Journals >Opto-Electronic Engineering
Contents
2008
Volume: 35 Issue 1
29 Article(s)
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Research Article
Sliding Mode Variable Structure Control for the Separating-mirror of Infrared Target Simulator
WU Zhen-yuan, MEI Xiao-rong, and FENG Ru-peng
Based on quick response performance and insensitivity to variation of plant parameters and external disturbance of the variable structure control,a variable structure controller with sliding mode (SMC) is designed for the separating-mirror servo system of infrared target simulator.The chattering of variable structure cBased on quick response performance and insensitivity to variation of plant parameters and external disturbance of the variable structure control,a variable structure controller with sliding mode (SMC) is designed for the separating-mirror servo system of infrared target simulator.The chattering of variable structure controller with sliding mode is reduced by using exponential reaching law with saturation function.Mathematical model of the separating-mirror is constructed by the mechanism analysis method.The application of S-function simplifies the simulation modeling of the complex system and improves the simulation speed.By the simulation research and comparison with simulation results of the PID controller,simulation result shows that,variable structure controller with sliding mode has a strong robustness for external disturbance and parameter changes of the separating-mirror,and it can guarantee simulation precision and fidelity of experiment results of infrared guidance simulation system..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 1 (2008)
State Prediction and Estimation for Opto-electronic Tracking Maneuvering Targets Based on Robust H∞Filter
XU Bo, and JI Wei
Considering the maneuvering target characteristic,measurement time-delay and noises of TV seeker in the opto-electronic tracking system,the current statistical model was utilized to build the acceleration model of the unknown target motion.Robust H∞filter based on acceleration non-zero mean value time-correlation modelConsidering the maneuvering target characteristic,measurement time-delay and noises of TV seeker in the opto-electronic tracking system,the current statistical model was utilized to build the acceleration model of the unknown target motion.Robust H∞filter based on acceleration non-zero mean value time-correlation model was adopted for state prediction and estimation for opto-electronic tracking targets.The prediction precision is nearly to be twice as much as that of Kalman filter.The experimental results show that the proposed method is proved to be effective in overcoming model change and stochastic measurement noises,and has high accuracy and good robustness..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 5 (2008)
Tracking Precision Analysis of Multi-Infrared-Sensor Measurement System
YANG Bai-sheng, and JI Hong-bing
In combination with the needs originated from the construction of measurement system based on multiple infrared sensors,the central fusion structure and Extended Kalman Filter (EKF) were selected.The Cramér-Rao Lower Bound (CRLB) of the algorithm was produced.The Geometrical Dilution Tracking Error (GDTE) was presIn combination with the needs originated from the construction of measurement system based on multiple infrared sensors,the central fusion structure and Extended Kalman Filter (EKF) were selected.The Cramér-Rao Lower Bound (CRLB) of the algorithm was produced.The Geometrical Dilution Tracking Error (GDTE) was presented to show the performance of the algorithm in the surveillance area.After analyzing the effects of the system parameters,the improved measures were brought forward..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 11 (2008)
Point Target Detection in Sea-Clutter SAR Image Based on Holder Exponent and ICA
LI Yu-tong, ZHOU Yue, and YANG Jie
A novel approach is proposed for point target detection in sea clutter Synthetic Aperture Radar (SAR) image.Firstly,pointwise Holder exponent of the original image is computed and proposed binary-fuzzy processing is applied on this Holder image for target enhancement,and then,the processed image data is used as input dA novel approach is proposed for point target detection in sea clutter Synthetic Aperture Radar (SAR) image.Firstly,pointwise Holder exponent of the original image is computed and proposed binary-fuzzy processing is applied on this Holder image for target enhancement,and then,the processed image data is used as input data to Independent Component Analysis (ICA).After convergence,based on the space separation theory we develop,original space of modified Holder image is separated into two subspaces called clean-space and noise-space consisting of respective independent components and corresponding basis images.Finally,the detection result is obtained with construction on the ‘clean’ subspace and clear extraction is obtained with simple morphological operation.As the results show,the proposed method is validated and point target is detected more efficiently compared with conventional methods..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 16 (2008)
Target Matching Algorithm Based on Region Main Color Feature
LIANG Guang-ming, SUN Ji-xiang, LI Zhong-tao, and TANG Yu-peng
