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Shape-controlled Synthesis and Related Growth Mechanism of Pb（OH）2 Nanorods by Solution-Phase Reaction

Chinese Physics Letters 2010年第5期27卷 223-226页

作者：程进邹小平宋维力曹茂盛苏燚杨刚强吕学明张福学 School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 Research Center for Sensor Technology Beijing Key Laboratory for Sensor Beijing Information Science and Technology University Jianxiangqiao Campus Beijing 100101 Ministry-of-Education Key Laboratory for Modern Measurement and Control Technology Beijing 100101 School of Material Science and Engineering Beijing Institute of Technology Beijing 100081

We present a simple method to synthesize Pb（OH）2 nanorods by solution-phase reaction. Rod-like lead hydroxide precipitates are obtained by mixing lead nitrate with a concentration of about 0.01 M and potassium hydroxide with concentration of about O.03 M in an aqueous solution. Sodium chloride as an additive is premixed with the lead nitrate aqueous solution. The presence of chloride ions in the precursor solution results in the rod-like morphology of lead hydroxide precipitates. The growth mechanism of the lead hydroxide nanorods is discussed.

关键词： INORGANIC compounds -- Synthesis CRYSTAL growth LEAD compounds SOLUTION (Chemistry) PRECIPITATION (Chemistry) NANOSTRUCTURED materials

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Algorithm of global collision detection for machining freeform surfaces

Algorithm of global collision detection for machining freefo...

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International Conference on Advanced Technology of Design and Manufacture, ATDM 2010

作者： Zhong, Jianlin Yang, Qingdong Chen, Xiumei School of Mechanical and Electrical Engineering Beijing Information Science and Technology University Ministry of Education Key Laboratory of Measurement and Control Technology Beijing 100192 China

ISBN: (纸本)9781849192385

The existed algorithms for global collision checking in freeform surfaces machining have been analyzed, and a new efficient algorithm is proposed for collision checking in NC machining of freeform surfaces. First, an oblique cube convex hull of the freeform surface is applied to check whether there is intersection between the tool orientation and the oblique cube convex hull. If there is no intersection, it means the tool orientation is feasible. Otherwise, the detailed feasibility checking is developed to detect whether there is a global collision between the freeform surface and the tool orientation. Once there is collision, the tool orientation will be adjusted to avoid the global collision.

关键词： Computational geometry

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Adaptive integral dynamic surface control based on fully tuned radial basis function neural network

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Journal of systems engineering and Electronics 2010年第6期21卷 1072-1078页

作者： Li Zhou Shumin Fei Changsheng Jiang Key Laboratory of Measurement and Control of CES of Ministry of Education Southeast University Nanjing 210096 R R. China School of Automation Southeast University Nanjing 210096 R R. China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 R R. China

An adaptive integral dynamic surface control approach based on fully tuned radial basis function neural network （FTRBFNN） is presented for a general class of strict-feedback nonlinear systems,which may possess a wide class of uncertainties that are not linearly parameterized and do not have any prior knowledge of the bounding *** is employed to approximate the uncertainty online,and a systematic framework for adaptive controller design is given by dynamic surface control. The control algorithm has two outstanding features,namely,the neural network regulates the weights,width and center of Gaussian function simultaneously,which ensures the control system has perfect ability of restraining different unknown uncertainties and the integral term of tracking error introduced in the control law can eliminate the static error of the closed loop system effectively. As a result,high control precision can be *** signals in the closed loop system can be guaranteed bounded by Lyapunov ***,simulation results demonstrate the validity of the control approach.

关键词： adaptive control integral dynamic surface control fully tuned radial basis function neural network.

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Improved Fourier transform profilometry based on color pattern projection

Improved Fourier transform profilometry based on color patte...

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Chinese Conference on Pattern Recognition

作者： Huang, Hao Da, Feipeng Key Laboratory of Measurement and Control for Complex System of Ministry of Education Institute of Automation Southeast University Nanjing 210096 China

ISBN: (纸本)9781424472109

In this paper a novel 3D shape measurement technique based on color fringe projection is proposed to solve the spectrum aliasing and phase unwrapping issues existed in Fourier transform profilometry. Set the RG components of the color fringe to two different frequencies of sinusoidal pattern and the B component to the average value of R or G component. Then project the pattern to the object. Separate these RGB components of the captured color pattern and use our method to process these three gray patterns. By using the proposed method, the background and high frequency noises can be eliminated during FTP process, also the accurate unwrapped phase which contains the height information can be got by using two frequencies of wrapped phase to unwrap the phase. Only one frame color pattern is needed to get the 3D information of an object. Experiment results show that the 3D information of an object can be obtained rapidly and accurately using the proposed method. And also the object can be measured dynamically. ©2010 IEEE.

