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"affiliation": "Southern University of Science and Technology",
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"abstract": "This study presents the indoor automated guided vehicles (AGV) laser navigation method on under-determined environments. Typical laser navigation system working well based on at least three reflectors. However, for the complex environment, dependent on obstacles shelves and goods, it is hard to install reflectors in expected points result in the laser scanner probably receive reflecting signal from less than three reflectors. This under-determined positioning condition will lead to the abnormal work situation of laser navigation system. In order to figure out it, this paper presents a new method when the number is less than three reflectors to output expected location information. It combines the known roadmap with two-axis accelerometer for different observation condition when the number of available reflectors is less than three. The scheme showed that the output accuracy is better than 8cm at the worst and more robust than single laser navigation system.",
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{
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"content": "This study presents the indoor automated guided vehicles (AGV) laser navigation method on under-determined environments. Typical laser navigation system working well based on at least three reflectors. However, for the complex environment, dependent on obstacles shelves and goods, it is hard to install reflectors in expected points result in the laser scanner probably receive reflecting signal from less than three reflectors. This under-determined positioning condition will lead to the abnormal work situation of laser navigation system. In order to figure out it, this paper presents a new method when the number is less than three reflectors to output expected location information. It combines the known roadmap with two-axis accelerometer for different observation condition when the number of available reflectors is less than three. The scheme showed that the output accuracy is better than 8cm at the worst and more robust than single laser navigation system.",
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"abstract": "The mechanical properties of micron and nanometer scale thin films have become an important issues in modern microelectronics. Here, two recent development of using optical methods to measure the mechanical properties of thin films were introduced. First, a paddle-like cantilever beam test structure with nanometer scale metal films on top was design and developed. Film strain and stresses of different thicknesses were measured through the beam deflection obtained by using a four-step phase-shifting process with a Michelson interferometer. Second, we introduce the XRD measurements of the bulge tested thin film. We annealed thin Ag films and tracked the texture transformation in-situ using synchrotron x-ray diffraction while independently varying the stress in the film using a bulge test apparatus. The bulge height was measured as a function of pressure using a simple Fabry-Perot optical interferometer, using the bulge as the fully reflective surface, and an optically flat half-silvered mirror as a reference surface. A CCD camera was used to record interference fringe motion as the pressure was increased. The bulge height was obtained by counting the number of fringes that passed a given point. A laser light source with a 532 nm wavelength gave a height resolution of 266 nm.",
"abstracts": [
{
"abstractType": "Regular",
"content": "The mechanical properties of micron and nanometer scale thin films have become an important issues in modern microelectronics. Here, two recent development of using optical methods to measure the mechanical properties of thin films were introduced. First, a paddle-like cantilever beam test structure with nanometer scale metal films on top was design and developed. Film strain and stresses of different thicknesses were measured through the beam deflection obtained by using a four-step phase-shifting process with a Michelson interferometer. Second, we introduce the XRD measurements of the bulge tested thin film. We annealed thin Ag films and tracked the texture transformation in-situ using synchrotron x-ray diffraction while independently varying the stress in the film using a bulge test apparatus. The bulge height was measured as a function of pressure using a simple Fabry-Perot optical interferometer, using the bulge as the fully reflective surface, and an optically flat half-silvered mirror as a reference surface. A CCD camera was used to record interference fringe motion as the pressure was increased. The bulge height was obtained by counting the number of fringes that passed a given point. A laser light source with a 532 nm wavelength gave a height resolution of 266 nm.",
"__typename": "ArticleAbstractType"
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],
"normalizedAbstract": "The mechanical properties of micron and nanometer scale thin films have become an important issues in modern microelectronics. Here, two recent development of using optical methods to measure the mechanical properties of thin films were introduced. First, a paddle-like cantilever beam test structure with nanometer scale metal films on top was design and developed. Film strain and stresses of different thicknesses were measured through the beam deflection obtained by using a four-step phase-shifting process with a Michelson interferometer. Second, we introduce the XRD measurements of the bulge tested thin film. We annealed thin Ag films and tracked the texture transformation in-situ using synchrotron x-ray diffraction while independently varying the stress in the film using a bulge test apparatus. The bulge height was measured as a function of pressure using a simple Fabry-Perot optical interferometer, using the bulge as the fully reflective surface, and an optically flat half-silvered mirror as a reference surface. A CCD camera was used to record interference fringe motion as the pressure was increased. The bulge height was obtained by counting the number of fringes that passed a given point. A laser light source with a 532 nm wavelength gave a height resolution of 266 nm.",
