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This article presents a system to automatically generate compact explosion diagrams. Inspired by handmade illustrations, our approach reduces the complexity of an explosion diagram by rendering an exploded view only for a suitable subset of the assemblies of an object. However, the exploded views are chosen so that they allow inferring the remaining unexploded assemblies of the entire 3D model. In particular, our approach demonstrates the assembly of a set of identical groups of parts by presenting an exploded view only for a single representative. In order to identify the representatives, our system automatically searches for recurring subassemblies. It selects representatives depending on a quality evaluation of their potential exploded view. Our system takes into account visibility information of both the exploded view of a potential representative as well as visibility information of the remaining unexploded assemblies. This allows rendering a balanced compact explosion diagram, consisting of a clear presentation of the exploded representatives as well as the unexploded remaining assemblies. Since representatives may interfere with one another, our system furthermore optimizes combinations of representatives. The optimization process also generates good views on the explosion diagram. Labels are added to the explosion diagram to increase the visibility of small or occluded parts. Throughout this article, we show a number of examples, which all have been rendered from unmodified 3D CAD data. 相似文献
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This paper argues that existing definitions of viewpoints in software engineering are inadequate for requirements engineering (RE). The ESPRIT 6353 NATURE basic research action proposes an alternative definition which recognises that viewpoints are social artefacts within the RE process. It also proposes novel computational mechanisms for analysing different viewpoints as a basis for more informed negotiation between viewpoint owners. This paper reports important aspects of this research and outlines an agenda for future research in multiperspective RE.This work was conducted when the author was with the Institute of Computer Science, Foundation for Research of Technology-Hellas 相似文献
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对于深海水下摄影,由于相机平移和旋转,图像对应关系很难自动生成,因此需对应点映射来求解图像间的变换.本文通过摄像机自身所带仪器,测量摄像机焦点和任意物点所在位置,得出不同图像中相同物点所对应的像点.对于两幅图像的映射关系,原理上讲,一般输入三组对应点即可,但考虑到误差和相关性等因素,输入较多的对应点,时所求结果进行优化.将一幅图像映射到另一幅图像所在平面,对两幅图像进行平滑拼接.最后给出计算机实验结果. 相似文献
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对于深海水下摄影,由于相机平移和旋转,图像对应关系很难自动生成,因此需对应点映射来求解图像间的变换。本文通过摄像机自身所带仪器,测量摄像机焦点和任意物点所在位置,得出不同图像中相同物点所对应的像点。对于两幅图像的映射关系,原理上讲,一般输入三组对应点即可,但考虑到误差和相关性等因素,输入较多的对应点,对所求结果进行优化。将一幅图像映射到另一幅图像所在平面,对两幅图像进行平滑拼接。最后给出计算机实验结果。 相似文献
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目前的多透视拼接算法存在两点局限:1)需要大量源视点以保证足够多的拼接切片可以提取;2)视点方向应与水平运动方向垂直以模拟与场景面的正交投影或视点旋转角度较小以实现最小扭曲拼接。这两点很大程度上限制了多视点拼接的应用。为此,提出一个基于稀疏可旋转视点的多透视拼接算法。该算法采取两步走的策略,即:虚拟变换和同步校正与配准,解决相邻视点成像时因与场景面不垂直而产生的不同程度透视变形以及视点因旋转角度变化而产生的重叠区域变化问题,实现稀疏可旋转视点图像拼接。实验结果表明该算法是有效的。 相似文献
