面向浏览器的医学影像可视化系统

目的 当前各大商业公司和开源社区所提供的医学影像可视化系统依赖于各类平台以及与平台相关的插件,难以实现跨平台访问.为此提出并实现了基于HTML5的面向现代浏览器的医学影像可视化系统.方法 基于B/S(browers/server)模式进行系统整体架构与设计,设计自定义的传输协议提供各种定制的图像可视化服务.对于2维影像,采用HTML的canvas技术和WebGL技术进行浏览器端硬件加速.对于3维医学影像,采用前后端异步操作的策略以提供渐进式可视化.算法构造原始数据的多分辨率采样,并在用户交互过程中实现自适应可视化.结果 在不同的浏览器、多组临床医学影像肝脏数据上测试了系统,表明系统支持跨浏览器的可视化.测试2维和3维可视化的结果表明,系统支持2维影像的实时可视化(25帧/s),支持3维影像的交互可视化.对于512×512×154的医学体数据,低精度绘制模式的可视化效率可以达到60帧/s,高精度绘制模式的可视化效率可达到 1帧/s 的绘制效率.结论 本文面向浏览器的医学影像可视化系统利用当下新兴的WEB技术实现了跨浏览器、跨平台地对用户提供服务,为远程及移动医疗影像可视化系统提供了机会.     

基于HTML5网页地图浏览器的开发与应用

HTML5（超文本标识语言第5版）新类型网页元素提高了应用服务设计水平及扩展性,可以利用HTML5和CSS3（层叠样式表3版）等新元素开发可移动网页地图浏览器的软件外观与框架结构并增强网页地图服务功能,实现应用功能与结构升级的目的。通过模块集成方法完成主体框架结构设计,即三部分主要模块结构：图标命令工具模块、容器结构模块和预置的网页地图模块部分和可缩放触柄与状态栏模块。其最大空间结构是盛装网页内容的容器模块,所装载的网页地图或网页内容同步更新功能以及内置可重复调用坐标输入对话框。经反复测试能完全实现设计功能,截图说明其效果。该地图浏览器既能应用网页地图操作服务又可浏览互联网IP网页。     

基于HTML5的Web应用研究

互联网的发展使得Web应用需求日益增大,HTML5标准的发布让用户体验到更为丰富的Web的应用。分析了HTML5技术的新特性,着重对HTML5在数据存储,视频音频播放以及Canvas画布等核心技术进行了分析,并研究了这些技术在Web开发中的应用,最后总结探讨了HTML5未来的发展。     

A resource integration approach for HTML5 mobile applications

As the new HTML5 specification is being accepted, comprehensive HTML5-based mobile applications provide users with better experiences. Huge amount of existing Internet-based resources are rapidly integrated into mobile applications based on HTML5. However, this could result in some difficulties in adapting the resources into various types of existing mobile devices. To enhance the utilization of existing HTML5 based Internet resources into various mobile terminals, this paper proposed a new integration approach for mobile web applications, which can assist application service providers to provide HTML5-based mobile hybrid applications for various types of mobile ends. It is a novel attempt to quickly transplant huge emerging HTML5 Internet resources into mobile applications accepted by various mobile terminals. This work also examines necessary mechanisms and means to support the proposed framework seamlessly working with existing infrastructures. Finally, a prototype integration platform is built and comprehensive simulations are implemented to test and prove its high feasibility.     

基于HTML5的3D多人网页游戏实现方案

HTML5标准增强了网页在图形绘制、媒体播放、消息传送等方面的能力,为提高网页游戏性能创造了条件.基于该标准开发出一个3D多人网页游戏.介绍了其实现方案,测试了其相关性能,分析了该技术的可行性.     