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"abstract": "A co-located projector camera system where the projector and camera are positioned in the same optical position by a plate beam splitter enables various spatial augmented reality applications for dynamic three dimensional scenes. The extremely precise alignment of the projection centers of the camera and projector is necessary for these applications. However, the conventional calibration procedure for a camera and projector cannot achieve high accuracy because an iterative verification process for the alignment is not included. This paper proposes a novel interactive alignment approach that displays a capture of the projected grid pattern on the calibration screen. Additionally, a misalignment display technique that employs projector camera feedback is proposed for fine adjustment.",
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"abstract": "An opto-piezoelectric laminate composed of a photosensitive electrode and a PZT (Lead Zirconate Titanate) layer modulated by a light field was adopted as the research platform of this paper. The photosensitive electrode is a thin film formed by mixing TiOPc (Titanium oxide phthalocyanine) and a copolymer. During operation, the instant variation of TiOPc impedance when illuminated with light beam patterns created spatially varying electric field across the piezoelectric actuator made of PZT. The processes used to create this opto-piezoelectric composite and its application to acoustics are discussed in this paper. For example, it was known that the low-frequency performance of flat piezoelectric loudspeakers is poor. By taking advantages of the characteristic of the photoelectric conductive electrode, which demonstrated noticeable impedance change at low-mid range frequency (about 40-8000Hz), a way to enhance the low-frequency performance of the flat piezoelectric speakers are examined. Various illumination pattern tried and examined to control the acoustic beam patterns created are also presented. The experimental results confirmed the directivity controlling capability of acoustic pressure generated through external illuminated light patterns by using the opto-piezoelectric platform are detailed as well.",
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"content": "An opto-piezoelectric laminate composed of a photosensitive electrode and a PZT (Lead Zirconate Titanate) layer modulated by a light field was adopted as the research platform of this paper. The photosensitive electrode is a thin film formed by mixing TiOPc (Titanium oxide phthalocyanine) and a copolymer. During operation, the instant variation of TiOPc impedance when illuminated with light beam patterns created spatially varying electric field across the piezoelectric actuator made of PZT. The processes used to create this opto-piezoelectric composite and its application to acoustics are discussed in this paper. For example, it was known that the low-frequency performance of flat piezoelectric loudspeakers is poor. By taking advantages of the characteristic of the photoelectric conductive electrode, which demonstrated noticeable impedance change at low-mid range frequency (about 40-8000Hz), a way to enhance the low-frequency performance of the flat piezoelectric speakers are examined. Various illumination pattern tried and examined to control the acoustic beam patterns created are also presented. The experimental results confirmed the directivity controlling capability of acoustic pressure generated through external illuminated light patterns by using the opto-piezoelectric platform are detailed as well.",
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"normalizedAbstract": "An opto-piezoelectric laminate composed of a photosensitive electrode and a PZT (Lead Zirconate Titanate) layer modulated by a light field was adopted as the research platform of this paper. The photosensitive electrode is a thin film formed by mixing TiOPc (Titanium oxide phthalocyanine) and a copolymer. During operation, the instant variation of TiOPc impedance when illuminated with light beam patterns created spatially varying electric field across the piezoelectric actuator made of PZT. The processes used to create this opto-piezoelectric composite and its application to acoustics are discussed in this paper. For example, it was known that the low-frequency performance of flat piezoelectric loudspeakers is poor. By taking advantages of the characteristic of the photoelectric conductive electrode, which demonstrated noticeable impedance change at low-mid range frequency (about 40-8000Hz), a way to enhance the low-frequency performance of the flat piezoelectric speakers are examined. Various illumination pattern tried and examined to control the acoustic beam patterns created are also presented. The experimental results confirmed the directivity controlling capability of acoustic pressure generated through external illuminated light patterns by using the opto-piezoelectric platform are detailed as well.",
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"Laser",
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"Grating Fringe",
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"authors": [
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"affiliation": "Tianjin University of Science & Technology",
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{
"affiliation": "Tianjin University of Science & Technology",
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"title": "Study on spherical aberration in the laser optical system",
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"abstract": "The effect of spherical aberration on the radius of image beam waist in the design of laser optical system is discussed in detail, and the relationship between the spherical aberration and the image beam waist radius in the laser optical system is deduced. Radius variation of image beam waist due to spherical aberration which varies with the position of object beam waist and the optical system focus is analyzed by the form of curve. The analysis results indicate that the effect of spherical aberration on the radius of image beam waist should be considered according to the position of object beam waist in the design of a laser optical system. Finally, a design example of the optical system used for atmospheric laser communication system is given to illustrate the effect of spherical aberration on the image beam waist.",
