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Multi-objective strategy to optimize dithering technique for high-quality three-dimensional shape measurement 被引量:2
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作者 Ning Cai Zhe-Bo Chen +1 位作者 Xiang-Qun Cao Bin Lin 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第10期381-386,共6页
Dithering optimization techniques can be divided into the phase-optimized technique and the intensity-optimized technique. The problem with the former is the poor sensitivity to various defocusing amounts, and the pro... Dithering optimization techniques can be divided into the phase-optimized technique and the intensity-optimized technique. The problem with the former is the poor sensitivity to various defocusing amounts, and the problem with the latter is that it cannot enhance phase quality directly nor efficiently. In this paper, we present a multi-objective optimization framework for three-dimensional(3D) measurement by utilizing binary defocusing technique. Moreover, a binary patch optimization technique is used to solve the time-consuming issue of genetic algorithm. It is demonstrated that the presented technique consistently obtains significant phase performance improvement under various defocusing amounts. 展开更多
关键词 three-dimensional(3d) shape measurement MULTI-OBJECTIVE dithering GENETIC algorithm
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New Approach for 3D Shape Measurement Based on Color-Coded Fringe and Neural Network
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作者 QIN Da-hui, SHI Yu-sheng, WANG Cong-jun , LI Zhong-wei (State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China) 《Computer Aided Drafting,Design and Manufacturing》 2008年第2期50-56,共7页
A new 3D surface contouring and ranging system based on digital fringe projection and phase shifting technique is presented. Using the phase-shift technique, points cloud with high spatial resolution and limited accur... A new 3D surface contouring and ranging system based on digital fringe projection and phase shifting technique is presented. Using the phase-shift technique, points cloud with high spatial resolution and limited accuracy can be generated. Stereo-pair images obtained from two cameras can be used to compute 3D world coordinates of a point using traditional active triangulation approach, yet the camera calibration is crucial. Neural network is a well-known approach to approximate a nonlinear system without an explicit physical model, in this work it is used to train the stereo vision application system to calculating 3D world coordinates such that the camera calibration can be bypassed. The training set for neural network consists of a variety of stereo-pair images and the corresponding 3D world coordinates. The picture elements correspondence problem is solved by using projected color-coded fringes with different orientations. Color imbalance is completely eliminated by the new color-coded method. Once the high accuracy correspondence of 2D images with 3D points is acquired, high precision 3D points cloud can be recognized by the well trained net. The obvious advantage of this approach is that high spatial resolution can be obtained by the phase-shifting technique and high accuracy 3D object point coordinates are achieved by the well trained net which is independent of the camera model works for any type of camera. Some experiments verified the performance of the method. 展开更多
关键词 3d shape measurement color-coded fringe neural network correspondence problem color imbalance
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Balanced Functional Maps for Three-Dimensional Non-Rigid Shape Registration
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作者 Xu-Peng Wang Hang Lei +1 位作者 Yan Liu Nan Sang 《Journal of Electronic Science and Technology》 CAS CSCD 2021年第4期369-378,共10页
Three-dimensional(3D)shape registration is a challenging problem,especially for shapes under non-rigid transformations.In this paper,a 3D non-rigid shape registration method is proposed,called balanced functional maps... Three-dimensional(3D)shape registration is a challenging problem,especially for shapes under non-rigid transformations.In this paper,a 3D non-rigid shape registration method is proposed,called balanced functional maps(BFM).The BFM algorithm generalizes the point-based correspondence to functions.By choosing the Laplace-Beltrami eigenfunctions as the function basis,the transformations between shapes can be represented by the functional map(FM)matrix.In addition,many constraints on shape registration,such as the feature descriptor,keypoint,and salient region correspondence,can be formulated linearly using the matrix.By bi-directionally searching for the nearest neighbors of points’indicator functions in the function space,the point-based correspondence can be derived from FMs.We conducted several experiments on the Topology and Orchestration Specification for Cloud Applications(TOSCA)dataset and the Shape Completion and Animation of People(SCAPE)dataset.Experimental results show that the proposed BFM algorithm is effective and has superior performance than the state-of-the-art methods on both datasets. 展开更多
关键词 Functional map(FM) Laplace-Beltrami operator shape registration three-dimensional(3d)non-rigid shape.
