创新项目

拼卡通3D动漫桌面工具一句话描述:拼卡通是一款集3D动漫短片制作,分享和聊天功能的桌面工具体验地址:http://www.pktoon.cn/拼卡通能够让用户像搭积木一样,无须专门学习,无须专业知识,非常简单地创作3D动画短片。     

基于多投影的多视点自动立体三维显示系统

多视点自动立体显示有望成为今后主流的三维显示技术,它是一种无需借助任何辅助观察设备的多视点、多观察区、高分辨率、显示效果逼真的三维显示方式。阐述了基于多投影的多视点自动立体显示系统的设计原理,详细地描述了系统的软硬件构架,建立了基于多投影仪和水平光学各向异性显示结构的自动立体显示样机,开发了投影仪阵列自动校准系统,提高了投影仪的校准精度,避免了因投影仪数目多而导致的繁琐的校准过程。实验结果能够给观众带来逼真的三维视觉体验。     

第三代分布式UNIX操作系统：蜂窝式操作系统Cellular IRIX

CellularIRIX具有把大型主机和分布式桌面系统结合在一起的优点。六十年代的大型机和七十年代的超级小型机对于它们的用户群体来说是一个统一的共享资源：相对来说管理简单而且易于优化到最大的吞吐量。在二十世纪八十年代，半导体技术方面的进步降低了计算机的成本；各种桌面工作站和个人计算机不断增长。随着桌面计算机专门面向个人，计算环境的可扩展性也随之增加，计算频率能够不断增长成本不断下降，可用性也可以提高。任何一台桌面计算机失效不会影响其它的机器，如果邮件或文件在一台单独的服务器上，用户能够把它们从一台很坏的桌…     

语义桌面环境下一种基于概念图的文档检索方法

语义桌面作为语义Web的一个重要分支,可以为个人计算机用户提供丰富的元数据,用以记录桌面文档的各种特征。这些特征包括文件的常规属性和与用户行为相关的属性,它们为桌面文档检索提供帮助。受到"概念图"理论的启发,本文提出了一种语义桌面环境下的文档检索算法。该算法能有效地利用语义桌面提供的元数据建立一种便于快速查找的文档索引结构,迅速地确定用户查询与桌面文档之间的投影算子。实验表明,该算法的时间效率比以往的基于匹配推理的投影算法有很大的提高,可以在很大程度上满足用户对桌面文档进行快速检索的需求。     

基于机群的拼贴显示系统的软件结构

利用计算机系统控制多个图形部件,驱动多个投影仪得到基于投影拼贴的显示,是突破现有显示技术制约,实现千万像素以上的高清晰度大尺寸显示的有效手段。目前采用PC机群系统来驱动拼贴显示系统的方式由于其较高的性能价格比正日益成为主流的选择,但是这种实现方式同时需要更复杂的分布式显示软件的支持。该文分析比较了几种基于机群的拼贴显示系统的软件结构并在此基础上提出了一种新的适合并行程序环境的软件接口。     

多投影仪自由立体显示的GPU几何及亮度校正技术

由多个投影仪拼接显示的自由立体显示系统有很大的显示区域,能够产生更好的立体显示效果.针对可伸缩高分辨率多投影仪自由立体显示的系统特性和屏幕特性,通过分析各种几何校正和亮度校正算法,采用二次几何校正方法解决了自由立体显示中斜投影造成的部分特征点不在屏幕上的问题;提出了基于GPU的亮度自适应多模板校正方法,并通过GPU程序...     

D3DPR:基于Direct3D9的并行图形绘制系统

根据Direct3D9图形库的特征,提出了支持Direct3D9应用程序级透明并行图形绘制系统D3DPR的系统结构及其实现原理.D3DPR分为资源分配和资源绘制2类逻辑节点.通过资源分配节点并行图形库DPGL的截取技术和资源绘制节点的重构技术,任何单机的Direct3D9应用程序都不需要经过修改即可实时转变为由PC集群并行绘制,从而得到更高的绘制性能和高分辨率的多屏拼接显示效果,为用户提供具有更强真实感和沉浸感的虚拟环境.     

