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Articles 4351 - 4380 of 23583
Full-Text Articles in Computer Engineering
Zenithal Pedestrian Detection Using Multiple Feature Fusion In Monocular Vision, Chunhui Tang
Zenithal Pedestrian Detection Using Multiple Feature Fusion In Monocular Vision, Chunhui Tang
Journal of System Simulation
Abstract: There were extensive literatures on pedestrian detection, mostly supposed that visible humans were observed in flat view. Sometimes pedestrian detection from another perspective should be considered. The pedestrian detection with a vertical view camera was taken into account, which was usually used to count the pedestrian number. A method is put forward for zenithal pedestrian detecting based on rectangular partition features, in which the pedestrian head detection takes place of the body detection. It is by the exhaustive scanning to find targets in an image and so all the candidates are put into a series of rectangular feature …
Terramechanics And Machine Learning For The Characterization Of Terrain, Bryan W. Southwell
Terramechanics And Machine Learning For The Characterization Of Terrain, Bryan W. Southwell
Electronic Thesis and Dissertation Repository
An instrumented rover wheel can collect vast amounts of data about a planetary surface. Planetary surfaces are changed by complex geological processes which can be better understood with an abundance of surface data and the use of terramechanics. Identifying terrain parameters such as cohesion and angle of friction hold importance for both the rover driver and the planetary scientist. Knowledge of terrain characteristics can warn of unsafe terrain and flag potential interesting scientific sites. The instrumented wheel in this research utilizes a pressure pad to sense load and sinkage, a string potentiometer to measure slip, and records motor current draw. …
Numerical Analyses And Research Of Lc And Rc Filter Circuits For Nonperiodic Signal, Zhou Jing, Jianbin Zhou, Hong Xu, Yingjie Ma, Wang Min, Zhou Wei
Numerical Analyses And Research Of Lc And Rc Filter Circuits For Nonperiodic Signal, Zhou Jing, Jianbin Zhou, Hong Xu, Yingjie Ma, Wang Min, Zhou Wei
Journal of System Simulation
Abstract: With a numerical method, LC and RC filter circuits were used to the nonperiodic signal filtering analyses in DC power output voltage. By applying the method of numerical solution of differential equation, the numerical recursive solution of circuit differential equations could be obtained, thus, numerical models of circuits could be established. The numerical models could be used to the quantitative analysis of nonperiodic signal. The defects of LC and RC filter circuits in DC power output voltage filtering were indicated, LRC filter circuit was introduced, and numerical simulation results show that this circuit can overcome the defects of LC …
Modeling And Simulation Of Offshore Support Vessel Anchoring Operation, Hongbo Sun, Chaojian Shi, Wenjin Lin
Modeling And Simulation Of Offshore Support Vessel Anchoring Operation, Hongbo Sun, Chaojian Shi, Wenjin Lin
Journal of System Simulation
Abstract: In order to understand the configurations of mooring line and working wire, tension variation at release point of working wire and the influence of the offshore support vessel during anchoring operation, a mathematical models of OSV anchoring operation was established. According to the MMG (Ship Manoeuvring Mathematical Model Group) ship motion mathematical modeling theory, a 6dof ship motion mathematical model was built. And a 6dof cable motion mathematical model was established with finite difference method. A coupling ship-cable-anchor-cable system model was established. The system motion simulations were carried out, and the results indicate that the model …
Virtual Reality In Transportation: A Survey, Zhaohui Wu, Guo Yu, Wang Hui, Xiuna Miao
Virtual Reality In Transportation: A Survey, Zhaohui Wu, Guo Yu, Wang Hui, Xiuna Miao
Journal of System Simulation
Abstract: The state-of-the-art of virtual reality application in the field of transportation was focused on. The novel virtual reality applications were summarized from the following six aspects: traffic simulation, accident simulation, virtual driving system, transportation achievements exhibition, behavior and psychology of traffic, virtual design and maintenance, and so on. The existing problems were discussed in the virtual reality application of transportation. The trends of virtual reality were proposed to try to solve the real traffic problems based on the transportation status of China.