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Optimized dithering technique in frequency domain for high-quality three-dimensional depth data acquisition 被引量:2
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作者 Ning Cai Zhe-Bo Chen +1 位作者 Xiang-Qun Cao Bin Lin 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第8期124-131,共8页
On the basis of the objective functions,dithering optimization techniques can be divided into the intensity-based optimization technique and the phase-based optimization technique.However,both types of techniques are ... On the basis of the objective functions,dithering optimization techniques can be divided into the intensity-based optimization technique and the phase-based optimization technique.However,both types of techniques are spatial-domain optimization techniques,while their measurement performances are essentially determined by the harmonic components in the frequency domain.In this paper,a novel genetic optimization technique in the frequency domain is proposed for highquality fringe generation.In addition,to handle the time-consuming difficulty of genetic algorithm(GA),we first optimize a binary patch,then join the optimal binary patches together according to periodicity and symmetry so as to generate a full-size pattern.It is verified that the proposed technique can significantly enhance the measured performance and ensure the robustness to various amounts of defocusing. 展开更多
关键词 FRINGE generation GENETIC algorithm frequency dOMAIN 3d shape measurement
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PCA-based 3D Shape Reconstruction of Human Foot Using Multiple Viewpoint Cameras 被引量:2
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作者 Edmée Amstutz Tomoaki Teshima +2 位作者 Makoto Kimura Masaaki Mochimaru Hideo Saito 《International Journal of Automation and computing》 EI 2008年第3期217-225,共9页
This paper describes a multiple camera-based method to reconstruct the 3D shape of a human foot. From a foot database, an initial 3D model of the foot represented by a cloud of points is built. The shape parameters, w... This paper describes a multiple camera-based method to reconstruct the 3D shape of a human foot. From a foot database, an initial 3D model of the foot represented by a cloud of points is built. The shape parameters, which can characterize more than 92% of a foot, are defined by using the principal component analysis method. Then, using "active shape models", the initial 3D model is adapted to the real foot captured in multiple images by applying some constraints (edge points' distance and color variance). We insist here on the experiment part where we demonstrate the efficiency of the proposed method on a plastic foot model, and also on real human feet with various shapes. We propose and compare different ways of texturing the foot which is needed for reconstruction. We present an experiment performed on the plastic foot model and on human feet and propose two different ways to improve the final 3D shapers accuracy according to the previous experiments' results. The first improvement proposed is the densification of the cloud of points used to represent the initial model and the foot database. The second improvement concerns the projected patterns used to texture the foot. We conclude by showing the obtained results for a human foot with the average computed shape error being only 1.06 mm. 展开更多
关键词 shape measurement 3d reconstruction from multiview cameras principal component analysis