基于HTML5的响应式展会信息移动平台设计与实现

响应式网页设计是针对不同尺寸移动设备而诞生的技术,该技术很好地解决了由于不同尺寸设备引起的错误问题。在移动设备成为大众获取信息的主要渠道的背景下,结合展会信息服务,应用响应式网页设计技术,设计并实现了一个展会信息移动平台,该平台的构建为展会信息的传播和商家供求信息的发布提供了一条便利的途径,对促进中小企业的发展具有重大现实意义。     

基于HTML 5技术的Widget引擎内容缓存模型及实现*

针对移动Widget无法脱机访问或网络延迟现象严重问题,提出了一种基于HTML 5.0技术的移动Widget引擎内容缓存模型,将网络端数据进行智能的下载和存储,通过使用HTML 5.0技术,合理地安排各种移动Widget应用的网络数据;同时根据用户的访问信息和移动Widget技术的原理特性,使用缓存淘汰策略、充分利用缓存空间使系统具有较好的性能.最后通过实验验证该模型可以有效解决Widget脱机访问和网络不良问题,从而提高访问速度和减少数据流量、节省终端电量和资源的消耗.     

基于HTML5的三维思维导图软件开发技术研究

针对目前开发思维导图编程语言众多,但跨平台3D建模思维导图软件较少的情况,本文从HTML5方面,利用SVG技术、Canvas技术、X3D技术和Web GL技术验证了整个分析方法的有效性和可行性,扩展了思维导图的可视化显示途径。此外利用WebGL开源框架如Three.js等可以调用Web GL着色器,实现3D网页渲染效果。不用借助专业的3D设计工具,直接通过HTML5页面就能进行3D建模思维导图。对思维导图软件的开发提供一种新的解决思路。     

三维仿真数字小区系统的实现

针对房地产行业的特点,运用虚拟现实技术对小区中的建筑物、道路以及室内场景进行三维建模和情景仿真,构建数字化小区系统,把真实的场景模拟出来。系统实现了室外漫游、室内漫游、虚拟装修等功能,为购房者、业主和开发商提供了一个交流的平台。     

A system for 3D texture-based probabilistic object recognition and its applications

This article presents a system for texture-based probabilistic classification and localisation of three-dimensional objects in two-dimensional digital images and discusses selected applications. In contrast to shape-based approaches, our texture-based method does not rely on object features extracted using image segmentation techniques. Rather, the objects are described by local feature vectors computed directly from image pixel values using the wavelet transform. Both gray level and colour images can be processed. In the training phase, object features are statistically modelled as normal density functions. In the recognition phase, the system classifies and localises objects in scenes with real heterogeneous backgrounds. Feature vectors are calculated and a maximisation algorithm compares the learned density functions with the extracted feature vectors and yields the classes and poses of objects found in the scene. Experiments carried out on a real dataset of over 40,000 images demonstrate the robustness of the system in terms of classification and localisation accuracy. Finally, two important real application scenarios are discussed, namely recognising museum exhibits from visitors’ own photographs and classification of metallography images.     

基于HTML 5的校园网应用系统的探讨

作为下一代Web应用标准的HTML 5,更加注重Web应用和表现及在移动Web平台良好的用户体验。HTML 5的浏览器/服务器的开发模式、对多媒体标签功能的支持以及在移动应用跨平台性等优势,对基于传统技术的校园网应用系统来说,在开发和使用中都有了很大改进。通过对HTML 5新特性和在校园应用系统优势的分析,旨在为校园网应用系统的开发提供新思路。     

A robust and flexible digital rights management system for home networks

A robust and flexible Digital Rights Management system for home networks is presented. In the proposed system, the central authority delegates its authorization right to the local manager in a home network by issuing a proxy certificate, and the local manager flexibly controls the access rights of home devices on digital contents with its proxy certificate. Furthermore, the proposed system provides a temporary accessing facility for external devices and achieves strong privacy for home devices. For the validation of delegated rights and the revocation of compromised local managers, a hybrid mechanism combining OCSP validation and periodic renewal of proxy certificates is also presented.     