精彩投影三部曲

在"笔记本+投影仪"日渐成为大多数学校信息化教学环境标准配置的背景下,如何让投影演示更加精彩、高效,成为衡量教师信息化素养的重要指标之一。设置使用扩展显示模式在Windows7系统下,开启投影仪并将投影仪线缆连接到笔记本电脑的VGA视频端口之后,按下"Windows徽标键+P",笔记本桌面上就会出现"仅投影仪"(即投影仪显示笔记本桌面,     

喷打“显示”新活力

在不少用户的印象中,3D立体显示就是佩带特制的眼镜去观看电影或显示屏幕。近来出现的3D立体显示技术,大都属于裸眼3D显示技术。观众无需戴上专用眼镜等附加设备,就可以看到真正的立体图像。     

RFRTOS:基于Linux的实时操作系统

随着实时应用领域的逐渐扩大,不仅传统嵌入式系统的需求日益紧迫,而且这种情况也渗透到桌面环境.为了满足国内用户在这方面的广泛需求,基于红旗Linux操作系统,开发了RFRTOS实时操作系统.主要从实时调度策略、内核抢占机制、细粒度定时器几方面讨论了RFRTOS的实时支持.实验结果表明,所作改进有效地提高了Linux的调度精度,满足了软实时方面的需求.     

Distributed real-time rendering for ultrahigh-resolution multiscreen 3D display

Large-scale autostereoscopic three-dimensional (3D) displays can give audiences a truly immersive feeling with strong visual impact. However, the traditional autostereoscopic 3D display systems are limited by the display hardware, making it difficult to directly achieve large-scale 3D displays with high resolution. Multiscreen splicing with laser backlights can be used for large-scale and ultrahigh-resolution 3D display, but it normally results in subscreen image asynchronization, view zone error, or obvious edge overlapping. To solve the problems mentioned above, a distributed real-time rendering system for ultrahigh-resolution multiscreen 3D display is proposed. Fifteen 3D LCD display devices are driven through a host, cooperating with laser backlights, a lenticular lens array (LLA), and a directional diffuser to display high resolution, high frame rate, large size, and wide-viewing angle 3D images. The resolution of the whole display system can reach 23,040 × 21,600. The rendering system provides a large-scale and real-time 3D scene image with an ultrahigh-definition resolution at a speed of 40 frames per second and high quality.     

基于集群的Web并行超高分辨率显示技术

如何有效地快速显示超高分辨的互联网资源一直是卫星遥感、城市环境监控预警、智慧城市管理中心等领域的研究热点和难点.本文提出了一种基于集群的Web并行超高分辨显示技术,完美结合Web技术和集群并行处理技术,克服了传统集中信息处理显示和采用DLP投影拼接技术存在显示分辨率有限、系统拼接困难、信息显示处理速度慢、无法异地共享显示等问题,实现Web资源的实时超高分辨显示.通过对比实验,本文研究的基于集群的Web并行超高分辨率显示技术能够高效地、高清晰度的显示网页资源,为海量的Web信息内容的实时、超高分辨显示提供了有效的解决方案.     

A geoscience perspective on immersive 3D gridded data visualization

We describe visualization software, Visualizer, that was developed specifically for interactive, visual exploration in immersive virtual reality (VR) environments. Visualizer uses carefully optimized algorithms and data structures to support the high frame rates required for immersion and the real-time feedback required for interactivity. As an application developed for VR from the ground up, Visualizer realizes benefits that usually cannot be achieved by software initially developed for the desktop and later ported to VR. However, Visualizer can also be used on desktop systems (unix/linux-based operating systems including Mac OS X) with a similar level of real-time interactivity, bridging the “software gap” between desktop and VR that has been an obstacle for the adoption of VR methods in the Geosciences. While many of the capabilities of Visualizer are already available in other software packages used in a desktop environment, the features that distinguish Visualizer are: (1) Visualizer can be used in any VR environment including the desktop, GeoWall, or CAVE, (2) in non-desktop environments the user interacts with the data set directly using a wand or other input devices instead of working indirectly via dialog boxes or text input, (3) on the desktop, Visualizer provides real-time interaction with very large data sets that cannot easily be viewed or manipulated in other software packages. Three case studies are presented that illustrate the direct scientific benefits realized by analyzing data or simulation results with Visualizer in a VR environment. We also address some of the main obstacles to widespread use of VR environments in scientific research with a user study that shows Visualizer is easy to learn and to use in a VR environment and can be as effective on desktop systems as native desktop applications.     

