Journals >Opto-Electronic Engineering
Contents
2009
Volume: 36 Issue 10
28 Article(s)
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Research Article
A Novel Method for Moving Object Extraction with an Active Camera
XIANG Gui-shan
How to extract moving object in the case of moving camera is researched in this paper. At first, the background subtraction is implemented to detect the moving region in the case of motionless camera, and then the interested moving object is fast segmented from the detected moving region with the proposed method of barHow to extract moving object in the case of moving camera is researched in this paper. At first, the background subtraction is implemented to detect the moving region in the case of motionless camera, and then the interested moving object is fast segmented from the detected moving region with the proposed method of barycenter shift iteration instead of the time-consuming method of connected components analysis. In the enhanced Camshift tracking algorithm, the Color Probability Density Distribution Image (CPDDI) in the Region of Interest (ROI) predicted by the Kalman filter is obtained, and Instantaneous Background (IB) is introduced to suppress background features. A novel method is suggested to extract the moving object from the tracking result combining CPDDI with proper morphologic filter strategy in the case of moving camera, which can resist the disturbance from the background. Experiments show that the proposed method can extract intact moving objects stably in the case of moving camera, and can well deal with dynamic complex background. The system is computationally efficient and can run in real-time speed..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 1 (2009)
High Speed Small Target Detection Based on Improved Particle Swarm Optimization
LIU Yun-long, LIN Bao-jun, and AI Yong
An algorithm for small target detection with high speed was proposed. For optimization of algorithm, Particle Swarm Optimization (PSO) was utilized. In order to overcome some defects with PSO, a method about adaptive adjustment of swarm topology was developed, which improved the particles swarm diversity and strengthenAn algorithm for small target detection with high speed was proposed. For optimization of algorithm, Particle Swarm Optimization (PSO) was utilized. In order to overcome some defects with PSO, a method about adaptive adjustment of swarm topology was developed, which improved the particles swarm diversity and strengthened their searching capabilities. For small target detection, the local variance increment can depict small target which acts as a sudden change with grayscale in local pixel space. PSO was combined with detection for decreasing the computation cost. Simulation shows that the improved PSO gets excellent search ability which accelerates detection, and the detection result is reliable and effective..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 6 (2009)
Geometrical Feature Point-based Tracking Algorithm for Extended Target
FAN Zhi-hua, WANG Chun-hong, and WU Ming-jun
A geometrical feature point-based approach for tracking a certain region of the extended target is presented. In this approach, the geometrical feature point is used as the template for tracking, which is similar to template matching. Combining the multi-scale Harris detector with Scale Invariant Feature Transform (SIFA geometrical feature point-based approach for tracking a certain region of the extended target is presented. In this approach, the geometrical feature point is used as the template for tracking, which is similar to template matching. Combining the multi-scale Harris detector with Scale Invariant Feature Transform (SIFT) descriptor, these feature pionts can be detected and described. A new weighted similarity measure and updating strategy is adapted in order to improve the accuracy of point matching. Test results show that the proposed algorithm can track the extended target accurately and robustly even though the pose of the target changes significantly between frames..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 12 (2009)
A Distributed Multi-view Object Tracking Algorithm Based on Maximum Likelihood Criterion
FENG Wei, YANG Cheng, HU Bo, and FENG Hui
