Filtering Multi‐Layer Shadow Maps for Accurate Soft Shadows

In this paper, we introduce a novel technique for pre‐filtering multi‐layer shadow maps. The occluders in the scene are stored as variable‐length lists of fragments for each texel. We show how this representation can be filtered by progressively merging these lists. In contrast to previous pre‐filtering techniques, our method better captures the distribution of depth values, resulting in a much higher shadow quality for overlapping occluders and occluders with different depths. The pre‐filtered maps are generated and evaluated directly on the GPU, and provide efficient queries for shadow tests with arbitrary filter sizes. Accurate soft shadows are rendered in real‐time even for complex scenes and difficult setups. Our results demonstrate that our pre‐filtered maps are general and particularly scalable.     

一种自学习阴影检测方法

提出一种实时学习的阴影检测方法,该方法无须用户提供监控场景信息或设定任何阈值,而是根据统计的技巧来自我学习该场景的阴影特性,进而达到阴影检测的目的。仿真结果表明,该方法可有效地实现阴影检测,并具有较强的自适应性和实时性。     

基于计算机视觉的高速路面状态检测方法

路面状态检测技术是辅助高速公路监管部门及时发现结冰、积雪等不良路况的重要手段。针对传统基于硬件设备的路面状态检测技术存在成本较高、检测范围受局限等问题,提出了一种基于计算机视觉的高速路面状态检测方法。该方法首先将融合了空间注意力机制和通道注意力机制的Attention模块与具有高分割精度的U-Net网络相结合,对路面区域图像进行分割提取;之后实现了一种基于循环生成对抗网络的路面阴影消除算法,对已经提取的路面图像进行阴影消除;最后基于残差结构构建了路面状态分类器,实现高准确率的路面状态检测。实验结果表明,采用该方法可以消除路面状态检测过程中高速公路两侧景物和路面阴影对状态检测带来的干扰,实现了对路面干燥、积雪、积水和结冰4类状态的准确识别。基于高速公路监控视频进行测试时,识别率可达97.9%。     

工业现场网络SINECL2及其应用

详细介绍了西门子工业现场总线SINECL2网络的特点及其技术规范 ,以及在显示器平板荫罩生产线监控系统中的应用 ,同时介绍了西门子通信组态软件COROS的应用     

一个交通规划场景漫游系统

文章所述的交通规划场景漫游系统可根据平面交通规划方案生成三维仿真规划场景,并允许用户实时地漫游其中以观察规划效果,从而简化了规划流程,提高了劳动效率。文中介绍了系统的总体结构、操作流程和核心数据结构,同时着重讨论了系统中的体影分离渲染、不完全场景空间分割、四叉树结构的场景管理模式等多项关键算法技术。     

Recent developments in large‐area photomasks for display applications

One of the most critical areas in the manufacturing process for FPD panels or shadow masks for CRTs is lithography. Most existing lithography technologies require high‐quality large‐area photomasks. The requirements on these photomasks include positioning accuracy (registration) and repeatability (overlay), systematic image quality errors (“mura” or display quality), and resolution (minimum feature size). The general trend toward higher resolution and improved performance, e.g., for TFT desktop monitors, has put a strong focus on the specifications for large‐area‐display photomasks. This article intends to give an overview of the dominant issues for large‐area‐display photomasks, and illustrates differences compared with other applications. The article will also present state‐of‐the‐art methods and trends. In particular, the aspects of positioning accuracy over large areas and systematic image‐quality errors will be described. New qualitative and objective methods have been developed as means to capture systematic image‐quality errors. Results indicating that errors below 25 nm can be found early in the manufacturing process is presented, thus allowing inspection for visual effects before the actual display is completed. Positioning accuracy below 400 nm (3 sigma) over 720 × 560 mm have been achieved. These results will in the future be extended up toward 1 × 1 m for generation 4 in TFT‐LCD production.     

关于"可移动Agent系统位置透明通信的一种实现"的一点注记

王红等人的文章“可移动Agent系统位置透明通信的一种实现”的结论是值得商榷的。文中指出该文的不足及欠明晰之处,对其结论进行了澄清。     

基于BSP算法和模板缓存的阴影实现方法

阴影的生成在体现虚拟现实环境的真实感程度方面起着重要的作用。随着支持模板缓存的3D加速图形卡在个人计算机市场上的普及，使得用采用模板缓存的影域多边形算法来实现实时动态阴影成为可能。综合BSP算法以及OpcnGL中的模板缓存，提出了一种实时生成三维阴影的算法。     

陕西西路皮影造型的流变

皮影在我国有着悠久的历史。相传自汉代就已产生,据可靠的史书记载最早见于宋代。陕西西路皮影最早出现在清初,到晚清进入鼎盛时期。从产生至今,西路皮影造型经历了漫长的传承和发展过程。进入21世纪后,皮影这一古老的民间艺术受到了现代传媒的巨大冲击,语境逐渐丧失,渐渐濒临消失的边沿。如何抢救、挖掘和整理这一宝贵的民间造型艺术,在今天仍具现实意义。     

基于Fluent的超声波换能器测风阵列模型改进研究

针对垂直相交型阵列易受阴影效应影响的问题,根据时差法原理,采用三组超声波换能器互成120°放置,设计了一种具有三条独立测风路径的改进型测风阵列,并建立了风速计算模型。该阵列保证至少有两组换能器正常工作的前提下,对某一条受到绕流干扰严重的测风路径进行校正。利用SpaceClaim软件建立测风阵列及风洞模型,通过Meshing软件进行网格划分,使用FLUENT软件改变模拟风洞内的风速及雷诺数等指标,仿真两种阵列在不同流态下的性能表现,得到速度分布云图以及测风路径速度曲线图,说明了改进型测风阵列能明显提升测风精度。