The paper defined target region main color feature based on hue quantitative histogram in HSV color space.By integrating the average distance of region main color and the similarity of main color histogram,the distance formula of region color is acquired,and the sample color is determined by minimum color distance to rThe paper defined target region main color feature based on hue quantitative histogram in HSV color space.By integrating the average distance of region main color and the similarity of main color histogram,the distance formula of region color is acquired,and the sample color is determined by minimum color distance to region colors.Finally this algorithm can distinguish the difference of cell color in microscope color image effectively,and get good matching result..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 22 (2008)
Moving Target Detection Based on Adaptive Background Model
ZHA Cheng-dong, WANG Chang-song, GONG Xian-feng, and ZHOU Jia-xin
To solve the generation and update of background model in moving target detection,firstly,an approach to background generation based on modified K-means clustering algorithm was proposed in this paper.The concept of Dynamic Three-dimension Group (DTDG) was given and each pixel was modeled using three DTDGs.The approachTo solve the generation and update of background model in moving target detection,firstly,an approach to background generation based on modified K-means clustering algorithm was proposed in this paper.The concept of Dynamic Three-dimension Group (DTDG) was given and each pixel was modeled using three DTDGs.The approach got background extraction.Secondly,a novel approach of adaptive background model was presented.Any pixel was modeled by one new DTDG.Updating decisions were made according to the pixel dynamic change information.The approach can update the background to adapt slowness,sudden changes in illumination and moving background targets automatically.The experimental results demonstrate the effectiveness of the proposed approach..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 26 (2008)
Using Scintillation Modulation Approximation Theory to Investigate Phase Fluctuations of Waves Propagation Through the Turbulent Atmosphere
YANG Chang-qi, JIANG Wen-han, and RAO Chang-hui
When optical wave propagates through the turbulent atmosphere,it is well known that the theoretical results of phase fluctuations under the Rytov approximation are not in agreement with those in practice.In this paper,the authors proposed that the Andrews Modulation Approximation could be used to solve this problem.BasWhen optical wave propagates through the turbulent atmosphere,it is well known that the theoretical results of phase fluctuations under the Rytov approximation are not in agreement with those in practice.In this paper,the authors proposed that the Andrews Modulation Approximation could be used to solve this problem.Based on the principle of energy conservation,the scintillation modulation approximation theory was expressed in its explicit forms.Then by replacing the power spectrums of scintillation variances,the expressions of phase fluctuations of three links,uplink,downlink,and horizontal,were obtained.It is found out that the Andrews Modulation Approximation has many different forms,and for each form,its parameters have different physical meanings.In comparison with the results under the Rytov approximation,the results by this method in this paper are suitable for the situations,such as slant propagation,and scintillation convergence and saturation..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 31 (2008)
Design of Laser Imaging Radar for Air Detection
ZHANG Ying-yuan, LIU Jin-song, and LI Dong-yuan
Several imaging techniques for the imaging laser radar are outlined.The composition of laser imaging radar for air detection with linear array Avalanche Photodiode (APD) and scanning mirror is introduced.The design principle of laser transmitter,receiver and signal processing components of laser radar is shown.A prototSeveral imaging techniques for the imaging laser radar are outlined.The composition of laser imaging radar for air detection with linear array Avalanche Photodiode (APD) and scanning mirror is introduced.The design principle of laser transmitter,receiver and signal processing components of laser radar is shown.A prototype system is designed,which has an operating wavelength of 1.064μm,a vibration mirror of 1D,and a linear array APD of 32 pixels.The relation between the parameters is also considered adequately..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 36 (2008)
Application of Extended Fourier Diffraction Theory for Alternating Phase Shift Mask
LIU Jia, and ZHANG Xiao-ping
In order to improve the resolution of photolithographic system,hyper numerical aperture is needed.However,analysis of transfer function with Fourier diffraction theory will be inadequate,and shadowing effects must be considered for oblique illumination.Therefore,a new approximation model for alternating phase shift masIn order to improve the resolution of photolithographic system,hyper numerical aperture is needed.However,analysis of transfer function with Fourier diffraction theory will be inadequate,and shadowing effects must be considered for oblique illumination.Therefore,a new approximation model for alternating phase shift mask considering shadowing effects was proposed in this paper,and shadowing ratio was redefined.Extended Fourier diffraction theory was used,and a relation of function depended on incident angle.Expressions for alternating phase shift mask were given for both space domain and frequency domain.Diffraction efficiencies and interference fields were simulated using approximation model.The results show that diffraction efficiencies and interference fields vary with incident angles and diffraction efficiencies vary with linewidth too.Moreover,diffraction efficiencies are symmetric about the zero incident angle..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 40 (2008)