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Multi-Schlieren CT Measurements of Supersonic Microjets from Circular and Square Micro Nozzles 被引量:1
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作者 Ahmad Zaid Nazari Yojiro Ishino +6 位作者 Yuta Ishiko Fumiya Ito Harumi Kondo Ryoya Yamada Takanori Motohiro Yoshiaki Miyazato Shinichiro Nakao 《Journal of Flow Control, Measurement & Visualization》 2020年第3期77-101,共25页
Instantaneous three-dimensional (3D) density distributions of a shock-cell structure of perfectly and imperfectly expanded supersonic microjets escaping into an ambient space are measured. For the 3D observation of su... Instantaneous three-dimensional (3D) density distributions of a shock-cell structure of perfectly and imperfectly expanded supersonic microjets escaping into an ambient space are measured. For the 3D observation of supersonic microjets, non-scanning 3D computerized tomography (CT) technique using a 20-directional quantitative schlieren optical system with flashlight source is employed for simultaneous schlieren photography. The 3D density distributions data of the microjets are obtained by 3D-CT reconstruction of the projection’s images using maximum likelihood-expectation maximization. Axisymmetric convergent-divergent (Laval) circular and square micro nozzles with operating nozzle pressure ratio 5.0, 4.5, 4.0, 3.67, and 3.5 have been studied. This study examines perfectly expanded, overexpanded, and underexpanded supersonic microjets issued from micro nozzles with fully expanded jet Mach numbers <em>M</em><em><sub>j</sub></em> ranging from 1.47 - 1.71, where the design Mach number is <em>M<sub>d</sub></em> = 1.5. A complex phenomenon for free square microjets called axis switching is clearly observed with two types “upright” and “diagonal” of “cross-shaped”. The initial axis-switching is 45<span style="white-space:nowrap;">°</span> within the first shock-cell range. In addition, from the symmetry and diagonal views of square microjets for the first shock-cells, two different patterns of shock waves are viewed. The shock-cell spacing and supersonic core length for all nozzle pressure ratios are investigated and reported. 展开更多
关键词 Supersonic Microjet Multi-directional Quantitative Schlieren Optical System three-dimensional (3d) measurement Computerized Tomography (CT) Circular and Square Micro Laval Nozzles
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Dual-frequency fringe for improving measurement accuracy of three-dimensional shape measurement 被引量:2
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作者 Zixiao Miao Qican Zhang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2021年第10期81-87,共7页
A new phase unwrapping method based on dual-frequency fringe is proposed to improve both high accuracy and large measurement range of three-dimensional shape measurement by synthesizing the projected dual-frequency fr... A new phase unwrapping method based on dual-frequency fringe is proposed to improve both high accuracy and large measurement range of three-dimensional shape measurement by synthesizing the projected dual-frequency fringes obtaining higher and lower frequencies.The lower-frequency one is their phase difference,which can help unwrap the wrapped phase of the higher-frequency one from their phase sum.In addition,the relationship between the measuring accuracy and the frequencies of the projected fringes is studied to guide the frequency selection in actual measurement.It is found that the closer the two frequencies are,the higher the measurement accuracy will be.The computer simulation and experiment results show the viability of this method. 展开更多
