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长春光学精密机械与... [30]
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专题:长春光学精密机械与物理研究所
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Characteristic point match algorithm based on the SURF in binocular stereo vision (EI CONFERENCE)
会议论文
5th International Conference on Intelligent Networks and Intelligent Systems, ICINIS 2012, November 1, 2012 - November 3, 2012, Tianjin, China
Wang X.
;
Yang L.
;
Wang L.
;
Xu J.
收藏
  |  
浏览/下载:20/0
  |  
提交时间:2013/03/25
One of the main components of the computer vision is 3D reconstruction. Extracts and the match based on two-dimensional picture characteristic point is the 3D reconstruction technology core. Taking binocular stereoscopic vision theory as a foundation
through extracts the characteristics of SURF based on the multi-scale analysis
this feature has specific scale reproducibility
put the epipolar constraints and disparity constraints as conditions judgement to specific screening
it is greatly reduced the search range. The experiment use the matching method for three different actual scenes
the results shows that the method can enhance the image matching speed and precision
and can get more precise dense parallax
used for reconstruction complete scene. 2012 IEEE.
The research of digltal CR medicine image adapitive enhancement method (EI CONFERENCE)
会议论文
4th International Conference on Mechanical and Electrical Technology, ICMET 2012, July 24, 2012 - July 26, 2012, Kuala Lumpur, Malaysia
Ming-Hui Z.
;
Yao-Yu Z.
收藏
  |  
浏览/下载:52/0
  |  
提交时间:2013/03/25
Digital CR medicine radiation image is in doctor's favor and has became medicine imaging technology new hot spot because of its high gray contrast
powerful computer disposal function
little radiation dosage
non-film diagnosis
different area consultation. But degradation of digital X-ray medical image such as low contrast and blurring during radiographic imaging
caused by complexity of body tissue and effects of X-ray scattering and electrical noise etc.
can worsen the results of analysis and diagnosis. So it is usually needed that CR medicine image is enhanced to improve its vision quality
and easy to doctor's more accurate diagnosis. The general enhancement algorithms over enhancing the contrast and lose image details
aiming at the defects
an enhancement algorithm for CR image is proposed based on the ratio of deviation to mean of domain. The arithmetic enhance CR image edge details by adjusting factor K based on the ratio of deviation to mean of domain of CR image. Experiment results demonstrate that the algorithm enhances CR image detail and CR image enhanced has good visual effect
the adaptive enhancement method is fit for CR medicine image. (2012) Trans Tech Publications
Switzerland.
Comparison and simulation of subpixel imaging modes for linear CCD (EI CONFERENCE)
会议论文
2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China
Li Y.
;
He B.
;
Liu T.
收藏
  |  
浏览/下载:27/0
  |  
提交时间:2013/03/25
Subpixel technique of linear CCD is effective to enhance the spatial resolution without increasing the focal length of optics and reducing the pixel size. To compare image quality of two main subpixel imaging modes
quincunx sampling and four-point sampling
a method to quantitatively evaluate image quality of subpixel based on MTF was proposed. The MTF of quincunx and four-point sampling modes were derived. Analytical results shows that theoretical limiting resolution of quincunx sampling and four-point sampling is improved to 1.4 and 1.86 times respectively
and MTF values at Nyquist frequency of two modes are increased by 0.1106 and 0.1679
respectively. MTFA in (0
0.5) of two subpixel imaging modes were calculated and results illustrates that four-point sampling offers much more improvement with image quality than quincunx sampling
at the cost of double amount of data. A model for simulating subpixel imaging using Matlab was established
and simulation results of spoke target verify the theoretical analysis. (2012) Trans Tech Publications
Switzerland.
Bi-camera ranger-finder and error analyze based on binocular parallax (EI CONFERENCE)
会议论文
2011 International Conference on Vibration, Structural Engineering and Measurement, ICVSEM2011, October 21, 2011 - October 23, 2011, Shanghai, China
Wang Z. C.
;
Dai M.
;
Huang J.
;
Wang Y. Y.