A novel algorithm is proposed to perform object tracking with multiple cameras in a distributed computing manner. Firstly, the maximum likelihood criterion is employed to model the multi-view tracking problem. Then, the likelihood function is factorized based on the conditional independent assumptions. Finally, the estA novel algorithm is proposed to perform object tracking with multiple cameras in a distributed computing manner. Firstly, the maximum likelihood criterion is employed to model the multi-view tracking problem. Then, the likelihood function is factorized based on the conditional independent assumptions. Finally, the estimation of the target location in each camera view is obtained by using an efficient message passing mechanism. In our algorithm, image data from all cameras no longer need to be transmitted to and processed by a central unit. Meanwhile, by taking full advantage of image data from multiple cameras, the tracking algorithm is very robust to occlusion. Both qualitative and quantitative experiments have demonstrated the effectiveness of the proposed algorithm..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 16 (2009)
Phase-encoded Joint Transform Correlation Pattern Recognition Based on SONG Correlation
WU Dan, LU Yuan, LING Yong-shun, and MA Chao-jie
In order to get good general performance of optical joint transform correlation pattern recognition, a new reference shifted phase-encoded fringe-adjusted joint transform correlator for distortion invariant pattern recognition is proposed based on Sliced Orthogonal Nonlinear Generalized (SONG) correlation. The new corrIn order to get good general performance of optical joint transform correlation pattern recognition, a new reference shifted phase-encoded fringe-adjusted joint transform correlator for distortion invariant pattern recognition is proposed based on Sliced Orthogonal Nonlinear Generalized (SONG) correlation. The new correlator not only enhances the performance of resisting disturbance signal and noise, but also has a good performance of multiple target recognition by introducing the technique of SONG correlation and Synthetic Discriminant Function (SDF). It realizes distortion invariant pattern recognition by modifying the constraint condition of SDF when several distorted targets occur in the input image. The results of simulation indicate that correlation peak value and peak-to-noise ratio of output is 1.87~5.16 times and 1.88~5.19 times of those without introduction of SONG correlation respectively during whole noise density intervals when input image is destroyed by nonoverlapping background noise. And average deviation is less than 0.04. Preferable correlation peak value and peak-to-noise ratio of output can be obtained during most of noise density intervals when input image is destroyed by substitutive noise, and average deviation is less than 0.1 when noise density is not more than 0.4..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 24 (2009)
Fabrication of High Aspect-ratio Hard X-Ray Zone Plates with Supporting Structures
MA Jie, CAO Lei-feng, XIE Chang-qing, WU Xuan, LI Hai-liang, ZHU Xiao-li, LIU Ming, CHEN Bao-qin, and YE Tian-chun
The design and fabrication of high aspect-ratio hard X-ray zone plates by X-ray lithography are studied. The X-ray lithography mask was fabricated by electron beam lithography, and the final hard X-ray zone plates were fabricated by X-ray lithography. By integrating supporting points into the photoresist structure, theThe design and fabrication of high aspect-ratio hard X-ray zone plates by X-ray lithography are studied. The X-ray lithography mask was fabricated by electron beam lithography, and the final hard X-ray zone plates were fabricated by X-ray lithography. By integrating supporting points into the photoresist structure, the high aspect ratio of hard X-ray zone plates fabricated by X-ray lithography was greatly increased. The arrangement strategy of added supporting points was optimized to reduce the area ratio taken by the supporting points. High quality zone plates were achieved with an outermost zone width of 200 nm and a thickness of 2.8 μm. The fabricated zone plates can be used for 10 to 25 keV hard X-rays, and imaging resolution better than 250 nm can be expected..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 30 (2009)
Model of Drift-scan CCD’s Rotation Control
MA De-bao, LIN Jian-lin, and CHEN Dong
CCD drift-scan technique can improve the survey efficiency of ground-based optoelectronic telescope system and the data precision of space targets. But, it is not suitable to survey the fast moving targets at present. Combinning with a rotated device of exactitude control is one of ways to spread the application of CCDCCD drift-scan technique can improve the survey efficiency of ground-based optoelectronic telescope system and the data precision of space targets. But, it is not suitable to survey the fast moving targets at present. Combinning with a rotated device of exactitude control is one of ways to spread the application of CCD drift-scan technique. The square CCD plane array was taken as template, and the model of drift-scan CCD’s rotation control was founded based on the study of CCD drift-scan technique. Then, the model was used to do the simulation experiment of observation. Furthermore, the imaging effect of different model parameters including revolving angle and pulse control period on survey was analyzed. By validating the above analyses through experiments, the rotation-control model proposed is showed to be available, and the relative results can be used as references for real survey..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 35 (2009)
