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长春光学精密机械与物... [2]
高能物理研究所 [1]
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会议论文 [2]
期刊论文 [1]
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2015 [1]
2009 [1]
2008 [1]
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Chemistry;... [1]
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Influence of polychromaticity on particle structure determination in small-angle X-ray scattering
期刊论文
JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2015, 卷号: 48, 页码: 1935-1942
作者:
Wang WJ(王文佳)
;
Chang GC(常广才)
;
Zhang LH(张连辉)
;
Dong YH(董宇辉)
;
刘鹏(多)
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  |  
浏览/下载:24/0
  |  
提交时间:2016/04/18
small-angle X-ray scattering
polychromatic beams
smear effect
structural analysis
Level 0 and level 1 data processing for a type of hyper-spectral imager (EI CONFERENCE)
会议论文
2009 International Conference on Optical Instruments and Technology, OIT 2009, October 19, 2009 - October 21, 2009, Shanghai, China
Li X.
;
Yan C.
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浏览/下载:63/0
  |  
提交时间:2013/03/25
Hyper-spectral imaging (HSI) is a kind of optical remote sensor that can simultaneously obtain spatial and spectral information of ground targets. We are now designing a data processing system for a type of space-borne push-broom HSI
then it performs radiometric and spectral calibration based on the ground calibration results and onboard calibration collection. The detailed algorithms for bad pixel replacement
which has 128 spectral channels covering the spectral range from 400nm to 2500nm. With its large amount of spectral channels
radiometric and spectral calibration were presented. After processing
the HSI collects large volume of spectral imaging data need to be efficiently and accurately processed and calibrated. In this paper
the digital numbers downlinked from the spacecraft can be converted into at-sensor absolute spectral radiance of ground targets
the detailed Level 0 and Level 1 data processing steps for the HSI were presented. The Level 0 processing refers to a set of tasks performed on the data downlinked from the spacecraft
thus providing accurate quantified spectral imaging data for various applications. 2009 SPIE.
including decoding to extract science data
separating the science data into files corresponding to different tasks (e.g. ground imaging
dark imaging
and onboard calibration)
checking data integrity and instrument settings
data format conversion
and Level 0 files creation. The Level 1 processing performs several steps on Level 0 data. Firstly
it corrects the image artifacts (mostly the SWIR smear effect)
subtracts the dark background
and performs the bad pixel replacement according to the prelaunch measurement
Driving techniques for high frame rate CCD camera (EI CONFERENCE)
会议论文
Electronic Imaging and Multimedia Technology V, November 12, 2007 - November 15, 2007, Beijing, China
Guo W.
;
Jin L.
;
Xiong J.
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浏览/下载:25/0
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提交时间:2013/03/25
This paper describes a high-frame rate CCD camera capable of operating at 100 frames/s. This camera utilizes Kodak KAI-0340
an interline transfer CCD with 640(vertical)480(horizontal) pixels. Two output ports are used to read out CCD data and pixel rates approaching 30 MHz. Because of its reduced effective opacity of vertical charge transfer registers
interline transfer CCD can cause undesired image artifacts
such as random white spots and smear generated in the registers. To increase frame rate
a kind of speed-up structure has been incorporated inside KAI-0340
then it is vulnerable to a vertical stripe effect. The phenomena which mentioned above may severely impair the image quality. To solve these problems
some electronic methods of eliminating these artifacts are adopted. Special clocking mode can dump the unwanted charge quickly
then the fast readout of the images
cleared of smear
follows immediately. Amplifier is used to sense and correct delay mismatch between the dual phase vertical clock pulses
the transition edges become close to coincident
so vertical stripes disappear. Results obtained with the CCD camera are shown.
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