;
Chen X. L.
;
Gao Y. J.
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  |  
浏览/下载:26/0
  |  
提交时间:2013/03/25
The traditional facilities that used to find range are mostly based on laser or ultrasonic. Now
based on binocular parallax of human eyes
we advance a method used to get the distance by measuring the offset on image panel. On this foundation
we also analyze the error in forward. The academic analysis indicate that the measurement would be impacted severely by transverse offset and angle-measuring offset
in contrast
much slightly by lengthways offset. When we put this facility into practice
this facility can suffice practical demand completely if we select the space between bi-camera and the focus of facility rationally. (2012) Trans Tech Publications
Switzerland.
Space camera dynamic image quality measurement and evaluation (EI CONFERENCE)
会议论文
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
Su W.
;
Zhang X.
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  |  
浏览/下载:14/0
  |  
提交时间:2013/03/25
By using analysis of the infinity image of the space camera
we intend to obtain the curve of the dynamic modulation transfer function. We extract the pixel gray values at the image edge which distribute as a knife-edge function
and make differential calculation and Fourier transformation of it
and then we can obtain the dynamic MTF curve of the optical system. The value of the curve at the Nyquist frequency is the most important parameter that reflects the image quality. We add push-scanning imaging and environmental effects to the static MTF of space camera and compare the MTF value with the dynamic MTF at Nyquist frequency. The comparison result can help us verify the accuracy of the calculating results and the feasibility of our method. (2011) Trans Tech Publications.
Space optical remote sensor of the CAE thermal control index calculation method (EI CONFERENCE)
会议论文
2011 International Conference on Advanced Design and Manufacturing Engineering, ADME 2011, September 16, 2011 - September 18, 2011, Guangzhou, China
Li L.
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  |  
浏览/下载:18/0
  |  
提交时间:2013/03/25
The thermal control indicators CAE methods of Space optical remote sensor are analyzed in the presented work. We sat up a thermal optical analysis model for space optical remote sensor. By assuming fully covered by in-orbit temperature load
and using the finite element method for thermal deformation analysis
we obtained the optical remote sensor surface deformation and displacement under various thermal loading. Using ZERNIKE polynomial
wave was fitted to obtain ZERNIKE polynomial coefficients which were incorporated into the optical system design. Using CODE V optical calculation software
heat-ray machines under elastic deformation of the system point spread function
transfer function (MTF)
wave front differential (WFE) etc. were calculated. Image quality changes of remote sensors are discussed in variety assumed cases such as temperature loads of quality change. By repeated iteration
critical value of temperature fields meeting the design requirements are obtained for the optical system. Optical indicators were converged to the temperature field indicator
then reasonable indicators of thermal control for remote sensors were obtained. For the thermal control design
this method provided a reliable basis for design. (2011) Trans Tech Publications
Switzerland.
Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE)
会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Gu S.
;
Yan Y.
;
Xu K.
;
Jin G.
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浏览/下载:37/0
  |  
提交时间:2013/03/25
With the development of aerospace remote sensing technology
the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures
the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera
the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera
the compensation method of image motion to space camera is researched. First
the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second
the system adopts 80C31 as controller of drift angle
and adopts stepping motor for actuators
and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced
and it achieve the closed-loop control of the drift angle position. At the last
this paper analyses the transmission precision of the mechanism. Through the experiment
we measured the actual precision of the image motion compensation mechanism
and compared with the theoretical analysis. There are two major contributions in this paper. First
the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism
it will bring adverse effects for the precision and stiffness of mechanism. For this problem
This paper designed a image motion compensation that have some advantages such as small size
light weight at the same time
high precision
stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second
the traditional mechanism control need to corrected
fitting and iterative for the control formula of mechanism. Only in this way
we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting
It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5
-4
-3
-2
-1
0
+1
+2
+3
+4
+4 as the expectation value of the imaginary drift angle
we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'
and it can achieve the high-precision image motion compensation. 2011 SPIE.
Evaluation of the operating range for ground-based infrared imaging tracking system (EI CONFERENCE)
会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
Zhang B.