关键词 fringe projection 3d shape measurement dual frequency phase shifting phase sum
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A Novel 360°3D Profilometry
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作者 SONG Yuanhe,ZHAO Hong,FAN Hua,CHEN Wenyi,TAN Yushan (Research Institute for Laser & Infrared Applications, Xi’an Jiaotong University,Xi’an 710049,CHN) 《Semiconductor Photonics and Technology》 CAS 1998年第1期45-49,共5页
A new method of 360° turning 3D shape measurement in which light sectioning and phase shifting techniques are both used is presented in this paper.A sine light field is applied in the projected light stripe,meanw... A new method of 360° turning 3D shape measurement in which light sectioning and phase shifting techniques are both used is presented in this paper.A sine light field is applied in the projected light stripe,meanwhile phase shifting technique is used to calculate phase of the light slit.Thereafter wrapped phase distribution of the slit is formed and the unwrapping process will be made by means of the height information based on the light sectioning method.Therefore phase measuring results with better precision can be obtained.At last the target 3D shape data can be produced according to geometric relationships between phases and the object heights.The principles of this method are discussed in detail and experimental results are shown in this paper. 展开更多
关键词 Light Sectioning Phase Shifting Phase Unwrapping Algorithm 3d shape measurement
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A novel method for geometric quality assurance of rock joint replicas in direct shear testing-Part 2:Validation and mechanical replicability
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作者 J.Larsson F.Johansson +3 位作者 D.Mas Ivars E.Johnson M.Flansbjer N.W.Portal 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第9期2209-2223,共15页
Each rock joint is unique by nature which means that utilization of replicas in direct shear tests is required in experimental parameter studies.However,a method to acquire knowledge about the ability of the replicas ... Each rock joint is unique by nature which means that utilization of replicas in direct shear tests is required in experimental parameter studies.However,a method to acquire knowledge about the ability of the replicas to imitate the shear mechanical behavior of the rock joint and their dispersion in direct shear testing is lacking.In this study,a novel method is presented for geometric quality assurance of replicas.The aim is to facilitate generation of high-quality direct shear testing data as a prerequisite for reliable subsequent analyses of the results.In Part 1 of this study,two quality assurance parameters,smf and V_(Hp100),are derived and their usefulness for evaluation of geometric deviations,i.e.geometric reproducibility,is shown.In Part 2,the parameters are validated by showing a correlation between the parameters and the shear mechanical behavior,which qualifies the parameters for usage in the quality assurance method.Unique results from direct shear tests presenting comparisons between replicas and the rock joint show that replicas fulfilling proposed threshold values of