Focusing Technique for Three-line Stereo Mapping Camera and Realization
LI Zhao-hui, WANG Zhi, QIAO Ke, and ZHANG Li-ping
For focusing mechanism of three-line stereo mapping CCD camera, the special techniques are required to ensure imaging in focus and keep the position accuracy of the inner orientation elements unchangeably. In order to implement refocusing the camera in-orbit, focusing mechanism must have high position precision and movFor focusing mechanism of three-line stereo mapping CCD camera, the special techniques are required to ensure imaging in focus and keep the position accuracy of the inner orientation elements unchangeably. In order to implement refocusing the camera in-orbit, focusing mechanism must have high position precision and movement accuracy. Two principles of adjustment mechanism are presented. One is drove by screw, guided by two rails;the other adopted the tube cam mechanism to transfer the cam’s rotation into the CCD’s movement along optical axis. The whole focusing system of cam focusing method is realized in compact volume and high stability. Experiment results indicate that focusing precision is less than ±11μm, rotation error less than 5″, and linearity error less than 8″..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 41 (2009)
Dynamic Misalignment Detecting Technology in Space-borne Fourier Transform Spectrometer
WEI Huan-dong, HUA Jian-wen, DAI Zuo-xiao, CHEN Ren, and LI Da-yu
Dynamic Alignment System (DAS) is one of the key technologies in space-borne Fourier transform spectrometer. The misalignment angle detecting is a key step of DAS. The working environment of space-borne Fourier transform spectrometer requires high precision and large scale angle detection. An algorithm is presented basDynamic Alignment System (DAS) is one of the key technologies in space-borne Fourier transform spectrometer. The misalignment angle detecting is a key step of DAS. The working environment of space-borne Fourier transform spectrometer requires high precision and large scale angle detection. An algorithm is presented based on instantaneous laser power detecting, which meets the requirements of the high precision and the large scale well. Furthermore, the key steps and experiment results are introduced. Experimental results show that this method is able to achieve the precision of 0.03 rad and angle scale exceeding ±π,which offers a guarantee to space-borne Fourier transform spectrometer to receive high-quality interferograms of the infrared radiation from the earth and the atmosphere..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 47 (2009)
Computational Method of Flyer Plates Kinetic Energy Efficiency Based on Laser Driving
ZHAO Xiang, SU Wei, LI Dong-jie, and GAO Yang
With regard to decreasing the volume and weight of laser ignition system, it is practically significant to realize system miniaturization by utilizing efficiently kinetic energy of flyer plate. According to Laser Supported Detonation Wave (LSDW) theory, the time and space distributions of detonation-wave pressure of flWith regard to decreasing the volume and weight of laser ignition system, it is practically significant to realize system miniaturization by utilizing efficiently kinetic energy of flyer plate. According to Laser Supported Detonation Wave (LSDW) theory, the time and space distributions of detonation-wave pressure of flyer plates supported by laser are analyzed. Then flyer plates kinetic energy efficient equation is deduced. Finally, Taking aluminium flyer plates as an example, the influences of the laser parameters (such as power density, pulse width, and focus spot diameter) and flyer structure parameters (such as flyer thickness, diameter) on kinetic energy efficient are analyzed. The computational results show that flyer plates kinetic energy efficiency has direct ratio to laser pulse width and flyer plates diameter, whereas has inverse ratio to focus spot, power density and flyer plates thickness..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 51 (2009)
An Auto-alignment and Stabilization Cavity Laser System by Use of an Intracavity Concave Mirror
LI Xiao-jie, and LI Wen-yu
