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Opto-Electronic Engineering
Contents
2012
Volume: 39 Issue 6
25 Article(s)
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 1 (2012)
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Exploration of High Resolution Optical Remote Sensing of the Geostationary Orbit
TAO Jia-sheng, SUN Zhi-guo, SUN Ying-hua, TAO Zhuo, and HU Chang-hua
In order to achieve high resolution optics remote sensing of the Geostationary Orbit (GEO), the difference of dynamics conditions between the low orbit and GEO has been researched. The problem about volume of camera enlarged by the long time of powered phase, disadvantageous dynamics conditions, frame mapping and long
In order to achieve high resolution optics remote sensing of the Geostationary Orbit (GEO), the difference of dynamics conditions between the low orbit and GEO has been researched. The problem about volume of camera enlarged by the long time of powered phase, disadvantageous dynamics conditions, frame mapping and long distance has been analyzed. The simulation camera of GEO Resolution 21.5 m has been researched, and then the dynamics conditions test has been taken and the testing parameters of camera key position have been obtained. It is proved that research of payload which is the key part of the high resolution optics remote sensing of GEO is feasible..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 1 (2012)
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Passive Orbit Measurement of Geosynchronous Satellite Joint Angles from Optical Measurement and Time Difference of Arrival from Signals PENG
Hua-feng, SUN Tao, and CAO Jin-kun
Precision orbit measurement and determination of geosynchronous satellite is the foundation for satellite navigation, positioning, and so on. Both methods based on optical measurement and based on Time Difference of Arrival (TDOA) with satellite’s communication signal have advantages and disadvantages. A new orbit meas
Precision orbit measurement and determination of geosynchronous satellite is the foundation for satellite navigation, positioning, and so on. Both methods based on optical measurement and based on Time Difference of Arrival (TDOA) with satellite’s communication signal have advantages and disadvantages. A new orbit measurement method is proposed joint the optical measurement and TDOA measurement, which can solve satellites position with only one time measurement of angles from one optical station and one TDOA from two radio stations, and improve the orbit precision. The analytic expression of range from satellite to optical station is derived, thus the position can be solved, too. By GDOP analysis method, the position precision is analyzed with different stations’ layout, and a layout suggestion is proposed. The orbit precision’ improvement from joint measurement is improved by Monte-Carlo statistical orbit determination, which has been compared with purely optical measurement. The simulation result shows that, if there is system error, after orbit determination with 24h’s measurement data, the position error is about 25 m from orbit determination and 200 mfrom 7days prediction, which is only 2/3 to purely optical measurement. If there is system error, the self-calibration method is used for orbit determination, and the position error is 6 m from orbit determination and 140 m from 7days prediction, the estimated system error is 0.1 after normalization, while purely optical method has failed with self-calibration method..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 7 (2012)
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Analysis and Simulation of Superresolution by Code Division Multiplexing
TAO Ran, DU Shu-song, and ZHANG Wen-xi
Geometric superresolution is an important technology to improve resolution of remote sensing. Code division multiplexing is a new method of the technology. This method does not involve additional mechanical elements, such as those used for microscans. Fixing the code-division-multiplexing board using the Fourier optics
Geometric superresolution is an important technology to improve resolution of remote sensing. Code division multiplexing is a new method of the technology. This method does not involve additional mechanical elements, such as those used for microscans. Fixing the code-division-multiplexing board using the Fourier optics is discussed and the 1D and 2D images are simulated. Then, the influnceing factors on the result of simulations are analyzed, and the solutions are given briefly..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 17 (2012)
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Design of Draft Adjusting Mechanism for Space Optical Camera
BAO He, YANG Li-wei, JIANG Xiao-nan, DONG De-yi, ZHANG Yin-he, and LI Zhi-lai
In order to reduce the effect of draft on imaging quality of space optical camera, the reason and compensation method of draft are analyzed, and influence of draft on space camera is studied. An adjusting mechanism to compensate draft is designed for a space camera. Bidirectional screw driving is adopted to adjust draf