关键词： Fourier transforms

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A New Accurate Method of Compensating Phase-Shifting Error

A New Accurate Method of Compensating Phase-Shifting Error

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Chinese Conference on Pattern Recognition (CCPR)

作者： Lin Zhu Feipeng Da Shaoyan Gai Key Laboratory of Measurement and Control of Complex System of Ministry of Education College of Automation South-East University Nanjing China

A new accurate phase-shifting error compensating algorithm for phase-measuring profilometry is proposed and proved. In this error detecting algorithm, we use three adjacent phase points for research object, approximately suppose that the sinusoidal fringe projection to the plate, the phase differences between adjacent pixels are equal. Then we put the phase shift error into the original algorithm for error compensation. Simulation results show the inhibitory effect of the errors after using the new algorithm for error compensation. Lastly we use the new algorithm for three-dimensional reconstruction of physical measurement. The final effect image shows obviously that the new compensation algorithm is better than the original. So this error extracting algorithm can effectively improve the accuracy of three-dimensional measurement.

关键词： Optimized production technology Phase shifting interferometry Algorithm design and analysis Optical interferometry measurement uncertainty Phase measurement Approximation algorithms

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A new accurate method of compensating phase-shifting error

A new accurate method of compensating phase-shifting error

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Chinese Conference on Pattern Recognition

作者： Zhu, Lin Da, Feipeng Gai, Shaoyan Key Laboratory of Measurement and Control for Complex System of Ministry of Education Colledge of Automation Southeast University Nanjing 210096 China

ISBN: (纸本)9781424472109

关键词： Error compensation

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Improved Fourier Transform Profilometry Based on Color Pattern Projection

Improved Fourier Transform Profilometry Based on Color Patte...

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Chinese Conference on Pattern Recognition (CCPR)

作者： Hao Huang Feipeng Da Key Laboratory of Measurement and Control of Complex System of Ministry of Education Institute of Automation South-East University Nanjing China

关键词： Fourier transforms Color Shape measurement Charge coupled devices Three dimensional displays measurement by laser beam

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Stereo Reconstruction Based on Local Edge Detection and Binocular Stereo Matching

Stereo Reconstruction Based on Local Edge Detection and Bino...

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Chinese Conference on Pattern Recognition (CCPR)

作者： Fu He Feipeng Da Key Laboratory of Measurement and Control of Complex System of Ministry of Education Research Institute of Automation South-East University Nanjing China

A stereo reconstruction algorithm is proposed, which combines techniques of local edge detection, stereo matching and binocular vision. Firstly, the left and right images of the object are taken by calibrated binocular cameras. Then, in rectified matching images, the closed local edge is formed surrounding each pixel by Prewitt edge operator in order to construct an adaptive window, in which cost aggregation is calculated by normalized cross-correlation-coefficient. Next, local winner-take-all optimization is used to obtain disparity, and image smoothing technique is introduced to reduce matching errors. Finally, points cloud of the object is produced based on calibration information of binocular cameras and results of stereo matching. The experimental results show that the proposed algorithm can overcome impacts of real environment on reconstruction system and successfully achieves smooth and vivid 3D points cloud models of different real objects with high automation degree.

关键词： Stereo image processing Computer vision Image edge detection Image reconstruction Pattern recognition Conferences

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An improved image segmentation based stereo matching algorithm

An improved image segmentation based stereo matching algorit...

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Chinese Conference on Pattern Recognition

作者： Shao, Jing Da, Feipeng Key Laboratory of Measurement and Control for Complex System of Ministry of Education Research Institute of Automation Southeast University Nanjing 210096 China

ISBN: (纸本)9781424472109

In order to decrease the mismatching problem in low texture and occluded areas, an improved algorithm based on image segmentation is proposed. Firstly, the adaptive polygon-based support window is adopted for initial disparity estimation, then the reliable matching points derived through left-right constraint are used to compute the disparity planes in the segmentation areas;finally the disparity planes are used to constraint the disparity estimation and as a reference of the energy function, then the Tree DP is introduced to compute the optimal disparity for every pixel. In order to testify the validity and practicability of the algorithm, firstly we use it in the matching of the standard images, the experimental results show that our algorithm has a better performance in areas of low texture and occluded areas and a higher matching accuracy, and then the reconstruction results of the real images shows a smooth and valid point cloud model. ©2010 IEEE.

关键词： Image segmentation

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Stereo Matching Based on Dissimilar Intensity Support

Stereo Matching Based on Dissimilar Intensity Support

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Chinese Conference on Pattern Recognition (CCPR)

作者： Fu He Feipeng Da Key Laboratory of Measurement and Control of Complex System of Ministry of Education Research Institute of Automation South-East University Nanjing China

This paper presents a local stereo matching algorithm based on the window construction method using local edge detection. In order to improve performance of window-based cost aggregation computation, a new rule called Dissimilar Intensity Support technique is proposed to distinguish support pixels with dissimilar intensities from those with similar intensity for each centered pixel. According to the proposed rule, support pixels away from centered pixel with dissimilar intensities are used to compute cost aggregation for enhancing intensity variation in local support region. Initial disparity is obtained by classical Winner-Take-All method. Then disparity refinement based on pixels near center with similar intensity as well as smooth disparity is introduced to rectify mismatch. The experimental results based on Middlebury stereo benchmark show that the proposed algorithm has good performance especially in low textured region with only few parameters.

关键词： Pixel Stereo vision Image edge detection Image color analysis Algorithm design and analysis Computer vision Benchmark testing

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