Algorithm for Gray Face Tracking Based on Mean Shift
ZHANG Xu-guang, ZHANG Ye, and WANG Yan-jie
In gray-level image sequence,due to the sensitivity to illumination and the lack of the information for the object representation,the face tracking based on the mean shift algorithm may be unstable.In order to apply mean shift algorithm in gray-level image effectively,a strategy which integrates intensity and orientatiIn gray-level image sequence,due to the sensitivity to illumination and the lack of the information for the object representation,the face tracking based on the mean shift algorithm may be unstable.In order to apply mean shift algorithm in gray-level image effectively,a strategy which integrates intensity and orientation codes to represent target is adopted.A new algorithm is presented for face tracking in this paper.Experiment results show that the new algorithm can successfully cope with clutter,partial occlusions,illumination change and target variations such as scale and rotation.The computational complexity is greatly reduced.If the size of the target is 48×68 pixels,the computation time of the whole algorithm is about 34ms..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 45 (2008)
Application of Wavelet Packet Transform for Illumination Compensation in Face Recognition
NIE Xiang-fei, TAN Ze-fu, and GUO Jun
A novel illumination compensation algorithm for face recognition under non-uniform illumination conditions was presented.Firstly,the face images were transformed from spatial domain to logarithm domain,and the 2-dimensional wavelet packet transform was calculated.Secondly,coefficients of some sub-band images were discaA novel illumination compensation algorithm for face recognition under non-uniform illumination conditions was presented.Firstly,the face images were transformed from spatial domain to logarithm domain,and the 2-dimensional wavelet packet transform was calculated.Secondly,coefficients of some sub-band images were discarded for face illumination compensation in logarithm domain.The effect of face illumination compensation was denoted by face recognition rate because the intention of illumination compensation was to improve the performance of face recognition.The proposed approach was compared with the Discrete Cosine Transform (DCT) method in logarithm domain on Yale B face database.The experimental results show that the average error rate of the proposed approach can reach 0.53%,which is superior to the DCT method for face illumination compensation in logarithm domain..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 50 (2008)
Wide-range Grating Interferometer with Nanometer Resolution
CHU Xing-chun, LV Hai-bao, and ZHAO Shang-hong
Since both the measuring range and the resolution of a traditional grating interferometer were difficult to be improved simultaneously,a grating interferometry based on a single long metrology grating was presented.Firstly,an interferogram was generated by interference between the ±5 orders beams diffracted by theSince both the measuring range and the resolution of a traditional grating interferometer were difficult to be improved simultaneously,a grating interferometry based on a single long metrology grating was presented.Firstly,an interferogram was generated by interference between the ±5 orders beams diffracted by the grating.The length of the grating was 400mm and its pitch was 10μm.The optical fringe multiplication achieved was 10.Then,a fringes subdividing method based on the time-shift property of Fast Fourier Transform (FFT) algorithm was developed.By calculating the phase change of the fringes at a certain position between two sequential acquisition interferogram,the fringes were subdivided electronically and the subdividing multiple was as high as 1000.During this course,the effect of energy leakage on the phase-extraction precision of FFT was suppressed by tailoring the acquisition interferogram into a few full-multiples of the fringes.The resulting subdividing precision could reach at least 1/1000 period of the fringes.Simulation and experimental results show the system resolution is 1nm and measurement precision is less than 10nm..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 55 (2008)
Novel Field Calibration Through Rotation in Six-position for FOG-IMU
LIU Bai-qi, and FANG Jian-cheng