In order to reduce the effect of draft on imaging quality of space optical camera, the reason and compensation method of draft are analyzed, and influence of draft on space camera is studied. An adjusting mechanism to compensate draft is designed for a space camera. Bidirectional screw driving is adopted to adjust draft of focal plane of the camera, enabling the draft adjusting mechanism having characteristics high strength and stiffness, compact, and good stability. Finite element analysis shows that the mechanism has high stiffness and dynamic strength. Accuracy of the mechanism are measured by closed-loop method and compared before and after the vibration tests. The results indicates that the accuracy of the mechanism is superior to 1′, and the range of draft adjusting is superior to +5°~-5°, fulfilling the designrequirements and achieving high accuracy of image motion compensation..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 22 (2012)
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Influence of Aircraft Sharp Turns on the Image Quality of the Aerial Camera
LI Wen-ming, XU Zheng-ping, CHEN Xi-hui, and HUANG Hou-tian
Flight attitude sets a fundamental limit on the image quality of the aerial camera. Both of the imaging resolution and overlap rate would be degraded when aircraft takes sharp turning. First, the effects of aircraft sharp turning on the imaging resolution and overlap rate was analyzed with the methods of formula inferr
Flight attitude sets a fundamental limit on the image quality of the aerial camera. Both of the imaging resolution and overlap rate would be degraded when aircraft takes sharp turning. First, the effects of aircraft sharp turning on the imaging resolution and overlap rate was analyzed with the methods of formula inferring and coordinatetransformation. Then the smear model is proposed according to a panoramic aerial camera. Analyzing result indicates that the biggest smear approaches to 4 pixels in the forward motion direction when aircraft takes sharp turning, so it must be eliminated. While the smear just approaches to 1/8 pixels across the forward motion direction, and it could be neglected. The smear model was predigested according to the analyzing result, so it could provide academic basis for smear compensation. In order to reduce the effects of aircraft sharp turning on the imaging overlap rate, the method of adjusting exposure time according to aircraft turning radius and rotate rate was proposed. Those analyses establish an academic basis for panoramic aerial camera to gain high quality image when aircraft takes sharp turning..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 29 (2012)
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The Embedded Processing Platform Design Based on FPGA and DSP of an Adaptive Optics System On-line Performance Evaluation
MU Jie, RAO Chang-hui, LI Mei, and ZHENG Wen-jia
For on-line real time performance evaluation of an adaptive optics system, an embedded processing platform based on FPGA and DSP is proposed and designed, in which the FPGA is a co-processor for the high-speed data buffer, and the DSP is a main processor for the later complex signal processing. According to the closed-
For on-line real time performance evaluation of an adaptive optics system, an embedded processing platform based on FPGA and DSP is proposed and designed, in which the FPGA is a co-processor for the high-speed data buffer, and the DSP is a main processor for the later complex signal processing. According to the closed-loop data of residual slope detected by Hartmann wavefront sensor, the on-line evaluation of performance parameters of an adaptive optics system is realized on this proposed platform, including point spread function, Strehl ratio, full width half maximum and modulation transfer function. The results indicate that the error levels of point spread function, Strehl ratio, full width half maximum are 10-11, 10-3, 10-4 times as diffraction limit and 10-4, respectively. As well as highly operational precision, this embedded processing platform has a simple structure, which is good for integration, and strong commonality..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 34 (2012)
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Error Autocompensation of FOG-based Rotating Inertial Measurement Unit for Ballistic Missile
LIU Jie-yu, YANG Jian-ye, WANG Li-xin, and YU Guo-qiang
To solve the problems that the prelaunch calibration accuracy of ballistic missile is seriously influenced by external disturbance, especially the temperature stability of Fiber Optic Gyro (FOG) is so low that the parameters are changed by temperature influence and the error compensation is not satisfying, a rotating i
