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长春光学精密机械与物... [3]
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会议论文 [3]
发表日期
2010 [3]
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发表日期:2010
内容类型:会议论文
专题:长春光学精密机械与物理研究所
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Mechanism of STED microscopy and analysis of the factors affecting resolution (EI CONFERENCE)
会议论文
6th International Symposium on Precision Engineering Measurements and Instrumentation, August 8, 2010 - August 11, 2010, Hangzhou, China
Yang P.
;
Ai H.
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浏览/下载:18/0
  |  
提交时间:2013/03/25
Stimulated emission depletion (STED) microscopy exploits nonlinear saturable optical transition of fluorescent molecules
allowed to overcome Abbe's diffraction-limit and provides diffraction-unlimited resolution in far-field optical microscopy. We elaborate the mechanism of STED and the conditions of depletion. The formula of STED microcopy resolution is deduced through effective point spread function (E-PSF). The STED system resolution is mainly dominated by the quality of the fluorescence depletion patterns in the focal plane. The depletion pattern is mainly affected by STED beam intensity
polarization
phase plate
primary aberrations
STED pulse shape
pulse duration and delay time. In this paper
we found related models and simulate the relationship between the depletion patterns and the parameters
and put forward effective approach to enhance the system resolution. 2010 SPIE.
Remote sensing image restoration using estimated point spread function (EI CONFERENCE)
会议论文
2010 International Conference on Information, Networking and Automation, ICINA 2010, October 17, 2010 - October 19, 2010, Kunming, China
Yang L.
;
Ren J.
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浏览/下载:27/0
  |  
提交时间:2013/03/25
In order to reduce image blur caused by the degradation phenomenon in the imaging process
the acquired images of the space remote sensing camera are restored. First
the frequency-domain notch filter is adopted to remove strip noises in the images. Then degradation function
which is referred to as the point spread function (PSF) of the imaging system is estimated using the knife-edge method. To improve the accuracy of the estimation
the estimated PSF is adjusted with Gaussian fitting. Finally
the images are restored by Wiener filtering with the fitted PSF. The restoration results of the remote sensing images show that almost all strip noises are eliminated by the notch filter. After denoising and restoration
the variance of the remote sensing image worked with in this paper increases 30.979 and the gray mean gradient increases 3.312. Due to Gaussian fitting
the accuracy of the PSF estimation is heightened. Image restoration with the final PSF is benefit to interpreting and analyzing the remote sensing images. After restoration
the contrasts of the restored images are increased and the visual effects become clearer. 2010 IEEE.
The study of mapping relation of aeroplane complex motion and image movement and compensation technique (EI CONFERENCE)
会议论文
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.
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浏览/下载:17/0
  |  
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.
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