中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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The design and fabrication of freeform lenses for generating complex illumination patterns on curved surfaces 会议论文  OAI收割
Xian, PEOPLES R CHINA, 2020-10-15
作者:  
Zhang, Yupeng;  Mao, Xianglong;  Xie, Yongjun;  Li, Jinpeng;  Wang, Fengbiao
  |  收藏  |  浏览/下载:32/0  |  提交时间:2021/07/23
高速超分辨结构光照明显微的关键技术及应用 期刊论文  OAI收割
激光与光电子学进展, 2020, 卷号: 57, 期号: 24
作者:  
赵天宇;  汪召军;  冯坤;  梁言生;  何旻儒
  |  收藏  |  浏览/下载:57/0  |  提交时间:2021/03/23
Study on uniform irradiance of micro curved-light-emitting diode array 期刊论文  OAI收割
Acta Physica Sinica, 2018, 卷号: 67, 期号: 7, 页码: 12
作者:  
Ban, Z.;  Liang, J. Q.;  Lu, J. G.;  Liang, Z. Z.;  Feng, S. Y.
  |  收藏  |  浏览/下载:22/0  |  提交时间:2019/09/17
Off Axis Illumination Planar Hyperlens for Non-contacted Deep Subwavelength Demagnifying Lithography 期刊论文  OAI收割
PLASMONICS, 2014, 卷号: 9, 期号: 6, 页码: 1333-1339
作者:  
Zhang, Wei;  Yao, Na;  Wang, Changtao;  Zhao, Zeyu;  Wang, Yanqin
收藏  |  浏览/下载:34/0  |  提交时间:2015/07/10
The research on statistical properties of TDI-CCD imaging noise (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Gu Y.-Y.; Shen X.-H.; He G.-X.
收藏  |  浏览/下载:23/0  |  提交时间:2013/03/25
TDI-CCD can improve the sensitivity of space camera without any degradation of spatial resolution which is widely used in aerospace imaging devices. The article describes the basic working principle and application characteristics of TDI-CCD devices  analyses the composition of TDI-CCD imaging noise  and propose a new method to analyze TDI-CCD imaging noise with statistical probability distribution. In order to estimate the distribution of gray values affect by noise we introduced the concept of skewness and kurtosis. We design an experiment using constant illumination light source  take image with TDI-CCD working at different stage such as stage 16  stage 32  stage 48  stage 64 and stage 96  analyse the characteristics of image noise with the method we proposed  experimental results show that the gray values approximately meet normal distribution in large sample cases. 2011 SPIE.  
A design on a control method of a new type of focal plane shutter (EI CONFERENCE) 会议论文  OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Xue L.; Ming L.; Zheng L.-N.; Zhou J.-F.; Zhang H.-W.; Zhang J.-C.
收藏  |  浏览/下载:33/0  |  提交时间:2013/03/25
In order to ensure appropriate exposure time  and no exposure while electric charge is transferring after taking a photograph  it is necessary to have the shutter mechanism cooperate with CCD for area CCD aerial cameras. The ground object illumination has a wide range which is from 4000Lx to 100000Lx  so a shutter which is high efficient and a continuous stepless adjustment are also required. This paper introduces the fundamental principle  structural design and control procedure about this new focal plane shutter. Under the control of DSP  the velocity of shutter curtain governed by the shutter motor can be not only precisely controlled  but also the durability and the reliability are increased. The experiment results have shown that this new shutter has the higher stability of movement  long life span with more than 105 operating times  a wide range of exposure time from1/ 50s to 1/ 320s(depending on the slit width)and the exposure error is less than 10%. With the CCD gain adjustment  the performance of this shutter is fully satisfied with the requirements of area CCD aerial cameras. 2010 IEEE.  
Two-dimensional performance of uniform irradiation with the use of an edge-softened lens array and spectral dispersion 期刊论文  OAI收割
appl. optics, 2007, 卷号: 46, 期号: 16, 页码: 3164, 3168
Jiang Xiujuan; Zhou Shenlei; 林尊琪; Zhu Jian
收藏  |  浏览/下载:1349/463  |  提交时间:2009/09/18
Target track system design based on circular projection (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
Song H.-J.; Zhu M.; Hu S.; Shen M.-L.
收藏  |  浏览/下载:22/0  |  提交时间:2013/03/25
Template matching is the process of searching the present and the location of a reference image or an object in a scene image. Template matching is a classical problem in a scene analysis: given a reference image of an object  decide whether that object exists in a scene image under analysis  and find its location if it does. The template matching process involves cross-correlating the template with the scene image and computing a measure of similarity between them to determine the displacement. The conventional matching method used the spatial cross-correlation process which is computationally expensive. Some algorithms are proposed for this speed problem  such as pyramid algorithm  but it still can't reach the real-time for bigger model image. Moreover  the cross-correlation algorithm can't be effective when the object in the image is rotated. Therefore  the conventional algorithms can't be used for practical purpose. In this paper  an algorithm for a rotation invariant template matching method based on different value circular projection target tracking algorithm is proposed. This algorithm projects the model image as circular and gets the radius and the sum of the same radius pixel value. The sum of the same radius pixel value is invariable for the same image and the any rotated angle image. Therefore  this algorithm has the rotation invariant property. In order to improve the matching speed and get the illumination invariance  the different value method is combined with circular projection algorithm. This method computes the different value between model image radius pixel sum and the scene image radius pixel sum so that it gets the matching result. The pyramid algorithm also is been applied in order to improve the matching speed. The high speed hardware system also is been design in order to meet the real time requirement of target tracking system. The results show that this system has the good rotate invariance and real-time property.