To improve the output laser beam quality of a positive-branch confocal unstable resonator, an auto-alignment and stabilization cavity laser system is presented. The tilt aberration measured by a Hartmann-Shack (H-S) sensor is taken as the feedback parameter, and a step-motor is used to control the concave cavity mirrorTo improve the output laser beam quality of a positive-branch confocal unstable resonator, an auto-alignment and stabilization cavity laser system is presented. The tilt aberration measured by a Hartmann-Shack (H-S) sensor is taken as the feedback parameter, and a step-motor is used to control the concave cavity mirror, and a classic PID algorithm is adopted to compensate for the tilt aberration and stabilize the output laser beam. Theoretical and experimental results proved that this system can correct the tilt aberration in real time and the output laser beam becomes stable when the aberration is moved out..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 56 (2009)
Influence of Self-mixing Effect of a Diode Laser on Continuous-wave Cavity Ring-down Technique
ZHAO Tong-kai, QU Zhe-chao, and HAN Yan-ling
By employing a continuous-wave broadband diode laser, a Self-mixing Cavity Ring-down (SM-CRD) technique is investigated for accurate reflectivity measurement of optical mirrors at 1064nm. The self-mixing effect is induced from the optical feedback, directly reflected from the Ring-down Cavity (RDC), is re-injected intoBy employing a continuous-wave broadband diode laser, a Self-mixing Cavity Ring-down (SM-CRD) technique is investigated for accurate reflectivity measurement of optical mirrors at 1064nm. The self-mixing effect is induced from the optical feedback, directly reflected from the Ring-down Cavity (RDC), is re-injected into the oscillator cavity of the diode laser. The influence of the self-mixing effect on both output power and spectrum of the diode laser is presented. The coupling efficiency of the laser power into the RDC is greatly enhanced by the self-mixing effect. In the SM-CRD experimental setup, the high reflectivity of the cavity mirrors is measured to be 99.914% and the measurement accuracy is at the 10-5 level. The experimental results demonstrate that the SM-CRD technique is a very simple, inexpensive, precise and stable for high reflectivity measurement..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 60 (2009)
PolSAR Image Classification by Polarization Decomposition Associated with Subaperture Analysis
WANG Hai-jiang, and PI Yi-ming
A PolSAR image classification method which combines traditional polarization decomposition and subaperture analysis is proposed. Firstly, a full resolution PolSAR image is decomposed into several subapertures and two kinds of nonstationary targets are detected. Then, eigenvalue decomposition is done on the coherency maA PolSAR image classification method which combines traditional polarization decomposition and subaperture analysis is proposed. Firstly, a full resolution PolSAR image is decomposed into several subapertures and two kinds of nonstationary targets are detected. Then, eigenvalue decomposition is done on the coherency matrices of full resolution SAR images. The two parameters, entropy H and angle α are obtained. With these two parameters, targets can be classified based on H-α plane. Finally, combining the nonstationary detection results and the H-α classification results, the classification with higher fineness is done. Simulation results show that better classification effects are obtained with the proposed method..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 65 (2009)
Velocity Measurement Based on Partial Motion Blur Image
XU Yuan-nan, ZHAO Yuan, LIU Li-ping, and SUN Xiu-dong
For the partial motion blur caused by motion object in static background, the corresponding relationship among the object velocity, motion blur length, object range and camera parameter such as exposure time is built. A novel algorithm of parameter identification for partial motion blur is proposed. The information of For the partial motion blur caused by motion object in static background, the corresponding relationship among the object velocity, motion blur length, object range and camera parameter such as exposure time is built. A novel algorithm of parameter identification for partial motion blur is proposed. The information of target motion direction is given by Fourier spectrum and Radon transformation, and then the motion direction is adjusted to horizontal direction. Through the image segmentation and binarization, edge detection using the reconstructive Prewitt operator and self-correlation each row in the region of edge image corresponding to the binary image, the motion blur length is given by the statistical information. Moreover, the object velocity is measured. The experimental results show that our method is effective even though the object shape is complex. Between the estimated object velocity and the real average velocity, the experiment errors are all less than 7%. In addition, our method is propitious to auto completion, and has a good real-time performance..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 71 (2009)