To improve the accuracy of Strapdown Inertial Navigation System (SINS) based on fiber optic gyro (FOG),the errors of Inertial Measurement Unit (IMU) must be calibrated in laboratory through precise turntable and compensated in SINS.However,the error coefficients of IMU are not stable and vary with time slowly,which degTo improve the accuracy of Strapdown Inertial Navigation System (SINS) based on fiber optic gyro (FOG),the errors of Inertial Measurement Unit (IMU) must be calibrated in laboratory through precise turntable and compensated in SINS.However,the error coefficients of IMU are not stable and vary with time slowly,which degrades the SINS severely in application.To solve the problem,a novel field calibration method is proposed in this paper.The FOG-IMU was rotated 12 times in six-position,and 48 non-linear equations were established according to the error model of FOG-IMU.The non-linear components in these equations were eliminated through the FOG-IMU rotation and the symmetrical position.Therefore,these non-linear equations were transferred to linear equations.Then the error coefficients were calculated by solving these linear equations.Finally,the experiment was carried out,and the experiment results indicate that the novel calibration method can accurately determine 15 error coefficients of FOG-IMU,and the accuracy of this method is equivalent to the classical calibration with the precise turntable..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 60 (2008)
Realization of Field BRDF Acquisition by Multiangular Measurement System
LI Xin, ZHENG Xiao-bing, XUN Li-na, LIU Jing-jing, and RONG Zhi-guo
In order to acquire field Bidirectional Reflectance Distribution Function (BRDF) of targets,a multiangular measurement system was designed.The system includes an automated goniometer and two ASD FieldSpec spectroradiometers with spectral resolution of 3nm.One ASD spectroradiometer was placed on the platform of goniometIn order to acquire field Bidirectional Reflectance Distribution Function (BRDF) of targets,a multiangular measurement system was designed.The system includes an automated goniometer and two ASD FieldSpec spectroradiometers with spectral resolution of 3nm.One ASD spectroradiometer was placed on the platform of goniometer measured reflectance of target,meanwhile,the other placed on the ground acquired reflectance of reference panel.We measured the BRDF of meadow by use of this system.A hemispherical measurement (66 positions) was done in about 10 minutes and the principal plane measurement (interval 5°,31 positions) was carried out in about 2.5 minutes.The measurement results show the non-Lambertian characters of the target,which exposes obvious directional reflectance in principal plane with strong back-scattering and a less developed forward scattering..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 66 (2008)
Linear Self-calibration Method for Camera
FU Dan, FENG Wei-dong, YU Qi-fen, and XU Yi-dan
A novel linear approach using space-coplanar-line to perform camera self-calibration from a single image is presented.Combined with engineering applications,the method directly utilizes rectangular information of the scene and the centrical projection relation of the point to obtain the projection relation of the linesA novel linear approach using space-coplanar-line to perform camera self-calibration from a single image is presented.Combined with engineering applications,the method directly utilizes rectangular information of the scene and the centrical projection relation of the point to obtain the projection relation of the lines.The linear internal and external parameters of high precision calibration of the camera are derived based on three unparallel coplanar lines.The results of synthetic and real images are accurate and reliable with this method,whose precision is obviously better than that with the space-coplanar-point method..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 71 (2008)
Measurement of the Quadratic Electro-optic Coefficient of Organic Polymer Based on Attenuated-total-reflection Technique
ZHU Kun, DENG Xiao-xu, CAO Zhuang-qi, SHENG Qi-shun... and XIE Shi-xiang|Show fewer author(s)
The Quadratic Electro-optic (QEO) coefficient is a very important parameter in the evaluation of the QEO effect of the organic polymer,which could be expressed as a 6×6 tensor.By the utilization of the symmetric characteristic of the tensor,algebra relation between the elements in the tensor and refraction index eThe Quadratic Electro-optic (QEO) coefficient is a very important parameter in the evaluation of the QEO effect of the organic polymer,which could be expressed as a 6×6 tensor.By the utilization of the symmetric characteristic of the tensor,algebra relation between the elements in the tensor and refraction index ellipsoid equation,an approach base on Attenuated-total-reflection (ATR) technology was proposed for the measurement of the QEO coefficient of the organic polymer.In the measurement,elements S11and S12in the tensor could be obtained by choosing TM mode and TE mode respectively as the polarization mode of the incident light beam.Then,S44and DC Kerr Coefficient could be calculated using the known algebra relation equation.Consequently,the value of all elements in the QEO coefficient tensor is obtained..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 76 (2008)
Moving Shadow Detection Approach Based on Texture
ZHANG Ling, CHENG Yi-min, GE Shi-ming, and LI Jie
To prevent moving shadow from being misunderstood as part of moving objects in video target segmentation,a novel approach is proposed for the shadow detection.Firstly,video target segmentation was achieved through background subtraction based on adaptive Gaussian mixture models.Then,based on the observation that shadowTo prevent moving shadow from being misunderstood as part of moving objects in video target segmentation,a novel approach is proposed for the shadow detection.Firstly,video target segmentation was achieved through background subtraction based on adaptive Gaussian mixture models.Then,based on the observation that shadow regions present similar textural characteristics in each frame of the gray-level video-sequence and in the corresponding adaptive background model,the shadow was detected based on the similarity of texture represented by histogram of "uniform" patterns of Local Binary Patterns(LBP) between shadow region and corresponding region in the background.The approach requires only a small number of parameters,and experiments on variety real-world video data demonstrate the favorable performance and robustness of the proposed scheme.It can be applied to moving target segmentation,detection and etc..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 80 (2008)