Aesthetic Assessment For Digital Portrait Photos, Zeen Tao, Yuanyuan Pu, Xu Dan, Yiwei Liu
Aesthetic Assessment For Digital Portrait Photos, Zeen Tao, Yuanyuan Pu, Xu Dan, Yiwei Liu
Journal of System Simulation
Abstract: Computational aesthetic evaluation is a challenging research. With the widespread use of digital products, it needs to improve the intelligence of digital products. How are these photos judged good or bad? The traditional photo aesthetic quality evaluation mainly is done based on subjective judgment or experts or the photographer's understanding for beauty. It is not only slow, but also with highly subjective. The results of face detect and eye detect were used to calculate visual balance of digital portrait based on face proportion and other features for aesthetic assessment of digital portrait photo were extracted too. The computer aesthetic …
Regional Credible Fusion Based Color-Texture Image Segmentation Approach, Yang Yong, Guo Ling, Wenzheng Dai, Yangdong Ye
Regional Credible Fusion Based Color-Texture Image Segmentation Approach, Yang Yong, Guo Ling, Wenzheng Dai, Yangdong Ye
Journal of System Simulation
Abstract: An approach is proposed based on the combined color information and texture information for color-texture image segmentation. The compacted multi-scale texture information is extracted by using singular value decomposition and principal component analysis dimension reduction under decomposing the multi-scale structure tensor, and then it is integrated with scale information and color information for improving the description ability to color-texture. To avoid the phenomenon such as over-segmentation and error segmentation appeared, the regional credible fusion degree is computed by combining four kinds of region information, such as region adjacency relationship, region size, common edge between regions, and J-divergence distance. Meanwhile, …
Multi-Agent Path Planning Maco Algorithm In Web3d Mountain Scene, Fengting Yan, Jinyuan Jia
Multi-Agent Path Planning Maco Algorithm In Web3d Mountain Scene, Fengting Yan, Jinyuan Jia
Journal of System Simulation
Abstract: There is amount of data in a mountain scene, and the path planning algorithm in it is very complex, so it is not impossible to be shown detailed in Web. Usually the common potential path planning using contours can not find an optimal path because the path is easily cut under the cliff. To solve the above problems, a mACO (mountain ACO) path planning algorithm was addressed for the Web3D application, a planar grid ACO path planning algorithm and a A* path planning were completed in Web3D environment. Then a typical battle scene case was used for the …
Virtual Viewpoint Synthesis Based On Grid Mapping, Yao Li, Qiongying Wu, Xu Hui
Virtual Viewpoint Synthesis Based On Grid Mapping, Yao Li, Qiongying Wu, Xu Hui
Journal of System Simulation
Abstract: Due to imperfect depth maps, occlusion and the illumination difference between reference images, annoying artifacts, such as holes and ghost edges, appearing in the rendering image by DIBR, holes filling being time-consuming, triangle mesh based on the depth contour and maps mesh triangles with energy constrains were created. Image fusion algorithm merged different viewpoint images and got final virtual viewpoint image. While DIBR warped the image with pixels, triangles were mapped with. Compared with the traditional DIBR, the proposed algorithm has a faster processing speed than the traditional pixel based processing method in the same image quality.