σ_(mf)<0.06 mm and|V_(Hp100)|<0.2 mm have a narrow dispersion and imitate the shear mechanical behavior of the rock joint in all aspects apart from having a slightly lower peak shear strength.The wear in these replicas,which have similar morphology as the rock joint,is in the same areas as in the rock joint.The wear is slightly larger in the rock joint and therefore the discrepancy in peak shear strength derives from differences in material properties,possibly from differences in toughness.It is shown by application of the suggested method that the quality assured replicas manufactured following the process employed in this study phenomenologically capture the shear strength characteristics,which makes them useful in parameter studies. 展开更多
关键词 three-dimensional(3d)scanning Contact area measurements direct shear testing Geometric quality assurance Mechanical replicability Replicas Rock joint
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3-D Shape Measurement of Complex Objects by Combining Color-Coded Fringe and Neural Networks 被引量:1
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作者 秦大辉 李中伟 +1 位作者 王从军 史玉升 《Tsinghua Science and Technology》 SCIE EI CAS 2009年第S1期66-70,共5页
A new approach for three dimensional (3-D) shape measurement was proposed based on colorcoded fringe and neural networks. By applying the phase-shift technique to fringe projection, point clouds were generated with hi... A new approach for three dimensional (3-D) shape measurement was proposed based on colorcoded fringe and neural networks. By applying the phase-shift technique to fringe projection, point clouds were generated with high spatial resolution and limited accuracy. The picture element correspondence problem was solved by using projected color-coded fringes with different orientations. Once the high accurate corresponding points were decided, high precision dense 3-D points cloud was calculated by the well trained net. High spatial resolution can be obtained by the phase-shift technique and high accuracy 3-D object point coordinates are achieved by the well trained net, which is not dependent on the camera model and will work for any type of camera. Some experiments verify the performance of this method. 展开更多
关键词 three dimensional (3-d) shape measurement color-coded fringe neural networks correspondence problem
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Error compensation for three-dimensional profile measurement system
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作者 Xu YE Haobo CHENG +1 位作者 Zhichao DONG Hon-Yuen TAM 《Frontiers of Optoelectronics》 CSCD 2015年第4期402-412,共11页
Three-dimensional (3D) profile measurement is an indispensable process for assisting the manufacture of various optic, especially aspheric surfaces. This work presents the measurement error calibration of a 3D profi... Three-dimensional (3D) profile measurement is an indispensable process for assisting the manufacture of various optic, especially aspheric surfaces. This work presents the measurement error calibration of a 3D profile measurement system, namely PMI700. Measurement errors induced by measuring tool radius, alignment error and the temperature variation were analyzed through geometry analysis and simulation. A quantitative method for the compensation of tool radius and an alignment error compensation model based on the least square method were proposed to reduce the measurement error. To verify the feasibility of PMI700, a plane and a non-uniform hyperboloidal mirror were measured by PMI700 and interferometer, respectively. The data provided by two systems were high coincident. The direct subtractions of results from two systems indicate RMS deviations for both segments were less than 0.22. 展开更多
