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2011 International Conference on Virtual Reality and Visualization最新文献

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Development of Panorama Manifestation System and Its Comparison with Desk-Top System 全景显示系统的开发及其与桌面系统的比较
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.21
F. Meng, W. Zhang, R. Yang
Virtual Reality (VR) system is an effective experimental study tool within the areas of cognitive psychology, neurosciences and psychophysiology. In this study, a new VR system, called panorama manifestation (PM) system, was developed and it was compared with a regular desktop (DT) system for two experimental way finding tasks in terms of success rate (SR), completion time (CT), difficulty index (DI), recalling accuracy (RA), and confidence index (CI). Results showed that although participants had similar SRs and gave similar DIs with these two systems, participants in PM system had less CT, more accurate route recalling and more confidence in judgment. The results indicate that the proposed PM system had higher fidelity for some spatial task experiments and could provide more support for participants' way finding tasks.
虚拟现实(VR)系统是认知心理学、神经科学和心理生理学等领域有效的实验研究工具。本研究开发了一种新的虚拟现实系统全景显示(PM)系统,并将其与常规桌面(DT)系统在两个实验寻路任务中进行成功率(SR)、完成时间(CT)、难度指数(DI)、回忆准确率(RA)和置信度指数(CI)的比较。结果显示,虽然两种系统的SRs和DIs相似,但PM系统的CT更少,路线回忆更准确,判断信心更强。实验结果表明,该系统在空间任务实验中具有较高的保真度,可以为参与者的寻路任务提供更多的支持。
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引用次数: 1
3D Model Multiple Semantic Automatic Annotation for Small Scale Labeled Data Set 小尺度标记数据集三维模型多语义自动标注
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.54
Feng Tian, Xukun Shen, Liu Xian-mei, Xie Hong-tao
Automatically assigning keywords to 3D models is of great interest as it allows one to retrieve, index, organize and understand large collections of 3D models. Most Methods require high sample size for training, so the data quality is in high demand. For small scale labeled data set, we propose a semi-supervised method to realize the 3D models multiple semantic annotation, which needs only a small amount of hand tagged information provided by users. The proposed technique utilizes low-level shape features and the keywords are assigned using a graphed-based label transfer mechanism to expand the training dataset. A weighted metric learning method is used to learn the distance measure from the extended dataset. Then multiple semantic annotation task can be completed on the learned distance measure. The proposed method outperforms the current state-of-the-art methods on the small scale labeled dataset and large unlabelled dataset. We believe that such measure will provide a strong platform to label 3D models when a small amount of labeled models were given.
自动为3D模型分配关键字是非常有趣的,因为它允许人们检索,索引,组织和理解大型3D模型集合。大多数方法需要较大的样本量进行训练,因此对数据质量要求很高。对于小规模的标注数据集,我们提出了一种半监督的方法来实现3D模型的多重语义标注,该方法只需要用户提供少量的手工标注信息。该技术利用低级形状特征,并使用基于图的标签传递机制分配关键字以扩展训练数据集。使用加权度量学习方法从扩展数据集中学习距离度量。然后在学习到的距离测度上完成多个语义标注任务。该方法在小规模标记数据集和大型未标记数据集上优于当前最先进的方法。我们相信,当给定少量的标记模型时,该措施将为3D模型的标记提供一个强大的平台。
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引用次数: 1
A Visual Hull Algorithm of 3D Reconstruction Based on Interframe Coherence 基于帧间相干的视觉船体三维重建算法
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.16
Chen Guojun, Shen Bao-ming
The traditional volumetric visual hull generating methods were not applicable to real-time objects due to frame by frame calculations. A fast new algorithm based on inter frame coherence was represented for fast reconstructing an object's visual hull from its silhouettes in this paper. Utilizing frame to frame coherence of inter frame visual hulls and motion estimation, the numbers of voxels that need to be calculated were adjusted dynamically without having to calculate all the voxels. The solution improved the time efficiency by decreasing the computation cost. The results of the experiments show that this generation algorithm is superior to some classical visual hull methods, as far as its reconstruction function for time complexity is concerned.
