Shape transformer nets: Generating viewpoint-invariant 3D shapes from a single image

Single-view 3D shapes generation has achieved great success in recent years. However, current methods always blind the learning of shapes and viewpoints. The generated shape only fit the observed viewpoints and would not be optimal from unknown viewpoints. In this paper, we propose a novel encoder–decoder based network which contains a disentangled transformer to generate the viewpoint-invariant 3D shapes. The differentiable and parametric Non-uniform B-spline (NURBS) surface generation and 3D-to-3D viewpoint transformation are incorporated to learn the viewpoint-invariant shape and the camera viewpoint, respectively. Our new framework allows us to learn the latent geometric parameters of shapes and viewpoints without knowing the ground truth viewpoint. That can simultaneously generate camera-viewpoint and viewpoint-invariant 3D shapes of the object. We analyze the effects of disentanglement and show both quantitative and qualitative results of shapes generated at various unknown viewpoints.     

基于资源观的虚拟企业组建决策支持系统的构架

分析了虚拟企业的资源特性,指出资源观是联系虚拟企业组建各过程的纽带;以资源观为主线,采用三段式序贯决策描述虚拟企业组建过程,具体包括资源配置-伙伴标准决策、伙伴预选决策和伙伴协商决策;在分析资源多面性的基础上,为解决跨领域决策带来的弊端,提出了领域组织群决策思想。基于MVC思想和J2EE/JavaBean/EJB的可重用性组件技术,采用B/S软件结构实现了决策支持系统。     

基于网格显著度的视点质量计算方法*

从模糊贴近度的角度,结合网格显著度概念,给出了一种新的视点质量计算方法。首先将场景中的每个三角形看做论域中的一个样本,从可见度大小的角度定义隶属函数,为视点构造一个模糊集合;然后结合三角形的几何面积及面片显著度给出一个对应理想视点的模糊集;最后求取两个模糊集合的贴近度作为视点质量的评价准则。实验结果表明,该算法能够较好地反映视点质量。     

武汉城市总体规划前期研究的实践与思考

新一轮的城市总体规划在时代背景、编制条件和规划统筹等方面发生了深刻变化,坚持科学发展观,提倡政府组织、专家领衔的研究过程,既是对总规技术统筹工作的考验,又是对总规修编组织运作的挑战.结合武汉新一轮城市总体规划的编制实践,介绍了前期研究的组织过程和得失经验,期望能够为大家提供一些有价值的参考.     

以“动态”观点分析判断排除设备故障

主要介绍了“动态”观点分析判断设备故障的简单方法,并且通过2个现场的维修实例来加以说明,如何引导维修人员以“动态”观点分析、判断和排除设备故障,将设备故障以最短的时间内排除,值得借鉴。     

When is it Possible to Identify 3D Objects From Single Images Using Class Constraints?

One approach to recognizing objects seen from arbitrary viewpoint is by extracting invariant properties of the objects from single images. Such properties are found in images of 3D objects only when the objects are constrained to belong to certain classes (e.g., bilaterally symmetric objects). Existing studies that follow this approach propose how to compute invariant representations for a handful of classes of objects. A fundamental question regarding the invariance approach is whether it can be applied to a wide range of classes. To answer this question it is essential to study the set of classes for which invariance exists. This paper introduces a new method for determining the existence of invariant functions for classes of objects together with the set of images from which these invariants can be computed. We develop algebraic tests that determine whether the objects in a given class can be identified from single images. These tests apply to classes of objects undergoing affine projection. In addition, these tests allow us to determine the set of views of the objects which are degenerate. We apply these tests to several classes of objects and determine which of them is identifiable and which of their views are degenerate.     

生成体视动画的一种新方法

使用传统方法制作一幅体视画面很容易,但是要快速生成体视动画就比较困难。该文介绍了体视动画的观察方法,并针对流行动画软件中摄像机数据的特点,提出了在计算机上自动生成体视劝画的算法。最后给出了发动机装配过程动态模拟体视动画中的一帧左、右图像及合成后的图像。     

对化学镀镍机理的新看法

在实验基础上提出度镍机理的一些新看法,并从热力不角度进行了讨论。     

基于特征点检测的三维模型最佳视点选择

针对三维模型最佳视点选择问题,提出了一种基表面特征点检测的视点选择算法。首先引入一种基于局部平均形心距离差的顶点显著性度量方法,认为三维网格模型表面某顶点的显著性是由该顶点与形心之间距离和该顶点邻域内的顶点与形心之间距离的平均差值来刻画,而不是该点所在位置的弯曲程度所决定;然后根据顶点的显著性大小进行三维模型表面特征点检测;最后针对视点球体上的每个候选视点分析该视点下可见特征点的几何分布和显著度大小计算视点质量,提取出最佳视点。实验结果验证了基于三维模型特征点的视点选择方法的有效性,在能够选择出质量较优的视点的同时保证算法的效率。     

对欧洲城市与建筑的认知与研究

欧洲九国考察对开阔视野、拓展设计思维有现实意义。本文除国外考察的印象外,还就建筑与环境,欧式建筑形式、风格,雕塑绘画艺术,城市乡村概念,新现代居住建筑视点等提出了五点认知。