;
Zhang Z.-D.
;
Zhang S.-M.
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  |  
浏览/下载:33/0
  |  
提交时间:2013/03/25
Ground-based infrared imaging tracking system (GIITS) is of great importance for aerial target warning and guard. The operating range is one of the key performance specifications
on the other
which should be calculated
calculate the radiation power received on the detector in order to analysis whether the output signal meets the detection requirements or not
analyzed and studied during the whole GIITS design process. The operating range is mostly influenced by a few factors
without considering the effect of the background radiation. By improving of the traditional method
including atmospheric attenuation
a new operating range calculation model of the GIITS was established based on two requirements. One is that the image size of observed target should meet the requirement of the processor signal extraction. The number of the pixel occupied by target image should be more than 9. The other is that the signal noise ratio (SNR) of the GIITS should not be less than 5 to meet the requirements of the target detection probability and spatial frequency. The SNR calculation equation in form of energy is deduced and the radiation characteristic of the observed target and background are analyzed. When evaluate the operating range of the GIITS using the new method
the performance of GIITS and feature of target and background. This paper firstly makes analysis and summarization on the definite localizations of the traditional operating range equation of the GIITS. The localizations are mainly in two aspects. On one hand
we should successively calculate two operating range values according to two requirements mentioned above and choose the minimum value as the analytic result. In the end
the dispersion of the image and the effect of image dispersion are not considered in the traditional method
an evaluation of operating range for fighter aircraft is accomplished as an example. The influence factors in every aspect on operating range were explored by the calculated result. The new operating range calculation model provides the theoretical basis for the design and applications as well as the comprehensive evaluation of a GIITS. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
An improved destripe noises method for TDI-CCD images (EI CONFERENCE)
会议论文
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
He B.
收藏
  |  
浏览/下载:18/0
  |  
提交时间:2013/03/25
The new destriping method using lifting wavelet transform by means of the improved threshold function is presented in this letter. It can overcome the deficiency of the hard and soft threshold function. As compared with the known threshold functions
the quality of the denoised images using the improved threshold function is much better. The results based on several image quality indexes present that the destriped images are not only visually more plausible but also suitable for analysis. Also it is reasonable in computer time and storage space to use the lifting wavelet transform. 2011 IEEE.
The research of the accurate measure of static transfer function for the TDI CCD camera (EI CONFERENCE)
会议论文
3rd International Photonics and OptoElectronics Meetings, POEM 2010, November 2, 2010 - November 5, 2010, Wuhan, China
Guo-Ning L.
;
Long-Xu J.
;
Jian-Yue R.
;
Wen-Hua W.
;
Shuang-Li H.
收藏
  |  
浏览/下载:17/0
  |  
提交时间:2013/03/25
In the test course of static transfer function of TDI CCD camera
because of the influence that gets environmental and artificial etc. factor
the value of static transfer function measured at any time is between unceasing fluctuation
so
make accuracy reduce. To solve this problem
a kind of accurate measurement technique of static transfer function is put forward. First
before carrying out the measure of static quiet of transfer function
the best test point of transfer function of the TDI CCD camera must be determined
it is parallel to guarantee the rectangle target surface of parallel optical pipe and camera focal plane maintenance parallel
and again guarantee target strip in rectangle target and TDI CCD in camera focal plane maintenance vertical. TDI CCD catches rectangle target image
per 1000 lines of target mark image as a measures sample of static transfer function
exclude because of atmosphere tremble twisted
vague rectangle target mark image
retain 500 distinct and steady target mark image as measure sample set. Then
calculate the static transfer function of each measure sample respectively
take the average of all static quiet transfer function in measure sample set as the static transfer function of camera. Finally
the measure of the static transfer function for TDI CCD camera makes error analysis. Experimental results indicate that the value of the static transfer function of TDI CCD camera measured with this kind of method is 0.2923
with before measurement technique comparison
the value of static transfer function has raised 0.02
makes the accuracy of the measure of static transfer function have gotten raising.
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