Inverse Heat Conduction Problem of Inherent Defect Based on the Levenberg-Marquardt Method
WANG Yan-wu, YANG Li, and SUN Feng-rui
A three-dimensional physical and mathematical heat transfer model was built based on the heat transfer theory and the modified Levenberg-Marquardt method.An inverse heat conduction problem was studied based on the modified model.And the computational results show that the new model converges better than the old one.TheA three-dimensional physical and mathematical heat transfer model was built based on the heat transfer theory and the modified Levenberg-Marquardt method.An inverse heat conduction problem was studied based on the modified model.And the computational results show that the new model converges better than the old one.The effects of position,size and the thermal conductance of the defect on the computational results were analyzed according to the different defect.And the results show that the modified model is more suitable to calculate the position,size of the defect and the thermal conductance of the defect respectively than together.And the results are affected by the temperature measurement errors,especially the thermal conductance of defect..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 85 (2008)
Volume Rendering Acceleration Technology of Medical Images Based on the Ray Casting
TAO Ling, QIAN Zhi-yu, and CHEN Chun-xiao
Aiming at the tremendous computation and the low rate of standard ray casting algorithm,a new speed-up algorithm of ray casting volume rendering was presented to realize the real-time manipulation of medical images.Firstly,with the uniform changes characteristics of primitives before and after matrix transformation,allAiming at the tremendous computation and the low rate of standard ray casting algorithm,a new speed-up algorithm of ray casting volume rendering was presented to realize the real-time manipulation of medical images.Firstly,with the uniform changes characteristics of primitives before and after matrix transformation,all re-sampling points except for the six vertex were deduced so as to reduce matrix computation greatly.Secondly,the boundary box technique was utilized to avoid the sampling in empty voxel.Thirdly,extending the Bresenham algorithm to three-dimension,casting ray voxelizing and the re-sampling parameters were computed simultaneously,which greatly improved the efficiency of ray casting.All results of a mass of contrasting experiments show that the acceleration algorithm can produce the same quality images as the conventional standard algorithm ,but the velocity of volume rendering is increased by two or three times..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 89 (2008)
Wavelet Packet Compression Algorithm for Remote Sensing Images with Extended Spatial Orientation Tree
MI De-ling, FENG Peng, WEI Biao, PAN Ying-jun, and JIN Wei
For remote sensing images,ordinary image compression algorithm always loses crucial features,such as edges and texture,during the coding procedure.A new compression scheme is proposed based on wavelet packet which has good performance on image detail processing.The problems arising from the application of zero tree-basFor remote sensing images,ordinary image compression algorithm always loses crucial features,such as edges and texture,during the coding procedure.A new compression scheme is proposed based on wavelet packet which has good performance on image detail processing.The problems arising from the application of zero tree-based algorithm to wavelet packet transform are analyzed.A generation version of parent-children relationship,named Extend Spatial Orientation Tree (SOT),to solve the parental conflict is defined.Combined with SPIHT,Extended SOT Wavelet Packet Codec (ESOT-WPC) is realized.Experimental results show that,under the same compression rate,the new codec method outperforms SPIHT in terms of Peak Signal-to-noise Ratio (PSNR) and vision..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 94 (2008)
Method of Corner Matching Used in Image Registration
LIU Yu-ran, ZHANG Yu-dong, RAO Xue-jun, and HOU Ming-liang
Considering the difficulty of the registration of two images of the eye-ground gotten by adaptive optics principles,a new corner matching method was proposed,which was based on corners detection in the OpenCV environment.This method applied the invariability of the distance and slope of two image’s corner couples in a Considering the difficulty of the registration of two images of the eye-ground gotten by adaptive optics principles,a new corner matching method was proposed,which was based on corners detection in the OpenCV environment.This method applied the invariability of the distance and slope of two image’s corner couples in a small area of the eye-ground to filtrate out three couples of corners which were parallelism in two images.The result shows that three corner couples are found rapidly and exactly by this method,so the corner detection and the corner matching of two images in the eye-ground are solved..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 100 (2008)