传统的体视觉船体生成方法由于需要逐帧计算,因此不适合实时目标生成。提出了一种基于帧间相干性的快速重建目标视觉外壳的算法。利用帧间视觉壳的帧间一致性和运动估计,无需计算所有体素,即可动态调整需要计算的体素数。该方案通过降低计算成本提高了时间效率。实验结果表明,该生成算法在时间复杂度上的重构功能优于经典的视觉船体生成方法。
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引用次数: 1
Motion Data Retrieval from Very Large Motion Databases 从非常大的运动数据库的运动数据检索
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.50
Cheng Ren, Xiaoyong Lei, Guofeng Zhang
The reuse of motion capture data has become an important way to generate realistic motions. Retrieval of similar motion segments from large motion datasets accordingly serves as a fundamental problem for data-based motion processing methods. The retrieval task is difficult due to the spatio-temporal variances existing in human motion. With the increasing amount of data, the retrieval task has become even more time consuming. In this paper, we present a motion retrieval approach that is capable of extracting similar motion subsequences from very large motion databases given a query motion input. Our method employs BIRCH-based(Balanced Iterative Reducing and Clustering using Hierarchies) clustering method to incrementally cluster poses so as to effectively deal with very large datasets. An elastic LCS(longest common subsequence) algorithm is then proposed to discover the similar motion subsequences based on the posture clustering result. Finally, the motion patterns are extracted and stored, with each pattern containing a set of similar motions. In the runtime retrieval stage, as each stored pattern effectively compared with the query motion, the group of the similar motions is acquired. Experimental results show that our method successfully retrieves similar motions and outperforms the existing methods in time and space costs when applying to very large motion datasets.
运动捕捉数据的重用已成为生成逼真运动的重要途径。相应地,从大型运动数据集中检索相似的运动片段是基于数据的运动处理方法的一个基本问题。由于人体运动存在时空差异,检索任务比较困难。随着数据量的增加,检索任务变得更加耗时。在本文中,我们提出了一种运动检索方法,该方法能够在给定查询运动输入的情况下从非常大的运动数据库中提取相似的运动子序列。该方法采用基于birch (Balanced Iterative reduction and Clustering using Hierarchies)的聚类方法对姿态进行增量聚类,从而有效地处理非常大的数据集。然后提出了一种弹性LCS(最长公共子序列)算法,基于姿态聚类结果发现相似的运动子序列。最后,提取并存储运动模式,每个模式包含一组相似的运动。在运行时检索阶段,将每个存储模式与查询运动进行有效比较,获得相似运动组。实验结果表明,当应用于非常大的运动数据集时,我们的方法成功地检索了相似的运动,并且在时间和空间成本上优于现有的方法。
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引用次数: 13
Haptic Rendering of Virtual Hand with Force Smoothing 基于力平滑的虚拟手触觉渲染
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.11
Miao Feng, Jiting Li, Ruoyin Zheng
In this paper, we present methods to generate a stable and realistic force rendering between virtual hand and object for a hand rehabilitation system. There are multi-contact regions between hand and object. For each contact region, the virtual contact force is modeled upon the spring-mass model. As direct rendering with spring-mass model in a large stiffness will induce instability of the haptic device, we apply a force-smoothing method by limiting the maximum force variation to guarantee the stability in the haptic rendering. The system experiment results demonstrate that the proposed method can provide satisfactory stable haptic display. And the maximum virtual stiffness that the system can simulate increases from 0.7 N/mm to 1.6N/mm by using force smoothing process.
在本文中,我们提出了一种方法来生成稳定和逼真的虚拟手和物体之间的力渲染为手部康复系统。手与物体之间存在多接触区域。对于每个接触区域,虚拟接触力是在弹簧-质量模型上建模的。针对大刚度下弹簧-质量模型直接绘制会导致触觉装置不稳定的问题,我们采用了一种力平滑方法,通过限制最大力变化来保证触觉绘制的稳定性。系统实验结果表明,该方法能够提供令人满意的稳定触觉显示。通过力平滑处理,系统能模拟的最大虚拟刚度由0.7 N/mm提高到1.6N/mm。
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引用次数: 1
Noniterative Adaptive Sampling for Image-Based Rendering 基于图像渲染的非迭代自适应采样
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.49
Wen Qin, Zhijiang Zhang
The contradiction between data quantity and rendering quality is a rather troublesome issue in Image-Based Rendering (IBR). In this paper, we present an adaptive sampling method to relieve the contradiction. This method determines the sampling positions by using minimum expectation error criterion of the signal waveform. It is a non-iterative sampling process and could reach a quite good rendering quality with a little date quantity. Also, the method uses each ray in a camera as an independent sample and adjusts them individually. We apply this method to the IBR sampling and reconstruction with a light field setup. The experimental results show that the rendering quality is 3.7~7.8dB higher than that of the traditional method with the same sample size. The PSNR is above 30dB with less than 15% of the original samples. This method can apply to 1-D, 2-D signals and other kinds of IBR technologies.