To solve the problems that the prelaunch calibration accuracy of ballistic missile is seriously influenced by external disturbance, especially the temperature stability of Fiber Optic Gyro (FOG) is so low that the parameters are changed by temperature influence and the error compensation is not satisfying, a rotating inertial measurement unit based on FOG for the missile is proposed. A rotating axis is added to the strapdown Inertial Measurement Unit (IMU), the IMU rotates around the axis, and the residual error after prelaunch compensation is modulated into periodic terms. Then, error autocompensation is realized. Through theoretical analysis and simulation, not only the constant error and part of misalignment errors of inertial instruments orthogonal to rotating axis, but the first-order, second-order and part of cross-coupling error of intersecting axis of Accelerometers can be compensated by rotating, and the coupling error between rotating speed and error of scale factor and misalignment of FOG can be eliminated completely by selecting appropriate rotating scheme..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 41 (2012)
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Configuration and Performance Analysis of the Silicon THz Waveguide
LI Ming-liang, and WANG Cong
To solve limitations of existing terahertz radiation in the tunable range of output frequency and output power, it started from Maxwell's equations of nonlinear medium to analyze the optical properties of the nonlinear polymer theoretically, and a mathematical model of silicon waveguide configuration was establishe
To solve limitations of existing terahertz radiation in the tunable range of output frequency and output power, it started from Maxwell's equations of nonlinear medium to analyze the optical properties of the nonlinear polymer theoretically, and a mathematical model of silicon waveguide configuration was established. The high refractive index of silicon was used to design the silicon terahertz waveguide. It also analyzed the mode map of terahertz waveguide, and discussed the effective index, waveguide loss, and the relationship between continuous-wave’s output power and output frequency of silicon terahertz waveguide mode. The experimental results show that terahertz generated from silicon terahertz waveguide is tunable in the range of 0.1 THz to 15 THz continuously at room temperature, and its output power can reach several micro-watts..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 47 (2012)
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High-frequency Accelerator Sensor of Double Fiber Bragg Gratings
LUO Pei, TIAN Jian-wei, and WANG Li-xin
A double Fiber Bragg Gratings (FBG) accelerator sensor was designed and fabricated. The theoretical analysis about working theory and basic characteristic has been carried out. The experimental measurement indicated that the vibration signals with high stability in the frequency range of 5~2 000 Hz were detected with t
A double Fiber Bragg Gratings (FBG) accelerator sensor was designed and fabricated. The theoretical analysis about working theory and basic characteristic has been carried out. The experimental measurement indicated that the vibration signals with high stability in the frequency range of 5~2 000 Hz were detected with the new double FBG accelerator sensor. The double FBG accelerator sensor not only may overcome the disadvantage of traditional cantilever FBG accelerator sensor that can hardly measure high-frequency vibration signals, but also has some advantages such as temporary self-compensatory, high resonance frequency, handle expediency, and so on. The work indicates that the double FBG accelerator sensor will have broad applications in measuring high-frequency vibration..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 53 (2012)
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An Embedded FBG Strain Sensor for Bridge Cable Tension Measurement
LIU Li, CHEN Wei-min, ZHANG Peng, WU Jun, and LIU Hao
A Fiber Bragg Grating (FBG) embedded strain sensor is put forward. This method can make sure the survival of the sensor and solve the problem of over range measurement. It is mounted into the bridge anchor zone to detect the decay strain derived from cable body. Based on the analysis of bridge cable, design requests of
A Fiber Bragg Grating (FBG) embedded strain sensor is put forward. This method can make sure the survival of the sensor and solve the problem of over range measurement. It is mounted into the bridge anchor zone to detect the decay strain derived from cable body. Based on the analysis of bridge cable, design requests of this sensor are known as package structure, modulus of elasticity of package which must be matched up with the anchor material. Finally, epoxy glue with micro silicon is used as the package layer. To make sure the performance of the sensor, tensile tests are conducted by tensile testing machine, the results show that the linearity of sensor is 0.999 74, and the sensitivity is 2.74 pm/N, good in repeatability. And then the sensors are put into the cable anchor, tensile test of the cable is implemented, and the sensor is good at linearity and repeatability..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 57 (2012)