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"content": "The effect of spherical aberration on the radius of image beam waist in the design of laser optical system is discussed in detail, and the relationship between the spherical aberration and the image beam waist radius in the laser optical system is deduced. Radius variation of image beam waist due to spherical aberration which varies with the position of object beam waist and the optical system focus is analyzed by the form of curve. The analysis results indicate that the effect of spherical aberration on the radius of image beam waist should be considered according to the position of object beam waist in the design of a laser optical system. Finally, a design example of the optical system used for atmospheric laser communication system is given to illustrate the effect of spherical aberration on the image beam waist.",
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"normalizedAbstract": "The effect of spherical aberration on the radius of image beam waist in the design of laser optical system is discussed in detail, and the relationship between the spherical aberration and the image beam waist radius in the laser optical system is deduced. Radius variation of image beam waist due to spherical aberration which varies with the position of object beam waist and the optical system focus is analyzed by the form of curve. The analysis results indicate that the effect of spherical aberration on the radius of image beam waist should be considered according to the position of object beam waist in the design of a laser optical system. Finally, a design example of the optical system used for atmospheric laser communication system is given to illustrate the effect of spherical aberration on the image beam waist.",
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"keywords": [
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"Geometrical Optics",
"Laser Optical System Design",
"Spherical Aberration",
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"authors": [
{
"affiliation": "Army Engineering University of PLA,Ordnance N.C.O Academy,Wuhan,China,430075",
"fullName": "Heng Jiang",
"givenName": "Heng",
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"affiliation": "Army Engineering University of PLA,Ordnance N.C.O Academy,Wuhan,China,430075",
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"affiliation": "Army Engineering University of PLA,Ordnance N.C.O Academy,Wuhan,China,430075",
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"content": "In this paper we address the problem of geometric calibration of video projectors. Like in most previous methods we also use a camera that observes the projection on a planar surface. Contrary to those previous methods, we neither require the camera to be calibrated nor the presence of a calibration grid or other metric information about the scene. We thus speak of geometric auto-calibration of projectors (GAP). The fact that camera calibration is not needed increases the usability of the method and at the same time eliminates one potential source of inaccuracy, since errors in the camera calibration would otherwise inevitably propagate through to the projector calibration. Our method enjoys a good stability and gives good results when compared against existing methods as depicted by our experiments.",
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"abstract": "Self-calibration is one of the most active issues concerning vision-based 3D measurements. However, in the case of the light sectioning method, there has been little research conducted on self-calibration techniques. In this paper, we study the problem of self-calibration for an active vision system which uses line lasers and a single camera. The problem can be defined as the estimation of multiple laser planes from the curves of laser reflections observed from a sequence of images captured by a single camera. The constraints of the problem can be obtained from observed intersection points between the curves. In this condition, the problem is formulated as simultaneous polynomial equations, in which the number of equations is larger than the number of variables. Approximated solutions of the equations can be computed by using Grobner bases. By refining them using nonlinear optimization, the final result can be obtained. We developed an actual 3D measurement system using the proposed method, which consists of only a laser projector with two line lasers and a single camera. Users are just required to move the projector freely so that the projected lines sweep across the surface of the scene to get the 3D shape.",
"abstracts": [
{
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"content": "Self-calibration is one of the most active issues concerning vision-based 3D measurements. However, in the case of the light sectioning method, there has been little research conducted on self-calibration techniques. In this paper, we study the problem of self-calibration for an active vision system which uses line lasers and a single camera. The problem can be defined as the estimation of multiple laser planes from the curves of laser reflections observed from a sequence of images captured by a single camera. The constraints of the problem can be obtained from observed intersection points between the curves. In this condition, the problem is formulated as simultaneous polynomial equations, in which the number of equations is larger than the number of variables. Approximated solutions of the equations can be computed by using Grobner bases. By refining them using nonlinear optimization, the final result can be obtained. We developed an actual 3D measurement system using the proposed method, which consists of only a laser projector with two line lasers and a single camera. Users are just required to move the projector freely so that the projected lines sweep across the surface of the scene to get the 3D shape.",
