When creating a multi-view 3D image with one camera, the camera has to be moved from one viewpoint to another viewpoint. It would take a long time and high cost, and it can not get the image of a moving object. In thi...
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When creating a multi-view 3D image with one camera, the camera has to be moved from one viewpoint to another viewpoint. It would take a long time and high cost, and it can not get the image of a moving object. In this paper, we proposed the method for capturing a multi-view 3D image by one step. In order to capture a multi-view image, the lenticular lens is used in our proposed system. The captured multi-view image became reverse when we use the lenticular lens, it needs to perform reversal processing, and it also needs to calculate the best observation distance. When displaying a multi-view image, 3D image is possible to display using the same lens. As an experiment result, we got the multi-view image by our proposal system. And when we laid the multi-view image under a lenticular lens, the multi-view 3D image was confirmed.
This paper describes the development of a virtual laboratory used as a self-based learning tool for control engineering education at undergraduate level. It relies on real time animation to emulate the operation and c...
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This paper describes the development of a virtual laboratory used as a self-based learning tool for control engineering education at undergraduate level. It relies on real time animation to emulate the operation and connectivity of the physical plant. Here, the real world laboratory plant is mimiced by a 3D-VRML (Virtual Reality Modeling Language) and Cortona automation interface. This provides a virtually interactive environment which allows users to freely manipulate the virtual plant as if they should be in the real world laboratory environment with the physical hardware.
This contribution presents a uniform framework and versatile data structure to simulate, program and control kinematics and other articulated mechanisms as integral part of a comprehensive 3D simulation and Virtual Re...
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ISBN:
(纸本)9789604742769
This contribution presents a uniform framework and versatile data structure to simulate, program and control kinematics and other articulated mechanisms as integral part of a comprehensive 3D simulation and Virtual Reality system. Such a system has demanding requirements regarding the interoperability of frameworks and data structures on which the performance and the capabilities of the applications depend. The basis of the system here is a scene graph based structure with the ability to augment its nodes with arbitrary data representing additional functional and structural information. This approach - though it utilizes a simple yet flexible graph at its core - is highly modular and versatile in representing a broad range of kinematic relations and allows for various applications in the field of simulation and VR. Currently, the uniform framework covers such diverse areas as forest harvesting processes, advanced production environments and mechanisms on the international Space Station.
This paper develops a control system for a drum-boiler unit, which employs a three element cascade control (water level, steam flow, feed-water) versus a single element control for the water level loop, in order to at...
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This paper develops a control system for a drum-boiler unit, which employs a three element cascade control (water level, steam flow, feed-water) versus a single element control for the water level loop, in order to attenuate the non-minimum phase shrink-and-swell effect. The overall control structure includes a heat flux control loop for throttle pressure stabilization. Gain scheduling technique is added to improve system responses at various operating points. The process is built around the Åström-Bell non-linear complex drum-boiler model fitted for a real 16 MW thermal power plant. The model is extended with actuators, super-heater and turbine dynamics. The implementation is carried out in Labview, employing a graphical user interface (GUI) for friendly man machine interaction with selection of manual/automatic mode. The simulation results are focused on manual/automatic control operation with satisfactory response behaviors.
In this paper the multichannel quantum cryptographic system is described. Data transmission speed and noise immunity are compared. Both fiber optic and free space optics communication systems application types are con...
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In this paper the multichannel quantum cryptographic system is described. Data transmission speed and noise immunity are compared. Both fiber optic and free space optics communication systems application types are considered.
3D reconstruction for freehand 3D ultrasound is a challenging issue because the recorded B-scans are not only sparse, but also non-parallel. Both conventional volume and surface reconstruction methods can39;t recons...
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3D reconstruction for freehand 3D ultrasound is a challenging issue because the recorded B-scans are not only sparse, but also non-parallel. Both conventional volume and surface reconstruction methods can't reconstruct sparse data efficiently while they are arbitrarily oriented in 3D space. We developed a new surface reconstruction method for freehand 3D ultrasound based on variational implicit function. In the new method, we first constructed on- & off-surface constraints from the segmented contours of all recorded Bscans, then used a variational interpolation technique to get a single implicit function in 3D. Finally, the implicit function was evaluated to extract the zerovalued surface as reconstruction result. One phantom experiment was conducted to assess our variational surface reconstruction method, and the experiment results have shown that the new method is capable of reconstructing surface smoothly from sparse contours which can be arbitrarily oriented in 3D space.
A sufficient amount of studies worldwide prove an interrelation linking students’learning productivity,emotional and psychological state to physiological *** states and the interest in learning affect learning produc...
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A sufficient amount of studies worldwide prove an interrelation linking students’learning productivity,emotional and psychological state to physiological *** states and the interest in learning affect learning productivity,while physiological parameters demonstrate such *** the research by the authors of the present article confirmed these interdependencies,a Recommender System to Analyse Student’s Learning Productivity(Recommender System hereafter)has been *** Recommender System uses the Maslow’s Hierarchy of Needs and the database of the best global practices to come up with recommendations for students how to improve their learning *** research includes various scientists who conducted in-depth studies on the different and very important areas in the *** did not find any systems which would take physiological parameters of students,analyse their learning efficiency and,in turn,provide recommendations.
Grasping a deformable object instantaneously requires maintaining equilibrium of its pre- and post-deformed shapes using the same set of forces. This paper studies the type of grasps generated by squeezing a planar ob...
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Grasping a deformable object instantaneously requires maintaining equilibrium of its pre- and post-deformed shapes using the same set of forces. This paper studies the type of grasps generated by squeezing a planar object with two fingers. It is shown that the success of such a grasp is independent of the applied forces in the case of small deformation. Numerical algorithms are introduced to compute sets of squeeze grasps with small and large deformations modeled using the finite element method (FEM) based on the linear and nonlinear elasticity theories, respectively.
Direct Torque control (DTC) is a well known control method, which is used to control the flux and torque of a motor. This method uses a flux and torque estimator and two hysteresis controllers. The main drawbacks of D...
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Direct Torque control (DTC) is a well known control method, which is used to control the flux and torque of a motor. This method uses a flux and torque estimator and two hysteresis controllers. The main drawbacks of DTC are high torque and flux ripple. To overcome these problems, a DTC-SVPWM method is used which decreases the torque and flux ripple considerably. The stator resistance is used in the flux and torque estimator for both DTC and DTC-SVPWM. So the stator resistance deviation from its set value, might affect DTC-SVPWM performance. In this paper a proposed fuzzy stator resistance estimator is used for DTC-SVPWM controller, which improved controller performance.
Real-Time tracking of elliptical objects, e.g. a ball, is a well studied field. However, the question between a monocular and binocular approach for 3D objects localization is still an open issue. In this work we impl...
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ISBN:
(纸本)9789898425751
Real-Time tracking of elliptical objects, e.g. a ball, is a well studied field. However, the question between a monocular and binocular approach for 3D objects localization is still an open issue. In this work we implemented a real-time algorithm for 3D ball localization and tracking from 2D image ellipse fitting with calibrated cameras. We will exploit both approaches, together with their own characteristics. Our algorithm features the following key features: (1) a real-time video segmentation by means of a Gaussian mixture descriptor;(2) a closed-form ellipse fitting algorithm;and (3) a novel 3D reconstruction algorithm for spheres from the 2D ellipse parameters. We test the algorithm's performance in several conditions, by performing experiments in virtual scenarios with ground truth. Finally, we show the results of monocular and binocular reconstructions and evaluate the influence of having prior knowledge of the ball's dimension and the sensitivity of binocular reconstruction to mechanical calibration errors.
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