Algorithm For Rgbd Point Cloud Denoising And Simplification Based On K-Means Clustering, Benyue Su, Jinyu Ma, Yusheng Peng, Sheng Min
Algorithm For Rgbd Point Cloud Denoising And Simplification Based On K-Means Clustering, Benyue Su, Jinyu Ma, Yusheng Peng, Sheng Min
Journal of System Simulation
Abstract: Aiming at the problem that the point cloud data scanned by Kinect or other depth camera have a huge number and more noise, a feature preserving method for point cloud denoising and simplification was proposed. This algorithm classified the point cloud rapidly by K-D tree; find The corresponding surface curvature values were obtained using curvature estimation algorithm; The K-means clustering algorithm for point cloud clustering was used. For each point in the cluster, the Euclidean distance was depended on between the point and center of the cluster and the change of the near points curvature to determine whether …
3d Skull Surface Completion Method Based On Multi-Exemplars, Reziwanguli Xiamixiding, Guohua Geng, Gulisong Nasierding, Qingqiong Deng, Dilinuer Keyimu, Zulipiya Maimaitiming, Wanrong Zhao, Zheng Lei
3d Skull Surface Completion Method Based On Multi-Exemplars, Reziwanguli Xiamixiding, Guohua Geng, Gulisong Nasierding, Qingqiong Deng, Dilinuer Keyimu, Zulipiya Maimaitiming, Wanrong Zhao, Zheng Lei
Journal of System Simulation
Abstract: In order to repair the damaged skulls, a skull completion method based on multiple exemplars was proposed. A 3D skull model database was constructed, and all the exemplars within the database were registered with a standard skull model. Each exemplar was then divided into a missing part and a remaining part according to the given damaged skull. After that, the relationship between the missing part and the remaining part was obtained by a regression algorithm. This relationship was used to calculate the missing part of the given skull, and a complete skull could be obtained by merging the two …
Mono-Slam Based Method For Stitching Images Of Sequence From Uav, Yuelong Ma, Zhao Yong, Xuefeng Cao
Mono-Slam Based Method For Stitching Images Of Sequence From Uav, Yuelong Ma, Zhao Yong, Xuefeng Cao
Journal of System Simulation
Abstract: It is an effective method to generate orthoimage from image sequence obtained from UAV. Most of the SfM-based methods for generating orthoimage are expensive computation and need hours or more to process image sequence, but the orthoimages generated finally are not satisfactory most of the time. An algorithm to stitch image sequence obtained from UAV incrementally was designed based on monocular SLAM generating orthoimage for large-scale instantaneously. Through the flow of SLAM, the system could estimate the position and attitude of the camera and the trajectory of UAV, meanwhile, generate a map of 3D point cloud. With the …
Study On Irregular Projection Surface Depth Perception Geometric Correction, Baoxing Bai, Yang Fan, Han Cheng, Zhang Chao
Study On Irregular Projection Surface Depth Perception Geometric Correction, Baoxing Bai, Yang Fan, Han Cheng, Zhang Chao
Journal of System Simulation
Abstract: In order to improve the universality of the projector projection scene, a method of depth perception geometric correction on the irregular projection surface was proposed. With the theoretical analysis of the coupling, the weaken coupling solution was proposed. The depth of the irregular projection surface could be acquired by the encoded color structured light. After that, the feedback was used to solve the maximum visual projection area, the dynamic slicing algorithm for the irregular surfaces depth information was used to pull away the stratification planes, so a corresponding homography matrix for each stratification plane was calculated and the homography …
Evaluation Method For Interior Layout Based On Voronoi Diagram, Milan Liu, Jiang Hao, Tianlu Mao, Zhaoqi Wang
Evaluation Method For Interior Layout Based On Voronoi Diagram, Milan Liu, Jiang Hao, Tianlu Mao, Zhaoqi Wang
Journal of System Simulation
Abstract: Three-dimensional interior model can be used to guide the indoor objects layout in real life. It is hard to evaluate an interior layout by a precise data because of the polymorphism and fuzzy of the evaluation problem of interior layout itself. In order to evaluate an interior layout objectively from the user’s view, an evaluation method for interior layout was proposed based on Voronoi Diagram. This method combined the knowledge of interior design and robot path planning, and generated moving lines in the scene by Voronoi Diagram. It could evaluate the interior layout objectively from aspects of patency, smoothness …
Multi-View Feature Learning Based On User Contributed Tag, Tian Feng, Fuhua Shang, Zhuoxuan Liu, Xukun Shen
Multi-View Feature Learning Based On User Contributed Tag, Tian Feng, Fuhua Shang, Zhuoxuan Liu, Xukun Shen
Journal of System Simulation
