基于Canny边缘检测算子的雷达图像1/8插值改进算法

雷达扫描图像的图像信息单一,大部分为黑色背景,运用传统的1/8图像插值算法放大显示不仅运算复杂度高,处理延时大,而且会使雷达目标航迹的图像边缘十分模糊,难以得到满意的视觉效果。为此,结合Canny算子检测雷达扫描图像的边缘,提出了一种雷达图像1/8插值改进算法。实验结果表明,经本文算法插值放大的雷达扫描图像的目标边缘清晰,且算法复杂度较低,便于硬件实现,可实现实时图像缩放。目前该算法已成功应用于雷达站某系统的图像处理模块。     

A DEM‐based parallel computing hydrodynamic and transport model

The sudden and accidental water pollution response system (SAWPRS) for Yangtze River in central China required to develop a hydrodynamic and transport model, which is readily available and capable of simulating a large river system within GIS environment. This study facilitates such effort by developing a parallel computing method based on digital elevation model (DEM) using overlapping domain decomposition approach (ODDA) and message passing interface (MPI) protocol. The hydrodynamic and transport model was redesigned using finite volume method for hydrodynamic and transport model dispersion, the SIMPLEC method for solving the flow field, and the pressure weighted interpolating method for the flow field modification. This modelling approach was verified in two experiments using different sets of computer clusters. The model output was evaluated against the measured data collected for the year 1998 for Wanzhou, an upstream river segment of Yangtze River. The relative error was found to be less than 10%. The performance of parallel computation was found excellent as evident from the cost efficiency values greater than 0.81 in both experiments and increased computation speed while increasing the number of computer clusters. Overall, the parallel computing modelling system developed here was found to meet all requirements of SAWPRS. Copyright © 2010 John Wiley & Sons, Ltd.     

水利工程视频监控系统建设与技术支撑

结合国家防汛抗旱指挥系统二期工程视频监控系统初步设计,讨论水利工程视频监控系统建设的必要性,介绍水利工程视频监控系统的建设思路、基本结构及组成、系统主要特点,结合当前平台架构、云计算、物联网等IT领域最新技术的发展与应用,分析视频监控系统的发展方向和应用前景,为水利工程视频监控系统的建设提供技术参考.     

滑坡滑动前后稳定性分析及治理方案

某水电站引水线路通过一高阶地前缘滑坡体,前期勘察时对该滑坡稳定性进行过稳定分析,但未作有效支挡处理,渠道施工开挖2 a后发生滑动,对渠道造成严重破坏,并推迟发电日期。滑动后对滑坡体进行了勘察和稳定性分析,估算出支挡结构断面处的下滑推力,并提出治理建议,为滑坡治理设计提供了可靠依据。     

Issues in software ergonomics: user interface design and Chinese computing input methodology

This paper provides an overview of two ongoing research projects at the Institute of Systems Science (ISS). In the intelligent user interface project, the use of artificial intelligence in enhancing human-computer interaction is discussed. In the Chinese computing input methodology project, an input methodology derived from studies in cognitive psychology is discussed.     

Chaos emerged on the ‘edge of chaos’

Rule 110 is a complex cellular automaton (CA) in Wolfram's system of identification, capable of supporting universal computation. It has been suggested that a universal CA should be on the ‘edge of chaos’, which means that the dynamical behaviour of such a system is neither simple nor chaotic. There is no doubt that the dynamical property of Rule 110 is extremely complex and still not well understood. This paper proves the existence of subsystems on which this rule is chaotic in the sense of Devaney.     

Cloud computing adoption and usage in community colleges

Cloud computing is gaining popularity in higher education settings, but the costs and benefits of this tool have gone largely unexplored. The purpose of this study was to examine the factors that lead to technology adoption in a higher education setting. Specifically, we examined a range of predictors and outcomes relating to the acceptance of a cloud computing platform in rural and urban community colleges. Drawing from the Technology Acceptance Model 3 (TAM3) (Venkatesh, V. and Bala, H., 2008. Technology Acceptance Model 3 and a research agenda on interventions. Decision Sciences, 39 (2), 273–315), we build on the literature by examining both the actual usage and future intentions; further, we test the direct and indirect effects of a range of predictors on these outcomes. Approximately 750 community college students enrolled in basic computing skills courses participated in this study; findings demonstrated that background characteristics such as the student's ability to travel to campus had influenced the usefulness perceptions, while ease of use was largely determined by first-hand experiences with the platform, and instructor support. We offer recommendations for community college administrators and others who seek to incorporate cloud computing in higher education settings.     

基于多源信息的阴影检测

阴影检测在车辆检测中具有关键作用。针对目前车辆检测算法中阴影常被误检为前景目标的问题,提出了一种基于多源信息的阴影检测算法。首先进行前景目标的提取;然后分别进行基于边缘、HSV颜色空间和光学不变性信息的阴影检测;最后根据三种信息检测结果的综合分析确定阴影点。实验结果表明,该算法具有很好的阴影检测效果。     

改进的倾斜刃边法获取边缘扩展函数

在倾斜刃边法的基础上提出了一种改进的用于获取边缘扩展函数的方法。该方法采用改进的Hough变换获取目标边缘的倾斜角度,用几何投影的思路来获取边缘扩展函数的数据,用5点滤波平滑处理得到了最终的边缘扩展函数。实验通过对理想倾斜刃边图像创建人工模糊,对模糊化后的图像分别用改进的Hought变换和直线拟合计算倾斜角度,并将结果进行对比,验证了该方法的准确性和快速性;再将得到的边缘扩展函数数据用于计算MTF值并与理论值进行对比,验证了本方法获取边缘扩展函数数据的准确性。     

快速随机Hough变换多直线检测算法

直线检测是计算机视觉和模式识别领域内的一项重要任务.针对现有随机Hough变换直线检测算法的无效采样量大、计算速度慢等缺点,在随机采样过程中提出了一种新的采样策略.我们先根据所有边缘点梯度方向的统计分布特征确定潜在直线的主方向,再通过设定的阈值消除K个分组边缘点集中对直线检测毫无贡献的点集.这样,不仅约束了随机Hough变换的采样范围,也减少了在随机采样过程中大量的无效采样,还使得算法速度得到提高、存储减少.最后通过仿真从检测单条和多条直线两方面出发对本文算法性能进行了分析.实验结果表明:算法能在实际噪声图像中快速提取出所有目标直线,对离散误差、局部断裂等缺陷不敏感,直线检测准确率也得到提高.