关键词 aspheric surface three-dimensional 3d pro-file measurement alignment error error compensation
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基于LCD数字投影技术的傅里叶变换法测量物体三维形貌 被引量:18
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作者 孙平 张丽 陶春先 《光子学报》 EI CAS CSCD 北大核心 2005年第8期1250-1252,共3页
利用数字投影栅线技术,采集变形前后的两幅图像,存入计算机中,然后根据Fourier变换原理进行处理,解调出物体的形貌信息.整个过程自动化程度较高,尤其是投影栅线为正弦栅线且栅距随意可调,比栅板投影栅线所含噪音小,因此精确度较高,而且... 利用数字投影栅线技术,采集变形前后的两幅图像,存入计算机中,然后根据Fourier变换原理进行处理,解调出物体的形貌信息.整个过程自动化程度较高,尤其是投影栅线为正弦栅线且栅距随意可调,比栅板投影栅线所含噪音小,因此精确度较高,而且使用的仪器常见,对环境要求低,简便易行,有利于进一步推广.给出对爆竹像的实际测量结果,结果表明了该方法的实用价值. 展开更多
关键词 信息光学 三维形貌测量 图像处理 数字栅线技术 FOURIER变换
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Deep3DSketch-im:rapid high-fidelity AI 3D model generation by single freehand sketches 被引量:1
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作者 Tianrun CHEN Runlong CAO +2 位作者 Zejian LI Ying ZANG Lingyun SUN 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2024年第1期149-159,共11页
The rise of artificial intelligence generated content(AIGC)has been remarkable in the language and image fields,but artificial intelligence(AI)generated three-dimensional(3D)models are still under-explored due to thei... The rise of artificial intelligence generated content(AIGC)has been remarkable in the language and image fields,but artificial intelligence(AI)generated three-dimensional(3D)models are still under-explored due to their complex nature and lack of training data.The conventional approach of creating 3D content through computer-aided design(CAD)is labor-intensive and requires expertise,making it challenging for novice users.To address this issue,we propose a sketch-based 3D modeling approach,Deep3DSketch-im,which uses a single freehand sketch for modeling.This is a challenging task due to the sparsity and ambiguity.Deep3DSketch-im uses a novel data representation called the signed distance field(SDF)to improve the sketch-to-3D model process by incorporating an implicit continuous field instead of voxel or points,and a specially designed neural network that can capture point and local features.Extensive experiments are conducted to demonstrate the effectiveness of the approach,achieving state-of-the-art(SOTA)performance on both synthetic and real datasets.Additionally,users show more satisfaction with results generated by Deep3DSketch-im,as reported in a user study.We believe that Deep3DSketch-im has the potential to revolutionize the process of 3D modeling by providing an intuitive and easy-to-use solution for novice users. 展开更多
关键词 Content creation SKETCH three-dimensional(3d)modeling 3d reconstruction shape from X Artificial intelligence(AI)
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基于傅里叶变换去隔行图像的动态3维面形测量 被引量:5
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作者 曹森鹏 王伟锋 薛喜昌 《激光技术》 CAS CSCD 北大核心 2013年第6期736-741,共6页
为了解决动态面形测量中隔行扫描CCD相机记录动态物体表面变形条纹图像存在缺陷的问题,提出了傅里叶变换去隔行算法,即把隔行扫描CCD获取动态物体的错位模糊帧图像分成两个单场图像,分别对每一单场图像进行傅里叶变换去隔行处理,再利用... 为了解决动态面形测量中隔行扫描CCD相机记录动态物体表面变形条纹图像存在缺陷的问题,提出了傅里叶变换去隔行算法,即把隔行扫描CCD获取动态物体的错位模糊帧图像分成两个单场图像,分别对每一单场图像进行傅里叶变换去隔行处理,再利用条纹分析法重建对应时刻的3维面形。理论分析得出单场傅里叶变换去隔行图像与对应的准确满帧图像相同的结论。结果表明,该方法可以很好地恢复条纹和重建物体,且简单实用,可用于基于空间相位检测、相位测量轮廓术、傅里叶变换轮廓术等条纹分析方法的动态物体3维测量中。 展开更多