Abstract: A multi-view feature learning method based on user contributed tag was proposed. Bag-of-words representation for content feature and textual feature was learned. A multi-view feature learning framework was proposed to explicitly model the relevance between multimedia object and tags by learning a linear mapping from textual representation to visual representation. The learned feature encoded the information conveyed by original feature, and inner products of leaned features were preserved with a high probability with visual features and textual features. The complexity of the method is linear with respect to the size of dataset. Furthermore, the method can be extended …
Spatial Cues Gradient In Time Domain Based Audio Attention Computational Model, Hang Bo, Wang Yi, Changqing Kang, Huang Jian
Spatial Cues Gradient In Time Domain Based Audio Attention Computational Model, Hang Bo, Wang Yi, Changqing Kang, Huang Jian
Journal of System Simulation
Abstract: In virtual reality audio, sound source whose directions change rapidly should have higher attention level. But present bottom-up audio attention computational models extract the underlying characteristics of single channel audio such as energy, pitch, zero crossing rate etc., which can not effectively express the audio attention caused by such signals. To solve this problem, based on the psychological principles that spatial information affects attention, a model was proposed to introduce the short-term spatial gradient cues to measure the attention caused by the single audio source space direction changing. Compared to the traditional audio attention computational model, the recall of …
360-Degree Virtual Fitting Based On Kinect, Xiaoli Zhang, Junfeng Yao, Huang Ping
360-Degree Virtual Fitting Based On Kinect, Xiaoli Zhang, Junfeng Yao, Huang Ping
Journal of System Simulation
Abstract: A lot of virtual fitting systems only study human-computer interaction and clothing simulation, but they can’t make clothes model to rotate 360 degree along with human. To solve this problem, an improved method of virtual fitting based on Kinect using motion prediction was proposed. With the help of Kinect, the skeleton feature points of user for real-time tracking were obtained. According to the obtained information of the joint point of the head and color image, face was detected and judging the front or back of the user. The motion trajectory of the left and right shoulders’ joint points based …
Visualization Of 2d Dynamic Vector Fields Based On Topology Analysis, Li Chao, Lingda Wu, Bin Zhao
Visualization Of 2d Dynamic Vector Fields Based On Topology Analysis, Li Chao, Lingda Wu, Bin Zhao
Journal of System Simulation
Abstract: Flow is one of the most fundamental phenomenon in natural world. Flow visualization can give an intuitive view of flow fields and contribute to the observation and analysis of flow. Real flow fields are all dynamic while traditional visualization approaches are not able to reflect the trends of flows or the diversity inside them. Based on the research of Lagrangian Coherent Structures in Computational Fluid Dynamics, the concept of flow field topology was redefined, two typical 2D dynamic vector fields were selected for topology analysis, and the results were used to optimize the visual effects of geometric visualization. Experiments …
Graphics-Driver-Awared Heterogeneous Hardware-Accelerated Rendering Model, Zhiwei Ai, Cao Yi, Xiao Li, Huawei Wang
Graphics-Driver-Awared Heterogeneous Hardware-Accelerated Rendering Model, Zhiwei Ai, Cao Yi, Xiao Li, Huawei Wang
Journal of System Simulation
Abstract: As 3D graphics acceleration hardware technologies become more sophisticated, heterogeneous hardware-accelerated rendering model is one of effective means to improve interactive performance of large-scale data visualization. A graphics-driver-awared heterogeneous hardware-accelerated rendering model was proposed, and adaptive matching graphics architecture and graphics driver library in complex environment-improved the interactive performance of graphics rendering. Key technologies include runtime virtual layer technology, redundant graphics driver pool, running IntelliSense methods and graphics driver library dynamic loading technology. In practical application of visual analysis of nuclear reactor average flux, interactive performance of heterogeneous hardware rendering model available about 14 times speedup, has a …
Quadratic Rational Trigonometric Spline Curves With Shape Controlling, Xinru Liu, Manman Wei, Shengjun Liu, Dangfu Yang
Quadratic Rational Trigonometric Spline Curves With Shape Controlling, Xinru Liu, Manman Wei, Shengjun Liu, Dangfu Yang
Journal of System Simulation
Abstract: A new quadratic rational trigonometric spline curve with a shape parameter was proposed. The value control and the inflection-point control of the interpolation scheme were discussed in theory. And the optimal methods for calculating the desired inflection-points was proposed, by using optimization theory. Numerical experiments show the interpolation spline and the optimization method can be used in modeling design.