数据量与绘制质量之间的矛盾是基于图像的绘制(IBR)中一个比较棘手的问题。本文提出了一种自适应采样方法来解决这一矛盾。该方法利用信号波形的最小期望误差准则确定采样位置。它是一个非迭代的采样过程,可以用少量的数据量获得相当好的渲染质量。此外,该方法将相机中的每条光线作为一个独立的样本,并单独调整它们。我们将此方法应用于光场设置下的IBR采样和重建。实验结果表明,在相同样本量的情况下,该方法的渲染质量比传统方法提高3.7~7.8dB。PSNR在30dB以上,小于原始样品的15%。该方法适用于一维、二维信号和其他IBR技术。
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引用次数: 0
Modeling and Visualizing Dynamic Component for Virtual Educational Experiments 虚拟教育实验动态组件的建模与可视化
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.60
Ziqiang Yang, Xiaowu Chen, Guodong Jia
Virtual experiments have been used in education for a long time. However, most of the virtual experiments are modeled only for some special subjects, and are programmed case by case. To handle these problems, an online system of Virtual Educational Experiments (VEEs) is designed to develop various virtual experiments and simplify the virtual experiment modeling by reusing the existed experiment components. Based on the system of VEEs, we proposed a method of modeling and visualizing dynamic experiment components. Firstly, the dynamic experiment components are modeled based on the combination of images and graphics. Then the visualization of the dynamic experiment components is designed for multidisciplinary virtual experiments. The system has been running in some colleges and universities for several months. The tests show that it can rapidly model dynamic experiment components and realistically visualize the dynamic experiment components for the system of VEEs.
虚拟实验在教育中应用已经很长时间了。然而,大多数的虚拟实验只针对一些特殊的主题进行建模,并且是逐例编程的。为了解决这些问题,设计了一个在线虚拟教学实验系统,通过重用已有的实验组件来开发各种虚拟实验,并简化虚拟实验的建模。基于vee系统,提出了一种动态实验组件的建模和可视化方法。首先,采用图像与图形相结合的方法对动态实验构件进行建模;然后针对多学科虚拟实验,设计了动态实验组件的可视化。该系统已经在一些高校运行了几个月。试验结果表明,该方法能够快速建立动态实验组件的模型,并能使系统动态实验组件可视化。
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引用次数: 0
Automatic Navigation Algorithm in Virtual Complex Indoor Scenes 虚拟复杂室内场景中的自动导航算法
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.29
Zeng Hong, Zhang Jundong, Jiang Ruizheng, Feng Jinhong
To meet the demand for efficient automatic navigation in virtual complex indoor scenes, this paper presents an automatic navigation algorithm. The algorithm uses Dijkstra algorithm for path planning on complex indoor scenes graph, and uses the adaptive vector length algorithm for Bezier curve control point to smooth the path. The paper indicates that path planning in indoor scene is a weighted and non oriented graph's shortest path problem. The paper gives the shortest path searching step by Dijkstra algorithm. In order to eliminate the vision dither phenomenon and enhance the immersed feeling during navigation, the paper uses Bezier curve to smooth path. According to the path included angle and distance between nodes, the paper proposes an adaptive vector length algorithm for curve control point. Finally, an example about marine engine room virtual scene navigation system was given. The algorithm given in this paper was demonstrated to be significant in complex indoor scene navigation.