Enhancement of Panoramic Image Resolution Based on Swift Interpolation of Bezier Surface
XIAO Xiao, YANG Guo-guang, and BAI Jian
Panoramic Annular Lens (PAL) project the view of the entire 360 degrees around the optical axis onto an annular plane based on the method of flat cylinder projection.Due to the infinite depth of field and the linear mapped relationship between an object and an image,panoramic imaging system plays important roles in thePanoramic Annular Lens (PAL) project the view of the entire 360 degrees around the optical axis onto an annular plane based on the method of flat cylinder projection.Due to the infinite depth of field and the linear mapped relationship between an object and an image,panoramic imaging system plays important roles in the applications of robot vision,surveillance and virtual reality.An annular image needs unwrapping to conventional rectangular image without distortion,in which interpolation is necessary.Although cubic B-splines interpolation can enhance the resolution of unwrapped image,it occupies too much time to be applied in practice.Considering the characteristic of panoramic image,a swift interpolation algorithm based on Bezier surface is proposed.Compared with cubic B-splines and bilinear interpolation image,the result indicates that the resolution of the image is well enhanced.Meanwhile,the time consumed is shortened by 80% in comparison with cubic interpolation..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 105 (2008)
Data Fusion Filtering Techniques Based on Multiscale Kalman Filter
WANG Peng-wei, WU Xiu-qing, and SUN Fu-ming
In this paper,with analysis on the dynamic system model based on wavelet transform,a novel data fusion filtering algorithm based on multiscale Kalman filter was proposed.Wavelet transform was very suitable for processing multiscale signals,and it could be used in multiresolution fusion filtering.The approach used the mIn this paper,with analysis on the dynamic system model based on wavelet transform,a novel data fusion filtering algorithm based on multiscale Kalman filter was proposed.Wavelet transform was very suitable for processing multiscale signals,and it could be used in multiresolution fusion filtering.The approach used the multi-scale characteristic of wavelet transform to decompose the primal forecasting sequence firstly,and performed Kalman filtering estimate on each level,and lastly wavelet reconstruction was applied to integrate the estimate information from neighborhood scale.So the better filtering precision is obtained.The wavelet decomposition of the noised measurements was combined with Kalman filter in every scale and it makes the best of multiresolution data information.Thus,the better filtering results are achieved for the dynamic system with high-level noise in practice..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 110 (2008)
Estimating the Fundamental Matrix Based on Serial Information of Coronary Artery Angiograms
WANG Guo-dong, SANG Nong, and ZHANG Zhen
Since the images vary much with different view points in the 3D reconstruction of coronary artery,it is impossible to get matching points using traditional methods.Therefore,we only manually got bifurcate points as characteristic points,and the number of points was few,thus the estimation of fundamental matrix was diffSince the images vary much with different view points in the 3D reconstruction of coronary artery,it is impossible to get matching points using traditional methods.Therefore,we only manually got bifurcate points as characteristic points,and the number of points was few,thus the estimation of fundamental matrix was difficult.To overcome this problem,a method was introduced to enhance the geometrical accuracy from two noncalibrated serial two-dimensional angiographic projections.Using serial coronary artery angiograms,we could get many matching points.Thus we could calculate the epipolar geometry using Random Sample Consensus Paradigm (RANSAC) which was often used in the reconstruction of nature scene.The results show that the method proposed is accurate and robust for estimating the fundamental matrix in angiograms..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 116 (2008)
Method for Video Quality Evaluation Based on HVS Properties
YUAN Fei, HUANG Lian-fen, and YAO Yan
A method for the objective video quality assessment is proposed.By using the Human Vision System (HVS) properties into the intra and inter frame processing,the proposed method can overcome the traditional Peak Signal-to-noise Ratio (PSNR) in the application of video quality evaluation.Based on the principle that human&A method for the objective video quality assessment is proposed.By using the Human Vision System (HVS) properties into the intra and inter frame processing,the proposed method can overcome the traditional Peak Signal-to-noise Ratio (PSNR) in the application of video quality evaluation.Based on the principle that human's eyes tend to be more sensible to the degradation happening in the edge of image,a detection scheme is designed to evaluate the distortion in the intra frame.By measuring the temporal energy,know the typical features in the temporal domain and then use them to modify the evaluation result of the spatial domain.The proposed method inherits the advantages of the traditional PSNR such as simpleness and convenience and has better correlation with the subjective perception.And it can be easily implemented and integrated in the equipment system of detection..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 120 (2008)