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"content": "We present a system that employs a custom-built pan-tilt-zoom camera for laser pointer tracking in arbitrary real environments. Once placed in a room, it carries out a fully automatic self-registration, registrations of projectors, and sampling of surface parameters, such as geometry and reflectivity. After these steps, it can be used for tracking a laser spot on the surface as well as an LED marker in 3D space, using inter-playing fish-eye context and controllable detail cameras. The captured surface information can be used for masking out areas that are problematic for laser pointer tracking, and for guiding geometric and radiometric image correction techniques that enable a projector-based augmentation on arbitrary surfaces. We describe a distributed software framework that couples laser pointer tracking for interaction, projector-based AR as well as video see-through AR for visualizations, with the domain specific functionality of existing desktop tools for architectural planning, simulation and building surveying.",
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"abstract": "Non-rigid object tracking is an important yet challenging task in computer vision. In this paper, a multi-patch neural network (MPNet) model is presented to address the problem of non-rigid object tracking. The model learns a multiple patch based framework, which mainly consists of two branches of neural networks. One branch is to track the global target and the other branch partitions the target into multiple patches which are tracked separately. The global tracking and the multiple patch tracking are combined to compute the final tracking results. Compared with the existing methods, our model exploits the trajectories of various parts of a non-rigid object and therefore can accurately track the non-rigid object. Experiments on visual tracking datasets prove the strength of the proposed method.",
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"affiliation": "Xi’an Jiaotong University, Xi’an, China",
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"title": "Neural Deformation Graphs for Globally-consistent Non-rigid Reconstruction",
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"content": "We introduce Neural Deformation Graphs for globally-consistent deformation tracking and 3D reconstruction of non-rigid objects. Specifically, we implicitly model a deformation graph via a deep neural network. This neural deformation graph does not rely on any object-specific structure and, thus, can be applied to general non-rigid deformation tracking. Our method globally optimizes this neural graph on a given sequence of depth camera observations of a non-rigidly moving object. Based on explicit viewpoint consistency as well as inter-frame graph and surface consistency constraints, the underlying network is trained in a self-supervised fashion. We additionally optimize for the geometry of the object with an implicit deformable multi-MLP shape representation. Our approach does not assume sequential input data, thus enabling robust tracking of fast motions or even temporally disconnected recordings. Our experiments demonstrate that our Neural Deformation Graphs outperform state-of-the-art non-rigid reconstruction approaches both qualitatively and quantitatively, with 64% improved reconstruction and 54% improved deformation tracking performance. Code is publicly available.<sup>1</sup>",
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"abstract": "In order to solve the problem of inconsistent color appearance between different views, and subsequently influences on multi-view video coding, a color correction algorithm of multi-view video based on depth segmentation is proposed in this paper. Firstly, depth information in each view is calculated. Then, background and foreground region are separated with the depth information. Finally, correction factors are achieved and color correction is used for the two regions respectively. Moreover, the boundary between the background and foreground has been treated with color gradual change. Experimental results show that the proposed algorithm can obtain consistent color appearance for different views and high coding efficiency. It is an effective method of color correction.",
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"abstract": "Digital camera is one of the main devices in computer and multimedia technology and its color management model is the key to guarantee color consistency in succedent image production and transfers. The paper presents a color conversion model for digital camera based on polynomial curve generation. Firstly, color rendering principle of digital camera is analyzed. Then digital camera data is pretreated to a unitary field to deduce final model. Thirdly, standard color target is taken for experimental sample and substitutes color blocks in color shade district for complete color space to solve the difficulties of experimental color blocks selecting; Fourthly, the model using polynomial curve generation algorithm to correct color error is deduced; Finally, the realization and experiment results show that, compared with some methods which have relatively high accuracy, the algorithm can improve color conversion accuracy and can satisfy the engineering requirement in digital camera color management .",
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"abstract": "The key issue for parallel cluster computing is the stability of load balancing method, the unstable behavior such as oscillatory action which caused by delay can intensely influence the performance of load balancing algorithm. In such a case, a linear dynamic load balancing model is proposed in this paper. By analyzing the stability of this linear model, we can not only obtain the relation between delay and load balancing gain, but also find the affect between stability and scalability of system. Based on the linear model, a more actual nonlinear model is introduced in the end. Simulation results are presented and compared with analyzing results and other load balancing methods.",
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