imaging system performance of APS subpixel precision system.  
An alternative method to compute the component fractions in the geometrical optical model: Visual computing method SCI/SSCI论文  OAI收割
2003
Su H. B.; Zhang R. H.; Tang X. Z.; Sun X. M.; Zhu Z. L.; Li Z. L.
收藏  |  浏览/下载:27/0  |  提交时间:2012/06/08
Analysis of the new data of transverse energy-distributions in high-energy p-a collisions based on geometrical model 期刊论文  iSwitch采集
High energy physics & nuclear physics-english edition, 1994, 卷号: 18, 期号: 4, 页码: 385-390
作者:  
LIN, B;  ZHAO, WQ
收藏  |  浏览/下载:24/0  |  提交时间:2019/04/23