共查询到20条相似文献,搜索用时 31 毫秒
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A. A. Boriskevich V. K. Erohovets V. V. Tkachenko 《Optical Memory & Neural Networks》2012,21(4):242-248
The estimating problem of 3D holograms orientation selectivity on angular, orthogonal, and azimuthal sensitivity parameters is formulated and solved. Tenfold increase of density 3D, 2D/3D holograms in comparison with 2D holograms at given selectivity for ones is shown in theory and experimentally. 相似文献
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We present a tracking method where full camera position and orientation is tracked from intensity differences in a video sequence. The camera pose is calculated based on 3D planes, and hence does not depend on point correspondences. The plane based formulation also allows additional constraints to be naturally added, e.g., perpendicularity between walls, floor and ceiling surfaces, co-planarity of wall surfaces etc. A particular feature of our method is that the full 3D pose change is directly computed from temporal image differences without making a commitment to a particular intermediate (e.g., 2D feature) representation. We experimentally compared our method with regular 2D SSD tracking and found it more robust and stable. This is due to 3D consistency being enforced even in the low level registration of image regions. This yields better results than first computing (and hence committing to) 2D image features and then from these compute 3D pose. 相似文献
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The paper discusses Virtual Studio software which provides nonprofessional animators with inexpensive and easy-to-use 3D animation systems that have the functionality of complex and costly professional platforms. Virtual Studio is built on Virtuality Builder II, a graphics architecture based on objects and constraints that permits the manipulation and animation of synthetic worlds in three dimensions 相似文献
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页面描述语言是一种新型的程序设计语言,具有很强的图形描述功能。PostScript-3D是对PostScript语言的三维扩充,它支持三维观察变换、裁剪、3D路径、隐藏线和隐藏面消除、三维线框图和具有浓淡效应的真实感图形。本文对PostScript-3D的实现技术进行讨论,并把它与GKS-3D进行比较。 相似文献
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Sandy引擎是目前世界上最优秀的Flash三维引擎之一。利用Sandy引擎,开发人员可以轻松地创建出绚丽的Flash三维动画效果,并实现与用户的交互。该文在详细地介绍了Sandy引擎的基础上,通过具体的实例,深入浅出地介绍了利用Sandy引擎实现Flash三维动画的原理及相关的编程技巧。 相似文献
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Karima Ouji Mohsen Ardabilian Liming Chen Faouzi Ghorbel 《Journal of Mathematical Imaging and Vision》2013,47(1-2):124-137
Low-cost and high-accuracy 3D face measurement is becoming increasingly important in many computer vision applications including face recognition, facial animation, games, orthodontics and aesthetic surgery. In most cases fringe projection based systems are used to overcome the relatively uniform appearance of skin. These systems employ a structured light camera/projector device and require explicit user cooperation and controlled lighting conditions. In this paper, we propose a 3D acquisition solution with a 3D space-time non-rigid super-resolution capability, using three calibrated cameras coupled with a non calibrated projector device, which is particularly suited to 3D face scanning, i.e. rapid, easily movable and robust to ambient lighting variation. The proposed solution is a hybrid stereovision and phase-shifting approach, using two shifted patterns and a texture image, which not only takes advantage of stereovision and structured light, but also overcomes their weaknesses. The super-resolution scheme involves a shape+texture 3D non-rigid registration for 3D artifacts correction in the presence of small non-rigid deformations as facial expressions. 相似文献
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Sandy引擎是目前世界上最优秀的Flash三维引擎之一。利用Sandy引擎,开发人员可以轻松地创建出绚丽的Flash三维动画效果,并实现与用户的交互。该文在详细地介绍了Sandy引擎的基础上,通过具体的实例,深入浅出地介绍了利用Sandy引擎实现Flash三维动画的原理及相关的编程技巧。 相似文献
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The size of manufactured parts is naturally bound by the size of their production machines. In this paper, we explore the alternative of making a machine that can continuously navigate along an object being fabricated, producing objects larger than itself. The machine combines a climbing robot and a 3D printer. It uses an infinite fabrication loop which includes printing, reanchoring to a new station, and printing again. We present the design, construction, and characterization of the machine along with experiments on the fabrication of vertical columns. We also demonstrate the freeform fabrication capabilities of the machine by printing a moai statue. The results obtained have a wide range of applications for construction, product fabrication and promisingly broaden the current applications of 3D printing. 相似文献
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三维U系统矩与三维模型检索 总被引:1,自引:0,他引:1
提出3DU系统矩的定义,并将其应用于3D模型检索.作为一种可选定次数的完备正交多项式系统,U系统所定义的矩具有标准正交性、收敛性等优良性质.根据U系统理论实现了U1系统矩的高阶的快速计算,可以定义任意维数的特征空间.实验结果表明,3DU1系统矩优于几何矩和Zernike矩,具有更高的检索效率. 相似文献
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A brief outline of the structure of the Java 3D API as a means of producing graphical environments is provided. We then go on to examine issues in the development of a behaviour rich scene, in particular the issues of scene animation and collisions between scene objects. The animation issue is examined first, where issues of timing and architecture are considered. The Java 3D requirements for, and view of, collision are discussed next from a general perspective, identifying several problems with the implementation. Four simple scenes using animation and collision detection are examined. In each case a number of difficulties have been identified, partly related to the responsiveness of the operating system in the case of animation, but particularly due to the view and implementation of the collision detection system provided. Collisions often involve modifications to the states of all objects involved in the collision and some of the issues this raises in the context of Java 3D's provision are examined and reported on. Finally, we finish with a summary of our findings and conclusions on the suitability of Java 3D for building environments. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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正交样条矩与三维模型检索 总被引:2,自引:1,他引:1
提出三维正交样条矩的定义,并将其应用于三维模型检索.作为一种正交多项式函数系,正交样条函数结合球面调和函数所定义的矩具有正交性等优良性质.样条函数的局部性对于突出模型的局部特征有较好的效果.实验结果表明,三维正交样条矩优于三维小波矩,具有更高的检索效率. 相似文献
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The no-three-in-line problem, introduced by Dudeney in 1917, asks for the maximum number of points in the n × n grid with
no three points collinear. Erdos proved that the answer is Θ(n). We consider the analogous problem in three dimensions, and
prove that the maximum number of points in the n × n × n grid with no three collinear is Θ(n2). This result is generalised by the notion of a 3D drawing of a graph. Here each vertex is represented by a distinct gridpoint
in
, such that the line-segment representing each edge does not intersect any vertex, except for its own endpoints. Note that
edges may cross. A 3D drawing of a complete graph Kn is nothing more than a set of n gridpoints with no three collinear. A slight generalisation of our first result is that the
minimum volume for a 3D drawing of Kn is Θ(n3/2). This compares favourably with Θ(n3) when edges are not allowed to cross. Generalising the construction for Kn, we prove that every k-colourable graph on n vertices has a 3D drawing with
volume, which is optimal for the k-partite Turan graph. 相似文献
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