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Simulation and Subsection between Fields Measured Endmember Spectrum and Multi-spectrum Image of TM
ZHANG Fei, TASHPOLAT·Tiyip, DING Jian-li, MAMAT·SAWUT, JIANG Hong-nan, HAN Gui-hong, and GUI Dong-wei
The characteristic of ground-objects spectrum is the basis of application of remote sensing. The imaging simulation principles of the optics image were described and a method using field measured endmember spectrum with higher spectrum resolutions was proposed to simulate spectrum of multi-spectrum images with lower sp
The characteristic of ground-objects spectrum is the basis of application of remote sensing. The imaging simulation principles of the optics image were described and a method using field measured endmember spectrum with higher spectrum resolutions was proposed to simulate spectrum of multi-spectrum images with lower spectrum resolution. The authors take the delta oasis of Weigan and Kuqa rivers as a study area, and choose vegetation and soil as study object. Firstly, we accomplished the simulation from field measured endmember for multi-spectrum by using the spectral response function of TM, and found the large correlation between simulated multi-spectrum and pixel spectrum of TM by using the statistical analyze. The linear model is set up to accomplish the quantitative transformation from endmember scale to pixel scale. Secondly, the translation relationship between the data computed from RS images and the data measured directly from the earth surface were analyzed. A method was proposed by using images with lower spectrum resolution to simulate images with higher spectrum resolutions..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 62 (2012)
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An Efficient Hyperspectral Band Selection Method Based on Matrix Mode
YU Shao-hui, ZHANG Yu-jun, ZHAO Nan-jing, XIAO Xue, and WANG Huan-bo
It is an important task to remove the redundant information in hyperspectral images. In this work, a band selection method for hyperspectral data based on matrix mode (BSMM) is proposed by combining the coefficient of variance and the correlation coefficient and a matrix factor is defined. By using the coefficient of v
It is an important task to remove the redundant information in hyperspectral images. In this work, a band selection method for hyperspectral data based on matrix mode (BSMM) is proposed by combining the coefficient of variance and the correlation coefficient and a matrix factor is defined. By using the coefficient of variance and the correlation coefficient, we analyze the separability and correlation of hyperspectral images and compare the standard deviation and coefficient of variation when the measurement of spatial dimension information is discussed. In addition, interval mapping is adopted to remove the difference of variation interval between the coefficient of variation and the correlation coefficient. The efficiency of this method is demonstrated by the analysis of AVIRIS hyperspectral data..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 71 (2012)
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Gas Detector Based on Differential Mode Excitation Photoacoustic Spectroscopy
DANG Hui, and LI Hong-yan
A new gas detector based on a novel photoacoustic scheme named Differential Mode Excitation Photoacoustic Spectroscopy (DME-PAS) is presented. This method takes advantage of the selective excitation of two different modes in a resonant photoacoustic cell and the gas concentration is derived from the amplitude ratio of
A new gas detector based on a novel photoacoustic scheme named Differential Mode Excitation Photoacoustic Spectroscopy (DME-PAS) is presented. This method takes advantage of the selective excitation of two different modes in a resonant photoacoustic cell and the gas concentration is derived from the amplitude ratio of these acoustic modes indirectly. The method can detect different gas with optical filter. Efficient data processing cell DSP was chosen as central cell, reducing the system components and making faster a reaction. Meanwhile, it’s convenient to change detecting algorithm according to modifying program. Experiments show that the obtained limit of detection is 23 ppm·m-1 at 98 000Pa and 295 K..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 76 (2012)
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The Application of Auto-focusing System in the LIBS Techniques
ZHENG Yi, ZHOU Wei-dong, LI Ke-xue, QIAN Hui-guo, LI Xia-fen, and QIN Xue-fei
In order to overcome the shortage of the large variation of spectrum intensity in Laser Induced Breakdown Spectroscopy (LIBS) and to improve the measurement accuracy in term of the relative standard deviation of the line intensity from repeating measured spectrum, an auto-focusing system is integrated into the LIBS tec
