基于全景图像的三维全景漫游系统的构建

三维全景漫游系统以全景图的方式再现了三维场景,在浏览器上可以实现虚拟场景的漫游,具有很好的交互性和真实感。论文以海南数字生态旅游三维全景漫游系统的构建为目标,研究了利用鱼眼镜头和单电数码相机进行全景图像获取方法,以及对全景图像进行再次拼接制作360°全景图漫游系统。该系统构建方法为三维全景技术的应用提供了一个参考。     

基于WebGIS的全景照片管理与展示方法研究

全景照片技术是一种基于图像绘制技术的虚拟现实技术。分析全景照片技术的特点,基于经纬映射理论,设计一种在Papervision3D中对全景照片进行补差预处理和展示方法。研究基于GeoServer和Openlayers等开源WebGIS技术的全景照片管理方法,构建一个通用的全景照片预处理、管理和展示的过程。最后开发了基于WebGIS的全景照片管理与展示系统对上述方法进行验证。     

基于SIFT算法的嵌入式全景照片系统开发

全景照片也称为全景摄影或虚拟实景,是基于静态图像的虚拟现实技术,即把相机环360°拍摄的一组照片拼接成一个全景图像并进行显示。该文基于SIFT算法和嵌入式系统实现全景摄像技术装置,即通过ARM9平台将步进电机和摄像装置结合实现全景照相装置,之后在服务器通过HGE引擎开发相关系统,引入SIFT衔接算法将拍摄的多张照片进行拼接处理,并构建全景照片的虚拟环境,实现了全景照片的跑马灯展示效果。     

基于逆向投影的全景泊车系统设计与实现

全景泊车系统利用安装在车身前后左右的4个广角摄像头实时采集周围的图像,并传送给图像处理设备进行校正、俯视变换和图像合成,最后在显示屏上形成一幅360°的全景俯视图。系统以处理器HI3520D和视频解码器NVP1918C为硬件核心,以鱼眼校正、投影变换和逆向投影算法为软件核心,最终实现实时显示无缝和清晰画面的360°全景泊车影像系统。     

基于静态图像的互动虚拟全景技术及其应用

基于静态图像的虚拟全景技术是一种在微机平台上能够实现的初级虚拟现实技术。它让人们在网上能够进行360度全景观察,从而体验三维的VR视觉世界。本文介绍了基于图像的虚拟全景技术、全景摄影的技巧、无缝拼接处理技巧、网络发布技巧以及其在行业中的应用等。     

采用亚像素缝雕刻的图像整形算法

全景拼接得到的图像其边界往往是不规则的,绝大多数全景拼接算法选择直接对全景图像进行裁剪,以获得拥有矩形边界的标准图像,但这会丢失部分图像中的关键信息并以减小全景图像的视野为代价.针对以上问题,提出一种基于亚像素缝雕刻的图像整形算法.首先采用三次样条插值和图像修复算法对图像的不规则边界进行平滑;然后以图像当前边界和矩形目标边界位置之差的归一化值为权重,在0~1个像素范围内拉伸或压缩最优缝上的每一个像素,平移缝一侧的其他像素,以消除当前边界和目标边界的差异.实验结果表明,在保证图像内容的前提下,该算法将一幅边界不规则的全景图像整形成一幅边界规则的矩形图像,在处理边界起伏较大,特别是有显著内凹边界的全景图像时也能取得令人满意的效果.     

全景相机遥控器嵌入式软件V1.0相关操作分析

本文是针对全景相机遥控器嵌入式软件V1.0的详细说明以及针对全景相机的相关使用操作进行分析,文章以该软件的设计使用说明书为基本切入点,通过对该设计说明书中的相关设计思路以及使用说明进行分析解读,旨在为该全景相机的使用提供一定的便利。     

一种全景图像浏览器的设计与实现

全景图像存在几何畸变,全景图像浏览器的作用就是根据用户的视线方向以及观察焦距,对全景图像进行实时的畸变校正,提供给用户符合视觉习惯的局部图像.本文对现有的球面全景图像畸变校正算法进行了研究和改进,采用双线性插值、查询线性表等方法设计实现了一个高实时性、高精度的全景图像浏览器PanoViewer.     

基于三维世界的交互式管理信息系统研究

对基于三维世界的交互式管理信息系统进行了研究.采用3DSMAX建模与Virtools后期整合相结合的方法,提供给管理者在虚拟三维全景视图条件下对人员、设备设施及相应的日常工作情况进行精细化管理.同时,在Virtools阵列中根据管理部门人员的不同职别赋予不同的管理权限,通过脚本分组实现权限化的交互功能.提出管理员就是程序员的理念,通过为管理人员提供简单程序式按钮操作,实现对三维管理场景的自定义修改.     

基于相机云台技术的全景图像制作方法探究

当今三维全景虚拟现实技术正广泛应用于各领域,三维全景视图是构成虚拟现实场景的主要元素,而三维全景视图源于全景图像建模,因此,要获取逼真且完美无缺的虚拟现实场景,全景图像原始采集和后期拼接处理工作尤为重要.就通过搭建相机云台采集图像,拼接处理后生成高质量的全景图像方法进行了探究.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.     

Editorial: Special issue on recent advances in hybrid control theory and applications

正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where     

Information for Authors

正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.