Rock Fracture Edge Detection Based on Quaternion Convolution Using Average Weighting
XU Jiang-yan, and WANG Wei-xing
Rock fractures have a strong impact on the radionuclide transport and retention. We sampled a number of rock specimens and then acquired the rock fracture images. The quaternion convolution can be used to detect the rock fracture edges. In this paper, a simplified quaternion convolution algorithm is presented and a setRock fractures have a strong impact on the radionuclide transport and retention. We sampled a number of rock specimens and then acquired the rock fracture images. The quaternion convolution can be used to detect the rock fracture edges. In this paper, a simplified quaternion convolution algorithm is presented and a set of quaternion masks at different scales are presented. The signs are computed for modulus maximum suppression in the horizontal and vertical direction respectively. In order to suppress the noise, we use the average weighting for the results at different scales. Experimental results show that the proposed method is effective and robust. Moreover, this method has an important contribution to rock engineering..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 76 (2009)
A Real-time Distortion Correction Method with Concentric Circles as Onsite Standard
LU Quan, LIU Shang-qian, and WANG Hui-feng
To improve the measuring precision of photoelectronic measurement system for curvature (important status parameter of cannon), a real-time distortion correction method with concentric circles as onsite standard is proposed and a set of measuring apparatus with self-center adaptation is designed. Firstly, the eccentric To improve the measuring precision of photoelectronic measurement system for curvature (important status parameter of cannon), a real-time distortion correction method with concentric circles as onsite standard is proposed and a set of measuring apparatus with self-center adaptation is designed. Firstly, the eccentric distortion is corrected by adjusting the horizontal and vertical location of target in the measuring apparatus. Then, the distortion situation of optical system is detected in real time based on the concentric circles as onsite standard which is extracted by using curvature estimation. Finally, the correction is made for the curvature measuring result to accomplish it with high accuracy according to the detection. Experiment results show that the method proposed is quite stable, fast and accurate. Compared with the traditional correction methods, the measuring errors of curvature measuring system whose focus is 6.00 mm are improved from±0.15 mm to±0.05 mm after correction, and the time of a single correction is less than 0.49 s, which can improve the measuring precision of system efficiently..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 81 (2009)
Direction-judgable Fiber Displacement Interferometer for Vibration Measurement
WANG De-tian, LI Ze-ren, and PENG Qi-xian
The Direction-judgable Fiber Displacement Interferometer (DJFDI) was proposed on the basis of optical Doppler effect and heterodyne technique. The proposed interfermeter was assembled by using the components well developed in the telecommunication industry, which consisted of a fiber-pigtail semiconductor laser, a 1The Direction-judgable Fiber Displacement Interferometer (DJFDI) was proposed on the basis of optical Doppler effect and heterodyne technique. The proposed interfermeter was assembled by using the components well developed in the telecommunication industry, which consisted of a fiber-pigtail semiconductor laser, a 1×2 fiber coupler, a three-port optical circulator, a fiber probe, a 3×3 fiber coupler, a detector, an oscilloscope, and so on. Based on above original configuration, EDFA was utilized in DJFDI to enhance the signal power. The signal processing method based on Lissajous figure was brought forward. The vibration of piezoelectric ceramic vibration was measured to study its measurement capability of micro-displacement and the influencing factors. The experimental results show that the dominant influencing factor is nonideality of 3×3 fiber coupler, such as instability of the output phase difference of the DJFDI’s interference signals..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 86 (2009)
Mutual Check of Angular Deviation for Regular Polygonal Prism and Precise Angle Dividing Table
QIU Zu-rong, CHEN Qing-qing, and LI Jing-jie