New Image Fusion Algorithm Based on PCNN
YU Rui-xing, ZHU Bing, and ZHANG Ke
A novel algorithm based on Pulse Coupled Neural Network (PCNN) for image fusion was proposed.First,the two original images were decomposed by stationary wavelet transform,meanwhile,the two group multiscale sequences of each input images could be obtained.Secondly,one of the multiscale sequences were chosen arbitrarily A novel algorithm based on Pulse Coupled Neural Network (PCNN) for image fusion was proposed.First,the two original images were decomposed by stationary wavelet transform,meanwhile,the two group multiscale sequences of each input images could be obtained.Secondly,one of the multiscale sequences were chosen arbitrarily as the input to the main PCNN network,and the others as the input to the subsidiary network.Then,sequences of multiscale fusion images were gotten by the parallel PCNN and the fused image could be obtained by inverse stationary wavelet transform at each process of iteration.At last,the optimal fusion result is obtained when the maximum value of the information entropy is achieved.Lots of experiments and comparisons with other fusion algorithms show the effectiveness and superiority of new method..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 126 (2008)
Improved Nonuniformity Correction Algorithm Based on Kalman-filtering
JIAN Yao-bo, RUAN Shuang-chen, ZHOU Hui-xin, and LIU Chun-ping
Referring to the effect of the nonlinear response of detectors in Infrared Focal Plane Arrays (IRFPA) on the nonuniformity correction accuracy,an improved nonuniformity correction algorithm is presented based on Kalman-Filtering.The piecewise linear model of detector response is adopted in the algorithm.By use of the mReferring to the effect of the nonlinear response of detectors in Infrared Focal Plane Arrays (IRFPA) on the nonuniformity correction accuracy,an improved nonuniformity correction algorithm is presented based on Kalman-Filtering.The piecewise linear model of detector response is adopted in the algorithm.By use of the model,the nonuniformity correction algorithm based on Kalman Filter is extended and improved.The effect of the nonlinear response of detector on the nonuniformity correction accuracy is eliminated with this algorithm.Experimental result indicates that the improved algorithm acquires good effect of the nonuniformity correction.It can resolve the problems of detector bias and gain drift with time,as well as the influence of the detector nonlinear response on the nonuniformity correction performance in some degree..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 131 (2008)
Remote Sensing Image Segmentation Based on Local Fractal Dimension
CHEN Xiao-mei, and NI Guo-qiang
According to the fractal characters of remote sensing image,the image was segmented with the Local Fractal Dimension (LFD).The pyramid model instead of local window model was used to decrease the computation time in computing local triangular prism.Compared with traditional method,a new recursive procedure was designedAccording to the fractal characters of remote sensing image,the image was segmented with the Local Fractal Dimension (LFD).The pyramid model instead of local window model was used to decrease the computation time in computing local triangular prism.Compared with traditional method,a new recursive procedure was designed to decrease the needed memory capacity.The experiment results on remote sensing image segmentation show that the improved method effectively increases the speed of image segmentation based on the texture,and keeps the accurateness of the fractal dimension with the triangular prism method..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 136 (2008)
Lossy Compression Algorithm of Multispectral Remote Sensing Images Based on IHS Transform
TIAN Bao-feng, SUN Rong-chun, WANG Hai-xia, and XU Shu-yan
An effective and lossy compression algorithm of multispectral remote sensing images was proposed.On the basis of analyzing characteristic of multispectral images,IHS transform and integer wavelet transform were combined to compress data.IHS transform approach was applied to remove the correlation between spectral bandsAn effective and lossy compression algorithm of multispectral remote sensing images was proposed.On the basis of analyzing characteristic of multispectral images,IHS transform and integer wavelet transform were combined to compress data.IHS transform approach was applied to remove the correlation between spectral bands and integer wavelet transform was applied to remove the correlation of spatial.According to the important degree of the each subband,adaptive threshold values were chosen in the quantification,and fixed bit-plane coding and RLE were individually used to quantify data of every subband and important graph.The experiment result shows that the algorithm has higher compression ratio while PSNR≥33dB.In addition,the algorithm requires small storage and is easy to be realized in hardware..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 35, Issue 1, 140 (2008)
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