In order to overcome the shortage of the large variation of spectrum intensity in Laser Induced Breakdown Spectroscopy (LIBS) and to improve the measurement accuracy in term of the relative standard deviation of the line intensity from repeating measured spectrum, an auto-focusing system is integrated into the LIBS technique and used to control the size and position of the laser focus on the sample surface. Based on the gray level difference analysis method and a modified hill-climbing algorithm, an auto-focusing system, including hardware and software, is developed and used to automatically locate the laser focus point and then adjust the sample positions in LIBS measurements. The RSD of the repeating measurements is then improved..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 80 (2012)
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An Optical System Design with a Large-field Visible Light Target Simulator
Lü Yin-huan, ZHANG Tao, and TONG Guang-hui
Dynamic visible light target simulator with specific field is a key device for the testing and evaluation of the visible light imaging system, and the collimated projection optical system of this simulator determines the performance of the dynamic scene projector based on Digital Micromirror Device (DMD). According to
Dynamic visible light target simulator with specific field is a key device for the testing and evaluation of the visible light imaging system, and the collimated projection optical system of this simulator determines the performance of the dynamic scene projector based on Digital Micromirror Device (DMD). According to the imaging system test and evaluation requirements, the visible light collimated projector optical system is designed here. After the parameter calculation of optical projection system, a 58° large-field optical system of visible target simulator is designed according to the requirement of imaging system. The matched simulation is done between the design results with the imaging optical system, and the matched result is good. Experimental results show that the designed optical system meets the requirements of simulator and dynamic scene simulation completely..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 85 (2012)
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Three-dimensional SMS Design to Optimize LED Lighting
JIANG Shui-xiu, SUN Xiang, FENG Hua-jun, and JIA Ning
The 2D Simultaneous Multiple Surfaces (SMS) design can realize the goal of palindrome lighting. But it can’t realize the goal of lighting without rotational symmetry, such as rectangular beam desires. Thus, a 3D SMS method is introduced to optimize the LED lighting. A design example is presented to further verify the 3
The 2D Simultaneous Multiple Surfaces (SMS) design can realize the goal of palindrome lighting. But it can’t realize the goal of lighting without rotational symmetry, such as rectangular beam desires. Thus, a 3D SMS method is introduced to optimize the LED lighting. A design example is presented to further verify the 3D SMS method, and a different rectangular illumination is produced by changing a different seed rib. The model of the freeform lens is constructed and the optical simulation is carried out. The results show that the light beams are controlled well by the 3D SMS method, the freeform lens is compact and efficient, and a target illumination without rotational symmetry is achieved..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 91 (2012)
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Optical Signal Acquisition System Design of Charge-exchange Recombination Spectroscopy on HL-2A Tokamak Facility
WU Yuan-jie, ZHU Jian-hua, HAO Yi, YAO Lie-ming, and HAN Xiao-yu
The Charge-exchange Recombination Spectroscopy (CXRS) is an advanced technique for measuring Tokamak plasma temperature and spatial distribution. In order to satisfy the research demands of CXRS system of China HL-2A Tokamak, such as wide spectral range (470~660 nm), wide view field (535.34 mm), wide light beam diamete
The Charge-exchange Recombination Spectroscopy (CXRS) is an advanced technique for measuring Tokamak plasma temperature and spatial distribution. In order to satisfy the research demands of CXRS system of China HL-2A Tokamak, such as wide spectral range (470~660 nm), wide view field (535.34 mm), wide light beam diameter (110 mm), good spatial resolution (14 channels) and matching with the numerical aperture (0.22) of follow-up optical fibers, an optimized optical signal acquisition system consisting of one mirror and four lenses is designed by using the optical design software ZEMAX, and the aberration is also effectively reduced by tilting the image plane. Numerical calculation shows that the maximum RMS radius of image plane is only 88.14 μm, the numerical aperture of image domain is 0.217, and all the design results meet the application requirements well..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 96 (2012)
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Multi-sensor Image Fusion Based on Multi-objective Particle Swarm Optimization Algorithm
WANG Xian, ZHANG Fang-sheng, MU Xin, LIU Xu-qing, and GUO Yu-fan