为满足虚拟复杂室内场景中高效自动导航的需求,提出了一种自动导航算法。该算法采用Dijkstra算法对复杂室内场景图进行路径规划,采用Bezier曲线控制点自适应向量长度算法对路径进行平滑处理。指出室内场景的路径规划是一个加权无方向图的最短路径问题。本文给出了用Dijkstra算法进行最短路径搜索的步骤。为了消除视觉抖动现象,增强导航时的沉浸感,本文采用Bezier曲线平滑路径。根据路径包含的角度和节点之间的距离,提出了一种自适应的曲线控制点矢量长度算法。最后,给出了船舶机舱虚拟场景导航系统的实例。该算法在复杂的室内场景导航中具有较好的效果。
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引用次数: 0
A Fast Automatic and Robust Image Registration Algorithm 一种快速、自动、鲁棒的图像配准算法
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.53
Qi Zhang, Zhijiang Zhang, Dan Zeng
In this paper, a fast automatic and robust image registration algorithm is presented. First, we use the Fourier transform to calculate the relative position between the input images and sort the unordered image sequence. For two images with overlap region, we detect the feature points in the part of the region in one of the image with the robust method of SIFT. According to the coordinates of the feature points and the position relationship of two images, we can compute the space of the feature points in another image and detect the feature points in this region. Then, we use the geometric relation to reduce some mismatch points with structurally similar and achieve the robust image registration. We demonstrate illustrative results obtained by comparing and contrasting our output with other methods. This method can detect the effective feature points quickly for reducing the detection range of the feature points without human intervention and reduce the running time greatly in ensuring the feature points matching accuracy.
提出了一种快速、自动、鲁棒的图像配准算法。首先,利用傅里叶变换计算输入图像之间的相对位置,并对无序图像序列进行排序。对于具有重叠区域的两幅图像,采用SIFT鲁棒方法检测其中一幅图像中该区域部分的特征点。根据特征点的坐标和两幅图像的位置关系,我们可以计算另一幅图像中特征点的空间,并检测该区域内的特征点。然后,利用几何关系减少结构相似的不匹配点,实现图像的鲁棒配准。通过将我们的输出与其他方法进行比较和对比,我们给出了说明性的结果。该方法可以快速检测出有效的特征点,在不需要人工干预的情况下减少特征点的检测范围,在保证特征点匹配精度的同时大大减少了运行时间。
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引用次数: 1
Flexible Painting-Based Volume Classification Using Ellipsoid Gaussian Transfer Function 基于椭球高斯传递函数的柔性绘画体分类
Pub Date : 2011-11-04 DOI: 10.1109/ICVRV.2011.28
Yuetong Luo, Jinsheng Chen, Hanbin Wang, Deqing Qu, Jie Wang, Wenmin Tan
The paper focuses on appearance and spatial property-based volume classification with a painting interface. Two key problems exist, i.e., effectively propagating user-given painting to the entire volume and intuitively controlling the roles of appearance and spatial properties, which are not well solved in existing painting-based transfer function specification methods. The present paper formulates painting propagation as a function interpolation problem in a high-dimensional affine space and solves it effectively using Gaussian radial basis functions. For the second problem, the present work presents a two-step approach, which first propagates the user-given painting to the entire volume using appearance- and spatial-property-dominated feature vectors, and then combines the painting propagation results using an ellipsoid Gaussian transfer function (ETF) for volume classification. The user can intuitively manipulate ETF using system-provided widgets. The effectiveness of the proposed method has been verified on several datasets.
本文的重点是基于外观和空间属性的体分类与绘画界面。现有的基于绘画的传递函数规范方法没有很好地解决两个关键问题,即将用户给定的绘画有效地传播到整个体量,以及直观地控制外观和空间属性的作用。本文将绘制传播表述为高维仿射空间中的函数插值问题,并利用高斯径向基函数有效地求解了该问题。对于第二个问题,本研究提出了一种两步方法,首先使用外观和空间属性主导的特征向量将用户给定的绘画传播到整个体,然后使用椭球高斯传递函数(ETF)将绘画传播结果结合起来进行体分类。用户可以使用系统提供的小部件直观地操作ETF。在多个数据集上验证了该方法的有效性。
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引用次数: 0
期刊
2011 International Conference on Virtual Reality and Visualization
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