Construction of feature-matching perception in virtual assembly

An important characteristic of virtual assembly is interaction.Traditional direct manipulation in virtual assembly relies on dynamic collision detection,which is very time-consuming and even impossible in desktop virtual assembly environment.Feature-matching is a critical process in harmonious virtual assembly,and is the premise of assembly constraint sensing.This paper puts forward an active object-based feature-matching perception mechanism and a feature-matching interactive computing process,both of which make the direct manipulation in virtual assembly break away from collision detection.They also help to enhance virtual environment understandability of user intention and promote interaction performance.Experimentl results show that this perception mechanism can ensure that users achieve real-time direct manipulation in desktop virtual environment.     

Tools for code optimization and system evaluation of the image processing system PAPRICA-3

This paper presents the complex environment that was built to ease the prototyping of real-time applications on the PAPRICA-3 massively parallel system. Applications are developed in C++ using high level data types and the corresponding Assembly code is automatically created by a code generator. A stochastic code optimizer takes the assembly code and improves it according to a genetic approach; due to the high computational power required by this approach, the stochastic code optimizer was implemented with MPI and runs in parallel on a cluster of workstations. The availability of this complex environment allowed to test the performance of the system and to tune it according to some target applications before the actual development of the hardware. For this purpose a system-level simulator was also built to determine the number of clock cycles required to run a specific segment of code. The whole environment has been used to validate possible solutions for the hardware system and to develop, test, and tune several real-time image processing applications. The hardware system is now completely defined.     

A Platform for User-Tailored Interaction Development in 2D, 3D, and VR

The discussion on the advantages and disadvantages of 2D, 3D, and VR interfaces and their applicability to different types of systems, users, and information led to a series of stand-alone implementations that lack the possibility of realizing an integrated approach. The acceptance of the different interaction techniques will depend on their success in practical applications, i.e. with systems that are used by different users for different purposes. Since this acceptance is especially hard to achieve in computer-critical environments, such as medicine, we developed a software environment that allows for the development, integration, and user-centered evaluation of existing and new interaction techniques for their use in medical applications. This environment is equipped with an innovative message-passing functionality that provides the communication to and among application objects in 2D, 3D, and VR. Furthermore, the environment contains a component for user-adapted interaction and system support at runtime.     

GIS系统地图快速显示模型设计与实现

随着高性能移动设备和Internet的普及,GIS的应用已突破传统领域向着嵌入式和网络化的方向快速发展,基于特定系统,特定环境的GIS系统开发已成为业界的研究热点.在对ESRI公司的地图文件结构和实时地图显示技术分析的基础上,建立了一个适于特定要求的GIS地图快速显示模型,并在Windows 2000和Win CE.Net系统环境下实现了该模型.     

Flexible Soft Real-Time Processing in Middleware

As desktop computer computational power continues to increase dramatically, it is becoming commonplace to run a combination of deadline-sensitive applications. Despite the proliferation of computational power, the detailed nature of these applications causes new problems for the system resource allocation mechanisms. First, these applications are designed to meet their deadlines as long as nearly all the system's resources are available to them; once the system approaches saturation, the collective applications will fail to meet their deadlines. To aggravate the situation, conventional best effort managers will allocate resources to the competing applications based on a static form of equitability rather than addressing the dynamic relative benefit provided by each application. Second, the applications differ from conventional real-time applications: though members of this new class of desktop applications are sensitive to deadlines, their constraints are non-critical. They are also typically designed to use the full spectrum of functions provided by a general purpose system call interface rather than the more limited interface of a real-time operating system (OS). This paper describes a flexible soft real-time system design that addresses these two problems. The CPU scheduling strategy accommodates the community of applications by taking application benefit into account during times of heavy load. Applications are written to use the full interface of a general purpose system call interface, yet the system is able to schedule them according to their deadlines and resource reservation and availability. This paper describes the theoretical foundation of the approach, additional application responsibilities, the design of a middleware system to implement the approach, and then it presents an extensive set of experimental studies that demonstrate the behavior of the approach. The Dynamic QoS Manager middleware (implemented on top of two different versions of Unix), is shown to be a highly effective system for supporting contemporary soft real-time desktop applications.