Referring to the disadvantage of permutation intercomparision method, such as complex operation and heavy workload in mutual check of two circle dividing devices, permutation ruled angle method is used to realize the mutual check of angular deviation for regular polygonal prism and precise angle dividing table. After eReferring to the disadvantage of permutation intercomparision method, such as complex operation and heavy workload in mutual check of two circle dividing devices, permutation ruled angle method is used to realize the mutual check of angular deviation for regular polygonal prism and precise angle dividing table. After each serial measurement, it is not necessary to change the relative position of the two pitch circle devices, so the process of mutual check is simplified and the measuring time is shortened. The mutual check principle and operation steps, the design of experimental device were introduced in detail, and the experimental data of the mutual check for regular polygonal prism and precise angle dividing table were presented. Furthermore, the random errors of the measurement results were analyzed and calculated. At last, by comparing the results of two different experiments, the correctness of this method was verified..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 90 (2009)
Optical Fiber Temperature Sensor Based on Temperature-dependent Optical Properties of ZnO Film on the Sapphire Fiber-ending
SUI Cheng-hua, ZHENG Dong, LIU Yu-ling, CAI Ping-gen, and XU Xiao-jun
ZnO thin film was grown on the sapphire fiber-ending by Electron-beam Evaporation (EBE). The transmittance spectra show that the optical absorption edge red shifts obviously with increasing temperature. Based on negative temperature effect of the optical absorption edge of the ZnO thin film, transmissive optical fiber ZnO thin film was grown on the sapphire fiber-ending by Electron-beam Evaporation (EBE). The transmittance spectra show that the optical absorption edge red shifts obviously with increasing temperature. Based on negative temperature effect of the optical absorption edge of the ZnO thin film, transmissive optical fiber temperature senor was designed and fabricated. In the range from room temperature to 500 ℃, the sensitivity is beyond 0.05 nm/℃ with the experiment. The measuring temperature range of the sensor can be from -260 ℃ to 700 ℃ in theory. Compared with the traditional temperature sensor, the temperature sensor has the advantages of simpler structure, lower cost, better stability and broader measurement range..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 94 (2009)
Kerr Effect in Brillouin Fiber-optic Ringesonator
LI Xu-you, ZHANG Yong, ZHANG Chen, and WANG Jun
Based on the mechanism of Kerr effect in Brillouin Fiber-optic Ring Resonator(BFRR), the resonant cavity characteristic is researched theoretically when considering the Kerr effect, in order to get the possibility of occurrence of first-order Stokes light optical bistability. Experiments show that the optical bistabiliBased on the mechanism of Kerr effect in Brillouin Fiber-optic Ring Resonator(BFRR), the resonant cavity characteristic is researched theoretically when considering the Kerr effect, in order to get the possibility of occurrence of first-order Stokes light optical bistability. Experiments show that the optical bistability in 30 meters short cavity happens while input light intensity is about 440 μW, and the bistability is related with coupling coefficient and the insertion loss of the cavity coupler. Secondly, the Kerr effect in BFRR of Brillouin Fiber-optic Gyroscope (BFOG) is analyzed, focusing on the influence of resonant deviation on gyroscope nonlinear output and dynamic working range. Furthermore, the double-loop BFOG program is proposed, which provides a potential solution of Kerr effect error in Brillouin fiber-optic gyroscope..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 100 (2009)
A Fast Thresholding Method Based on Maximum Fuzzy Correlation Criterion
GAO Chao, NIE Fang-yan, and GUO Yong-cai
Owing to the some fuzzy features of digital image in nature, a fast maximum fuzzy correlation criterion thresholding method was proposed based on the analysis of limitation of conventional fuzzy entropy method. Firstly, the image was transformed into fuzzy domain by fuzzy member function. Then, the total amounts of fuzOwing to the some fuzzy features of digital image in nature, a fast maximum fuzzy correlation criterion thresholding method was proposed based on the analysis of limitation of conventional fuzzy entropy method. Firstly, the image was transformed into fuzzy domain by fuzzy member function. Then, the total amounts of fuzzy correlation provided by object and background distributions of image histogram was computed according to the definition of correlation, and the optimal threshold was determined by maximum fuzzy correlation criterion. In addition, in order to obtain optimal threshold quickly, the differential evolution algorithm was used to obtain the optimal parameters of fuzzy member function. Finally, the proposed method was tested on real images and compared with other several typical thresholding methods. The experimental results indicate that the proposed method obtains good performance, and satisfies the requirement of real-time..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 105 (2009)