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日常生活中人们分拣辨别不同种类的苹果需要消耗大量的人力物力,为解决这一问题,提出了一种基于多角度多区域特征融合的苹果图像分类方法。首先,收集五类总共329个苹果,使用手机摄像头从上面、下面和3个不同侧面共五个角度采集每个苹果的图像,每个图像裁剪若干个(1~9)区域块;其次,每个区域块用颜色直方图向量来表示,多个区域块的直方图向量通过首尾相连进行融合,以此生成一个图像的表示;最后,将得到的329个样本数据用12种分类器进行分类比较。实验结果表明,当多角度多区域图像特征融合时,分类效果总是好于单角度单区域,而且越多越好;当使用5个角度的图像,每个图像裁剪9个区域时,偏最小二乘(PLS)分类器的分类精度达到97.87%,好于深度学习。所提方法操作简单、精度较高,算法复杂度为4n,n为图像裁剪区域块总数,可以推广成手机应用,并应用到更多水果和植物图像分类上。 相似文献
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为解决现有电商水军特征模型对文化产品水军识别不足以及单一分类器识别精度不高的问题,提出面向文化产品水军的多视角特征表达与识别模型.根据文化产品具有丰富的语义性、严格的时效性以及网络交互性等3个特点,从内容、行为、属性3个视角提出了评论主题相似度、平均有用度、行为关联性、兴趣关联性、平均评价积极度和综合质量评价等特征.将... 相似文献
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针对目前现有的新闻推荐系统未能充分考虑新闻的语义信息,对新闻文本建模因子的单一性问题,提出注意力与多视角融合的新闻推荐算法(Attention-BodyTitleEvent, Attention-BTE).利用BERT模型以及注意力机制分别对新闻标题、正文、事件向量化,将三者融合即新闻向量化表示,再对候选新闻和用户浏览新闻数据进行处理,分别得到对应的候选新闻向量化和用户向量化,并将其进行点乘得到用户点击候选新闻的概率,即新闻推荐结果.实验数据表明,与其他的新闻推荐算法相比,该模型在F1指标上提高了约6%. 相似文献
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在业务过程发现的一致性检测中,现有事件日志与过程模型的多视角对齐方法一次只能获得一条迹与过程模型的最优对齐;并且最优对齐求解中的启发函数计算复杂,以致最优对齐的计算效率较低。为此,提出一种基于迹最小编辑距离的、事件日志的批量迹与过程模型的多视角对齐方法。首先选取事件日志中的多条迹组成批量迹,使用过程挖掘算法得到批量迹的日志模型;进而获取日志模型与过程模型的乘积模型及其变迁系统,即为批量迹的搜索空间;然后设计基于Petri网变迁序列集合与剩余迹的最小编辑距离的启发函数来加快A*算法;最后设计可调节数据和资源视角所占权重的多视角代价函数,在乘积模型的变迁系统上提出批量迹中每条迹与过程模型的多视角最优对齐方法。仿真实验结果表明,相比已有工作,在计算批量迹与过程模型间的多视角对齐时,所提方法占用更少的内存空间和使用更少的运行时间。该方法提高了最优对齐的启发函数计算速度,可以一次获得批量迹的所有最优对齐,进而提高了事件日志与过程模型的多视角对齐效率。 相似文献
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主要研究两个导航模块间的相对导航,并实现了两导航模块间相对位置的实时测量。讨论了不同坐标系下定位结果的互相转换。对导航模块输出数据进行了简要的分析,叙述了在Visual Studio编译环境下利用C#语言编写程序实现对定位数据的提取分析,并对两个模块定位信息处理从而实时计算出两个导航模块的相对位置信息。 相似文献
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Assignment of Movies to Heterogeneous Video Servers 总被引:1,自引:0,他引:1
《IEEE transactions on systems, man, and cybernetics. Part A, Systems and humans : a publication of the IEEE Systems, Man, and Cybernetics Society》2005,35(5):665-681
A video-on-demand (VOD) system provides an electronic video rental service to geographically distributed users. It can adopt multiple servers to serve many users concurrently. As a VOD system is being used and evolved, its servers probably become heterogeneous. For example, if a new server is added to expand the VOD system or replace a failed server, the new server may be faster with a larger storage size. This paper investigates how to assign movies to heterogeneous servers in order to minimize the blocking probability. It is proven that this assignment problem is NP-hard, and a lower bound is derived on the minimal blocking probability. The following approach is proposed for assignment: 1) problem relaxation—a relaxed assignment problem is formulated and solved to determine the ideal load that each server should handle, and 2) goal programming—an assignment and reassignment are performed iteratively while fulfilling all the constraints so that the load handled by each server is close to the ideal one. This approach is generic and applicable to many assignment problems. This approach is adopted to design two specific algorithms for movie assignment with and without replication. It is demonstrated that these algorithms can find optimal or close-to-optimal assignments. 相似文献