An easy-to-use 3D visualization system for planning context-aware applications in smart buildings

With the proliferation of wireless sensor network technologies, the context-aware applications of smart environments have become more and more popular. However, time-consuming and labor-intensive works hamper the development of smart building applications. Therefore, application developers need the proper software platforms to efficiently design the applications. Much research currently proposed the design approaches based on low-level concerns and the real-world deployments based on high-level programming abstraction are rare. Accordingly, the pressing issue is how to offer the easy-to-use tools with acceptable performance to rapidly and easily design the application scenarios for non-technical application users. Therefore, this study focuses on the application-layer simulation to propose a Visualization System of Context-aware Application Scenario Planning (VS-CaSP) for assisting non-technical developers and end-users in rapidly and easily designing the application scenario of smart buildings and in performing the acceptable and predictable simulation and evaluation. VS-CaSp applies rule-based and 3D visualization techniques to offer a 3D authoring environment integrated with real Zigbee sensor devices, where designers are able to rapidly construct immersive 3D buildings and easily plan the context-aware application scenario via GUI tool based on proposed three-tier rule hierarchy, to visually simulate and verify the planned scenario via virtual and real sensor devices, and to repeatedly modify the control strategies to enhance the deployment effectiveness. The experimental results show that VS-CaSP is easy to use for the support of quickly designing smart building applications, but not professional enough for developments of 3D modeling, animation, and rule expression. Accordingly, it is workable and expected to prove beneficial to non-technical users.     

3D digital cinema technologies

We describe fundamental aspects of the two major digital cinema projector platforms with special regard to the needs of 3D cinema. We present several optical solutions for 3D digital cinema, including polarization‐converting modulators, over‐under lenses, and dual projector systems. Finally, we define a metric for 3D efficiency and compare several solutions on this basis.     

Integration of 3D dynamic models being created by 3D machine vision system into telerobotics applications

State of the art and outlook of machine vision systems for telerobotics are overviewed. A project of integration of compression and streaming functions for threedimensional dynamic model data being obtained from a three-dimensional machine vision system into a distributed robotic system is discussed.     

Use of HTML forms in complex user interfaces for server-side applications

It is now commonplace to use forms within HTML documents to have server-based applications interact with remote users. However, these forms are, most of the time, rather simple and only allow a one time interaction between the user and the application. Forms are nevertheless very versatile and can be used to build rather complex user interfaces for server-side applications that involve multiple interaction loops. In this paper, we describe how our students used such forms to remotely control a symbolic debugger executing algorithms in the on-line version of a book used in their data structure course. After describing in detail how the user interface is built and how the students can interact with it, we focus on the limitations of this approach and how this interface could be enhanced with the use of more recent developments such as applets.     

3D virtual apparel design for industrial applications

The integration of physics-based models within CAD systems for garment design leads to highly accurate cloth shape results for virtual prototyping and quality evaluation tasks. To this aim, we present a physics-based system for virtual cloth design and simulation expressly conceived for design purposes. This environment should allow the designer to validate her/his style and design option through the analysis of garment virtual prototypes and simulation results in order to reduce the number and role of physical prototypes. Garment shapes are accurately predicted by including material properties and external interactions through a particle-based cloth model embedded in constrained Newtonian dynamics with collision management, extended to complex-shaped assembled and finished garments. Our model is incorporated within a 3D graphical environment, and includes operators monitoring the whole design process of apparel, e.g. panel sewing, button/dart insertion, multi-layered fabric composition, garment finishings, etc. Applications and case studies are considered, with analysis of CAD modelling phases and simulation results concerning several male and female garments.     

Active optical 3D imaging for heritage applications

High-resolution 3D imaging and modeling is an important application in the heritage field. We describe several demonstration projects conducted in collaboration with museums and conservation agencies     

基于Web的3D智能家居系统设计与实现

给出了基于Web的3D智能家居系统的构架方案,结合了当前的前沿技术,详细介绍了智能家居系统的软件技术设计和硬件搭配。3D虚拟现实技术使得虚拟场景与家庭实景保持同步,同时,用户能够获得三维漫游沉浸感。实现了三维虚拟实景再现的技术,并人性化地构建出三维人机交互界面,实现家庭场景的远程再现,使用户在沉浸于虚拟现实环境中的同时完成各种远程监测与控制。