Image Denoising Based on Complex Contourlet Transform
CHEN Xin-wu, GONG Jun-bin, LIU Wei, and TIAN Jin-wen
In order to overcome the aliasing phenomenon commonly existing in real contourlet transform image denoising, some characters of complex contourlet transform whose structure is a cascading of dual tree complex wavelet and directional filter banks are discussed. It is proved that the transform performs well at division aIn order to overcome the aliasing phenomenon commonly existing in real contourlet transform image denoising, some characters of complex contourlet transform whose structure is a cascading of dual tree complex wavelet and directional filter banks are discussed. It is proved that the transform performs well at division and restraining ability under white Gaussian noise condition. Then, an image denoising algorithm was proposed based on the transform. Furthermore, Mento-Carlo method was used to find convergence factors for modifying the 3σ rule, and hard threshold method was carried on complex contourlet tranform domain coefficients. Experimental results show that the image denoising algorithm proposed in this paper is superior to that using real contourlet transform both at Peak Signal-to-noise Ratio (PSNR) values and visual quality..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 111 (2009)
Fast Total Variation Image Restoration Based on Multi-step Iteration Method
LU Xiao-lei, HUANG Ben-xiong, and WANG Fu-rong
Referring to the problem of slow convergence rate of current Total Variation (TV) image restoration algorithm, a class of fast TV image restoration algorithms was proposed by using multi-step iteration method. And, two kinds of multi-step TV restoration algorithms were proposed: multi-step iteration shrinkage/thresholdReferring to the problem of slow convergence rate of current Total Variation (TV) image restoration algorithm, a class of fast TV image restoration algorithms was proposed by using multi-step iteration method. And, two kinds of multi-step TV restoration algorithms were proposed: multi-step iteration shrinkage/threshold algorithm and multi-step iteration re-weighted shrinkage algorithm. Furthermore, to overcome the shortcoming of weight parameters estimation at each iteration step, a kind of fixed weigh parameters multi-step TV restoration algorithm was given. Compared with the traditional single-step TV restoration algorithms, the computational complexity of the proposed algorithms was not added in each iteration step and the convergence could be achieved by less iteration numbers. Experimental results demonstrate that the convergence performance of our proposed algorithms is much higher than that of traditional single-step iteration restoration algorithms by recovering different type degraded images, so our algorithms are efficient..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 116 (2009)
Edge Detection Based on Derivative Algorithm in Arbitrary Directions
ZHANG Bin, SONG Yang, and HE An-zhi
A new edge detection technique based on derivative algorithm in arbitrary directions is developed. Discrete representation of derivative for grey image and determination of optimal response direction are important to edge detection techniques. The mathematic model of derivative for grey image was represented, and the fA new edge detection technique based on derivative algorithm in arbitrary directions is developed. Discrete representation of derivative for grey image and determination of optimal response direction are important to edge detection techniques. The mathematic model of derivative for grey image was represented, and the first derivative and the second derivative algorithms in arbitrary directions were derived from the basic derivative definition. Based on the characteristic analysis of image edge, the grey-level gradients and Laplace transforms in multi-directions or full directions of view were calculated, and the maximums determined the output values for the edge magnitude image. The new algorithm is demonstrated to be valid by detecting the edge of normal image and some advantages of the algorithm are represented over the conventional edge operators..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 124 (2009)
Edge Detection Method Based on Linear Singularity of Image
WANG Min, ZHANG Yan-ning, and SUN Jin-qiu