High-Level Descriptive Simulation Model For Underwater Virtual Maintenance, Lianen Ji, Ruisheng Sun, Luan Qi
High-Level Descriptive Simulation Model For Underwater Virtual Maintenance, Lianen Ji, Ruisheng Sun, Luan Qi
Journal of System Simulation
Abstract: The virtual simulation of underwater maintenance for oil and gas production involves a variety of maintenance processes and training cases. However, the existing modeling techniques mainly focused on the description of low-level model, such as geometric and physical properties, but lacked of abstraction and description of high-level application for the dynamic maintenance process. So a High-level Descriptive Simulation Model for Underwater Virtual Maintenance (HDMUM) was proposed. Three parts of simulation model, i.e., simulation entity, operation scene and maintenance process, were abstracted and described from the high-level application. All of the HDMUM components and their relationship were designed to …
Arm-Based Real-Time Video Stabilization Enhancement Algorithm, Xiaoquan Chen, Zhang Lei, Huang Hua
Arm-Based Real-Time Video Stabilization Enhancement Algorithm, Xiaoquan Chen, Zhang Lei, Huang Hua
Journal of System Simulation
Abstract: Considering the performance characteristic of ARM processor, an ARM-based real-time video stabilization enhancement algorithm was proposed that identified shakiness of video and implements motion smoothing in the space of geometric transformations. The algorithm identified the shakiness of video with the amplitudes’ change of translation and rotation. Then the optimal path could be obtained by linear interpolation on translational vector and rotational angle. Stable frames were generated by implementing motion compensation of translation and rotation transformations respectively. Because the algorithm used linear interpolation in the space of rigid transformations, it was much faster than the previous algorithms. Moreover, it …
Slicing Algorithm For Heterogeneous Nurbs Volume Parameterization Model, Chen Long, Ruan Chen, Wenyu Han
Slicing Algorithm For Heterogeneous Nurbs Volume Parameterization Model, Chen Long, Ruan Chen, Wenyu Han
Journal of System Simulation
Abstract: Heterogeneous NURBS Volume Parametric Model is attached importance for its ability to express the Information of materials continuously. But there is scarce study on the slicing algorithm of heterogeneous NURBS volume parametric model for rapid prototyping yet. A slicing algorithm for heterogeneous NURBS volume parametric model was proposed. The materials were expressed by putting the material information on control points and display different color to represent different materials. The model was divided into patches by iso-line. Find out the patches which intersect with the given cutting plane, then get the sections of the meshes containing material information. The results …
Online Furniture Layout Method Based On Case-Based Reasoning And Distance Fields, Peihua Song, Jinyuan Jia
Online Furniture Layout Method Based On Case-Based Reasoning And Distance Fields, Peihua Song, Jinyuan Jia
Journal of System Simulation
Abstract: A furniture layout method based on case-based reasoning and distance fields was proposed to meet online real-time response requirements. Three partial layout modes were summarized. Coupling layout mode was solved using case-based reasoning combined and mathematical model; matrix layout mode and furniture spacing algorithm were proposed; enclosed layout mode was solved using a personification rules and energy distribution function based on distance fields. Scene layout was divided into several partial layout modes, which were solved and synthetized. Experimental results show that effect of the method is similar to the real design case, and the method is robust, and the …
Method For Crowd Trampling And Crushing Simulation Based On Psychological Model, Tingting Liu, Liu Zhen, Yanjie Chai, Cuijuan Liu, Jiaxin Chen
Method For Crowd Trampling And Crushing Simulation Based On Psychological Model, Tingting Liu, Liu Zhen, Yanjie Chai, Cuijuan Liu, Jiaxin Chen
Journal of System Simulation
Abstract: With the accelerated development of urbanization, the number and the scale of cultural events have increased rapidly. In such crowded places, the risk of crowd trampling and crushing will be greatly increased. However, the current studies on crowd trampling and crushing simulation are relatively rare. In order to deduce the crowd trampling and crushing scene, a crowd trampling and crushing simulation model based on the psychological principles was proposed. The model considered emotional factors for the trampling and crushing in the dense crowd; simulated crowd trampling and crushing process and introduced the judgment criterions for the crowd trampling and …