关键词 信息光学 动态测量 傅里叶变换 去隔行算法 隔行扫描CCd 3维面形重建
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基于小物体的LCD数字相移条纹投影轮廓测量 被引量:1
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作者 魏升 刘南生 +1 位作者 林浩亮 刘明友 《南昌大学学报(工科版)》 CAS 2007年第2期131-134,共4页
采用数字相移条纹投影技术,利用计算机生成具有高对比度和较高亮度、并有一定相差的正弦条纹,用数字投影仪将这些条纹图依次投射到被测物体表面,相位移动由软件控制,这一过程即实现了数字相移投影,避免了传统相移带来的各种误差.可以根... 采用数字相移条纹投影技术,利用计算机生成具有高对比度和较高亮度、并有一定相差的正弦条纹,用数字投影仪将这些条纹图依次投射到被测物体表面,相位移动由软件控制,这一过程即实现了数字相移投影,避免了传统相移带来的各种误差.可以根据不同尺寸的面形确定最优的投影条纹,使得系统适应性强,操作简单,并能得到较高的测量精度.实验证实可实现小物体面形自适应测量. 展开更多
关键词 数字相移 液晶投影 三维面形测量
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颜色编码正弦条纹实现孤立动态物体3维测量
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作者 王慧 白乐源 +1 位作者 麻珂 张启灿 《激光技术》 CAS CSCD 北大核心 2014年第3期297-301,共5页
采用常规条纹投影与相位分析方法,对动态物体,尤其是空间存在孤立区域、分布不连续的动态物体进行3维面形测量时,很难得到可靠的展开相位。为了解决这一问题,提出一种用颜色编码正弦条纹光栅投影测量的新方法。该方法使用二级编码的颜... 采用常规条纹投影与相位分析方法,对动态物体,尤其是空间存在孤立区域、分布不连续的动态物体进行3维面形测量时,很难得到可靠的展开相位。为了解决这一问题,提出一种用颜色编码正弦条纹光栅投影测量的新方法。该方法使用二级编码的颜色信息来标记待投影的正弦条纹,从另一角度拍摄记录带有颜色信息的变形条纹图,根据编码特征进行解码获取颜色级次来确定条纹级次,并指导截断相位的展开,重建空间孤立动态物体的3维面形数据。结果表明,该算法的编码稳定、解码方式可靠,只需要拍摄1幅图就可以较好地重建空间孤立物体的3维面形。 展开更多
关键词 傅里叶光学 3维面形测量 动态物体 颜色编码 孤立物体 正弦条纹 相位测量
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一种管道内3维形貌检测系统 被引量:2
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作者 戴欣冉 钱晓凡 +1 位作者 徐天杰 郎海涛 《激光技术》 CAS CSCD 北大核心 2016年第1期68-72,共5页
为了解决常见结构光管道内3维形貌检测系统存在光线遮挡引起测量误差和"盲区"的问题,采用了一种新改进的圆结构光垂直照明、用两个互补金属氧化物半导体摄像机同步拍摄的管道内3维形貌检测系统,建立了适合该系统的图像处理和... 为了解决常见结构光管道内3维形貌检测系统存在光线遮挡引起测量误差和"盲区"的问题,采用了一种新改进的圆结构光垂直照明、用两个互补金属氧化物半导体摄像机同步拍摄的管道内3维形貌检测系统,建立了适合该系统的图像处理和系统标定方法,完成了检测实验。结果表明,该系统可以很好地解决"盲区"问题,减小了测量误差,系统的标准差为0.50mm,并能得到完整的管道内壁3维形貌信息。 展开更多
关键词 测量与计量 3维形貌检测 圆结构光 系统标定
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条纹投影动态3维测量中相位高精度估计 被引量:3
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作者 闫乾宏 李勇 +3 位作者 江溢腾 黄凯 周星灿 陈晓鹏 《激光技术》 CAS CSCD 北大核心 2019年第5期619-623,共5页
为了提高条纹投影动态3-D形貌测量精度,采用加窗傅里叶分析辅助相移的方法来减小运动导致的相移误差。首先采用加窗傅里叶分析法估计变形条纹间的实际相移量,然后采用最小二乘法估计出变形条纹的高精度相位分布,最后由估计的相位计算得... 为了提高条纹投影动态3-D形貌测量精度,采用加窗傅里叶分析辅助相移的方法来减小运动导致的相移误差。首先采用加窗傅里叶分析法估计变形条纹间的实际相移量,然后采用最小二乘法估计出变形条纹的高精度相位分布,最后由估计的相位计算得到场景3维形貌。理论分析了物体运动对相移量的影响,通过仿真研究了所提方法的相移量估计精度,并搭建了实验系统进行验证。结果表明,实验中采用所提方法的相位恢复精度达到0.1673rad,比现有方法有明显提高。该方法用来提高条纹投影动态3-D形貌测量中相位精度是有效的。 展开更多
关键词 信息光学 动态3-d形貌测量 相位测量轮廓术 条纹分析 加窗傅里叶变换
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基于条纹反射的镜面测量及三维重建算法分析 被引量:16
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作者 荆海龙 苏显渝 +1 位作者 刘元坤 伍凡 《光电工程》 EI CAS CSCD 北大核心 2008年第10期37-42,共6页
本文详细介绍了依据条纹反射术测量镜面、类镜面的原理和方法,分析了经由梯度数据重建三维面形的主要算法和关键问题。通过计算机模拟和波面实际测量,对十字路径积分法、傅里叶变换积分法和区域波前重构法三种主要算法的重建精度进行了... 本文详细介绍了依据条纹反射术测量镜面、类镜面的原理和方法,分析了经由梯度数据重建三维面形的主要算法和关键问题。通过计算机模拟和波面实际测量,对十字路径积分法、傅里叶变换积分法和区域波前重构法三种主要算法的重建精度进行了对比研究。研究表明:区域波前重构法不但对高频噪声有较强的抑制作用,同时也可以处理复杂的连通区域和非等间距分布梯度数据的复杂情况,因此更适用于基于条纹反射术的波面测量。 展开更多
关键词 三维面形测量 条纹反射 镜面测量 梯度数据
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数字散斑相关方法用于牙冠形状的三维测量 被引量:23
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作者 张修银 杨宠莹 +1 位作者 高建新 丁祖泉 《上海口腔医学》 CAS CSCD 1997年第2期68-70,共3页
本文介绍了数字散斑相关方法用于牙冠形状的三维测量的过程。对于一个后牙牙冠的三维形状测量,我们首先测量该牙冠的五个面:颊面、舌面、近远中面、面,然后根据各测量面座标轴的相对位置关系,将五组局部数据转换到同一座标系中实现... 本文介绍了数字散斑相关方法用于牙冠形状的三维测量的过程。对于一个后牙牙冠的三维形状测量,我们首先测量该牙冠的五个面:颊面、舌面、近远中面、面,然后根据各测量面座标轴的相对位置关系,将五组局部数据转换到同一座标系中实现该牙冠的三维重建,并通过计算机绘图进行三维显示。该测量方法所获取的牙冠形状的三维数据为修复体CAD/CAM的实现奠定了数据基楚。本文还就该测量方法的特点、系统精度、三维重建中的数据结合方式、系统量程、可靠性等方面进行了讨论。 展开更多
关键词 数字散斑相关 牙冠形状 三维测量
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