A novel multi-sensor image fusion method based on multi-objective particle swarm optimization is proposed to solve the parameter optimization problem in the image fusion. Firstly, the Nonsubsampled Contourlet Transform (NSCT) is used to perform multi-scale and multi-directional decomposition on the source images. Then
A novel multi-sensor image fusion method based on multi-objective particle swarm optimization is proposed to solve the parameter optimization problem in the image fusion. Firstly, the Nonsubsampled Contourlet Transform (NSCT) is used to perform multi-scale and multi-directional decomposition on the source images. Then select the objective evaluation criteria as the optimal objective function. Multi-objective particle swarm optimization algorithm is used to optimize the fusion parameters of low-frequency coefficients. For band-pass directional sub-band coefficients selection, the rule of maximum absolute value is used. Finally, the fused image is obtained through inverse transform. The algorithm has been used to merge multi-focus images and infrared and visible light images. The experimental results indicate that the fused image obtained by the proposed method has a better subjective visual effect and objective evaluation criteria..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 102 (2012)
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Simulation of Infrared Scene for Multiple Moving Platforms
HU Xu-feng, TANG Yong-he, and LU Huan-zhang
In order to validate and evaluate the algorithm of infrared information processing under the condition of multiple moving platforms, study and implementation on simulation of infrared scene for multiple moving platforms were carried out. First, the existed technologies for simulation of infrared scene were reviewed, an
In order to validate and evaluate the algorithm of infrared information processing under the condition of multiple moving platforms, study and implementation on simulation of infrared scene for multiple moving platforms were carried out. First, the existed technologies for simulation of infrared scene were reviewed, and it was figured out that the existed technologies were mainly focused on single platform. Then the targets model and the feature of algorithms for infrared information under the condition of multiple moving platforms were analyzed. The targets’ radiation model, group targets’ moving model and a new observation model based on virtual observation platform were proposed. The basic process of infrared scene simulation for multiple moving platforms was proposed based on these models. Finally, the simulation result was given for verifying the proposed process. And the result shows that the proposed simulation method could satisfy the requirements to validate and evaluate the algorithm of infrared information processing under the condition of multiple moving platforms..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 111 (2012)
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High-resolution Aerial Image Compression Based on Technology of the Rate Pre-allocation
LI Qi-hu, REN Guo-qiang, WU Qin-zhang, and XU Yong-gang
As it is necessary to compress the large aerial image data from the large-array aerial CCD camera, an image compression algorithm named as Rate Pre-allocated Compression Algorithm (RPCA) based on bit plane coding is proposed by studying variety of image compression algorithms. First, the relative redundancy between pix
As it is necessary to compress the large aerial image data from the large-array aerial CCD camera, an image compression algorithm named as Rate Pre-allocated Compression Algorithm (RPCA) based on bit plane coding is proposed by studying variety of image compression algorithms. First, the relative redundancy between pixels of the image should be refused by using multi-level wavelet transform to original image. Second, according to the theory of rate distortion and principle which is the more important to image reconstruction in various sub-bands, the number of bit-rate for different sub-bands should be allocated in the process of actual coding that has been computed. Finally, the coefficients bits are coded by adaptive MQ arithmetic coder. So the careful embedded code stream is produced. Experiment results shows that this algorithm rate allocation is accurate, and the quality of image compression is comparable to the JPEG2000 standard, supporting any lossless to loss image compression ratio, but the complexity is far lower than the JPEG2000 standard and suitable for hardware implementation..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 118 (2012)
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An Interior Point Method for Image Super-resolution via Sparse Representation
REN Guang-mei, LI Xiao-feng, FU Zhi-zhong, and ZENG Lei
A lot of attention has been paid to sparse representation in single image super-resolution. A scheme is employed to implement the image super-resolution via sparse representation. First, the sparse representation from low-resolution input patches is sought by sparse representation algorithms. Then the corresponding hig