A method based on linear singularity analysis of image is presented. The improved method, called Directional Beamlet Transform (DBT) is better than traditional Beamlet transform about directional information of image and has the ability of representing linear-singularity of image. According to the analysis of linear siA method based on linear singularity analysis of image is presented. The improved method, called Directional Beamlet Transform (DBT) is better than traditional Beamlet transform about directional information of image and has the ability of representing linear-singularity of image. According to the analysis of linear singularity, edge detection is transferred to detecting singularity point in the coefficient matrix of DBT. Because the noise has point-singularity and the edges have linear-singularity in noisy images, the method based on linear singularity analysis can reduce the influence of noises. The experimental results on manual images and SAR images demonstrate the effectiveness of this method. Compared with traditional edge detectors, it is shown that proposed method has the ability of anti-noise and linear connection..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 129 (2009)
Detection and Localization of the Mouth Based on Local Gradient Operator
JIN Wei, ZHANG Jian-qi, and ZHANG Xiang
A fast and accurate method of automatic detection and location of the mouth is proposed according to the feature extraction of face identification. At first, mouth region is roughly detected by Adaboost in face image, so the range of search is reduced. Then, mouth contour is detected by local gradient operator and binaA fast and accurate method of automatic detection and location of the mouth is proposed according to the feature extraction of face identification. At first, mouth region is roughly detected by Adaboost in face image, so the range of search is reduced. Then, mouth contour is detected by local gradient operator and binarized by Ostu threshold method. Finally, the mouth corners are accurately localized by Chain code tracking. The experiment results indicate that this method can detect and locate mouth corners fast and exactly. It can reduce the influence of facial expression and posture and improve the recognition rate of face identification..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 135 (2009)
Design of Analog Front End Circuit for ICX274 Based on AD9923A
MO Si-te, and LI Bi-xiong
The ICX274 is a diagonal 8.923mm interline CCD solid-state image sensor with a square pixel array and 2.01M effective pixels. Progressive scan allows all pixels' signals to be outputted independently within approximately 1/15 second. The methodology of designing the Analog Front End (AFE) for ICX274 was presented. The ICX274 is a diagonal 8.923mm interline CCD solid-state image sensor with a square pixel array and 2.01M effective pixels. Progressive scan allows all pixels' signals to be outputted independently within approximately 1/15 second. The methodology of designing the Analog Front End (AFE) for ICX274 was presented. AD9923A was used as AFE. The functional block of AD9923A was discussed and how to set the control register was introduced. Compared with the circuit proposed by SONY, the design with simple hardware structure was low cost and high reliability. Tests show that the timing of the horizontal and vertical drivers met the requirements of the timing of ICX274, and could drive ICX274 to output analog video signal..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 141 (2009)
Experimental Installation Investigation of Stressed Mirror Polishing
SUN Tian-xiang, YANG Li, WU Yong-qian, WAN Yong-jian, and FAN Bin
Stressed Mirror Polishing (SMP) based on mechanics of elasticity is a novel aspheric fabrication technology that could transform aspheric optical fabrication technology into sphere optical fabrication technology. Considering glass characteristic and deformation between paraboloid and sphere surface generated by applicaStressed Mirror Polishing (SMP) based on mechanics of elasticity is a novel aspheric fabrication technology that could transform aspheric optical fabrication technology into sphere optical fabrication technology. Considering glass characteristic and deformation between paraboloid and sphere surface generated by application moment periphery of thin-plate, experimental installation of stressed mirror polishing is designed, fabricated and adjusted in this paper. Having been fabricated a paraboloid mirror of Φ314 mm diameter and F/7 for example to analyze the optical fabrication technology progress of paraboloid, rationality and effectiveness of experimental installation have been investigated. By establishing measurement system of paraboloid to analyze the experiment result and adopting interferometer to get surface shape of finished paraboloid, PV=3.317λ, rms=0.489λ, the results indicate that the experimental installation of stressed mirror polishing can be used to produce the axisymmetric aspheric mirrors with high precision and efficiency..
Opto-Electronic Engineering
- Publication Date: Oct. 08, 2021
- Vol. 36, Issue 10, 146 (2009)
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