Random Reversible Matrix Based Point Cloud Encryption, Zhaoxing Wu, Jin Xin, Chenggen Song, Chunwei Zhang, Xiaodong Li
Random Reversible Matrix Based Point Cloud Encryption, Zhaoxing Wu, Jin Xin, Chenggen Song, Chunwei Zhang, Xiaodong Li
Journal of System Simulation
Abstract: Paying less attention to the privacy protection in the 3D model, an encryption scheme based on chaotic map of 3D point cloud model was proposed, which realized the encryption of 3D point cloud, that used chaotic maps to generate a 3×3 random reversible matrix and a 3×1 translation vector, used the above random reversible matrix and the translation vector can transform each point of the point cloud to a homogeneous coordinate. After a lot of tests on different 3D point cloud models were carried out, the test results show that each point cloud model can be correctly encrypted …
Block Algorithm For Geometric Division Of Planar Region Based On Vector And Raster Interblended, Guojun Chen, Jingyi Liu, Yingying Huang
Block Algorithm For Geometric Division Of Planar Region Based On Vector And Raster Interblended, Guojun Chen, Jingyi Liu, Yingying Huang
Journal of System Simulation
Abstract: Using the vector method to maintain the accuracy of the data and the raster method to decrease the search scope, an algorithm was proposed for geometrics division of planar region based on vector and raster interblended. Special treatments for the raster filling polygon of "dead-zone" and the continuous multi-island polygon to adaptively dealt with the common polygon and the polygon with island, as well as the local individual polygons constructing and the global geometric division of planar region. In order to improve the time efficiency, geometric division of planar region used the block division process. Geometric division for sub-block …
Real Time Fluid Simulation Framework Based On Directcompute, Liu Lu, Liu Zhen, Gaoqi He, Chen Tian, Tingting Liu, Cuijuan Liu
Real Time Fluid Simulation Framework Based On Directcompute, Liu Lu, Liu Zhen, Gaoqi He, Chen Tian, Tingting Liu, Cuijuan Liu
Journal of System Simulation
Abstract: A real time fluid simulation framework based on DirectCompute acceleration was proposed to solve problems of low simulation efficiency that caused by the increasing fluid particle size and long processing time that caused by the complex solid-liquid boundary. In the simulation, a grid local collision detection method was adopted to speed up the search for the solid-liquid boundary. Fluid calculation, collision detection and surface reconstruction were computed parallel in the GPU with DirectCompute technology to accelerate the SPH fluid simulation. It could optimize the storage structure of fluid simulation, and save the storage space. Experimental results show that the …
Gpu-Accelerated Cloth Animation Based On Module Division, Kun Zhou, Liu Zhen, Gaoqi He, Chen Tian, Tingting Liu, Cuijuan Liu
Gpu-Accelerated Cloth Animation Based On Module Division, Kun Zhou, Liu Zhen, Gaoqi He, Chen Tian, Tingting Liu, Cuijuan Liu
Journal of System Simulation
Abstract: In order to improve the simulation speed of cloth animation, a module division parallel computing method was proposed by studying two kinds of cloth simulation models with dynamics and position based dynamics (PBD). A computing task was divided into a plurality of independent blocks by the way of data block. GPU parallel computing was used within the data block to improve the real-time performance and robustness of the cloth simulation. The applicability and effectiveness of the algorithm were verified under different scenarios and stochastic wind field. Experimental results show that under the same conditions, the proposed method can effectively …
Subdivision Algorithm For Computing The Minimum Distance Between Two Algebraic Curves, Jiadai Qi, Huahao Shou
Subdivision Algorithm For Computing The Minimum Distance Between Two Algebraic Curves, Jiadai Qi, Huahao Shou
Journal of System Simulation
Abstract: Since it is difficult to compute the minimum distance between two algebraic curves by traditional methods when the expressions of the algebraic curves are complicated, a subdivision algorithm is proposed. Quadtree data structure was used to subdivide the two algebraic curves into two sets of pixels. Interval arithmetic was used to compute the minimum distance interval between these two sets of pixels. The center of this interval is the approximation of the minimum distance between the two algebraic curves. The error is less than a half of this interval. Compared with traditional methods, this method can obtain the approximation …