A lot of attention has been paid to sparse representation in single image super-resolution. A scheme is employed to implement the image super-resolution via sparse representation. First, the sparse representation from low-resolution input patches is sought by sparse representation algorithms. Then the corresponding high-resolution outputs are generated from them. Finally, the whole high-resolution image from patches is reconstructed. To get the sparse coefficients, an Interior Point Method (IPM) is adopted, which uses preconditioned conjugate gradients algorithm to compute the search direction. Simulation results show that our scheme outperforms the existing bicubic interpolation, Least Angle Regression(LARS) and other algorithms in both visually and qualitative evaluations. Typical Root-Mean-Square Error (RMSE) reduction of 0.29 and 0.7 is achieved over Bicubic and LARS algorithms, respectively..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 125 (2012)
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Detection of Ports with Jetties Based on SAR Image
LIU Cheng-hao, LIU Wen-bo, and ZHANG Gong
As the area of port for ships to stop, the recognition of jetty location is of great importance to the extraction of port. With the jetty distributing characteristics, a novel method for port detection is proposed. Firstly, improved regional growing method is used to acquire the binary image of land and water on the ba
As the area of port for ships to stop, the recognition of jetty location is of great importance to the extraction of port. With the jetty distributing characteristics, a novel method for port detection is proposed. Firstly, improved regional growing method is used to acquire the binary image of land and water on the basis of image pretreatment. Then, the contour line is obtained through the edge tracking method. The jetty characteristics are extracted on the foundation of the contour line's slope. The target characteristic points of jetty are selected utilizing the prior knowledge of jetty. Finally, the ports are recognized. Experimental results indicate that the port contour gotten by the proposed method is more accurate than the existing methods..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 131 (2012)
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On-line Dead Time Compensation Method
WANG Ran-jun, and LIU En-hai
To reduce current distortion caused by dead time of pulse width modulation inverter in control system, a new on-line dead time compensation method is presented after analyzing the mechanism of dead time effects and harmonics. The proposed method estimates amplitude of error voltage in stationary reference frame. Then c
To reduce current distortion caused by dead time of pulse width modulation inverter in control system, a new on-line dead time compensation method is presented after analyzing the mechanism of dead time effects and harmonics. The proposed method estimates amplitude of error voltage in stationary reference frame. Then calculate the disturbancevoltage using the relationship between the amplitude and rotor position. Finally, the distortion is compensated by adding it to the current loop. This approach does not require additional hardware circuits, off-line measurements and detection of the current polarity. Also it can eliminate the disadvantage of compensation induced by abrupt change of voltage and its realization is simple. The simulation and experimental results show the effectiveness of minimizing harmonic distortions and improving current better..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 136 (2012)
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Video Signal Processing Circuit Design of CCD Camera
WEI Wei, LIU En-hai, and ZHENG Zhong-yin
In order to improve imaging performance of CCD camera, the CCD noise is categorized and analyzed, and high SNR video signal processing circuit is designed. The principle of Correlated Double Sample (CDS) circuit, which is aimed at processing reset noise and 1/f noise, is discussed. Video signal processing circuit is de
In order to improve imaging performance of CCD camera, the CCD noise is categorized and analyzed, and high SNR video signal processing circuit is designed. The principle of Correlated Double Sample (CDS) circuit, which is aimed at processing reset noise and 1/f noise, is discussed. Video signal processing circuit is designed with specific video processing chip VSP2270 and FPGA as the core. At last, the experiments of image acquisition and SNR test are introduced together with CCD driving circuit. The results show that the video signal processing circuit effectively inhibits reset noise and 1/f noise, but the circuit noise itself is small. The system SNR reaches up 58.4 dB when data rate is 20 MHz, which meets the requirements of star map imaging..
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Opto-Electronic Engineering
Publication Date: Jan. 01, 1900
Vol. 39, Issue 6, 144 (2012)
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