CM9500系列视频矩阵的应用研究

目前,CCTV图像监视系统已广泛应用于银行、电信、交通监控、智能大厦等领域。CCTV图像监视系统的核心部件为视频矩阵,对视频矩阵的控制通常都是采用专用的操作键盘来实现,监视系统缺少灵活性和扩展性,同时系统的造价也较高。本文以PELCO公司的CM9500系列视频矩阵为例,提出一种灵活、低成本的解决方案。     

Finite element-based analyses of natural frequencies of long tapered hollow steel poles

Long tapered poles are commonly used to support Closed Circuit Television Cameras (CCTV) for security and traffic monitoring. Images received from CCTV are normally distorted due to the camera’s wind-induced vibration. To minimize the vibration experienced by the CCTV through development of a damping device to be placed at the interface between the pole and the camera, identification of the poles’ different frequencies as functions of poles’ geometric variables is essential. Thus, this study presents the development of natural frequency equations for long tapered hollow poles as functions of their geometric variables based on three-dimensional finite element model (FEM) analyses by taking into account the couplings between material, contact and geometric nonlinearities. The FEM results are compared and verified with the experimental data obtained from the instrumentation of a 60 ft pole. Sensitivity study is performed to identify the effect of different geometric parameters on the overall natural frequencies of the pole. Using the results from the parametric study, empirical formulae between the geometric parameters and the first, second and third mode natural frequencies for the long tapered hollow steel poles are obtained.     

基于分布式存储的车载视频监控解码终端的软件架构

基于分布式存储的轨道交通车载视频监控系统,针对解码显示终端,本文提出一种新的软件架构.该架构基于海思Hi3531核心板,结合JRTPLIB开源库,引入缓冲区动态调整机制,解决了传统车载视频监控系统出现频率较高的解码花屏等问题.实验结果显示,基于新架构下的解码显示终端较传统车载视频服务器,显示效果良好,长时间测试运行稳定,降低了解码问题出现几率.     

CCTV技术在马尾快安片区排水管道整治中应用

CCTV(管道闭路电视内窥检测)技术应用于排水管道管理和养护,能发挥巨大辅助决策作用。     

无人驾驶车辆CCTV系统整体解决方案

随着城市轨道交通的发展,全自动无人驾驶车辆已经成功地应用在城市轨道交通系统中.由于司机室里没有了司机,如果车辆在运行中发生什么情况,安装在客室和司机室的摄像机就充当了司机的眼睛,通过OCC的监控显示屏可以监控每个车辆的状态.该系统通过了运行试验,可以满足无人驾驶车辆对于车辆状态的监控要求.     

CCTV 技术在泗洪县城区排水管道检测中的应用

CCTV结合机器人的管道检测技术是一种智能化检测手段。本文利用该技术对泗洪县城区管道进行检测。结果表明,管道结构性缺陷在数量和严重程度上远超功能性缺陷;管道结构性缺陷主要是腐蚀、脱节、破裂,功能性缺陷则集中在树根和结垢。     

A Computer Modeling of the China Central Television Headquarters in Beijing

This paper deals with the computer modeling of structures starting from a point cloud. The CCTV （China Central Television） tower headquarters is the case for study because the shape of this building is non-stellar, concave and multi-connected. It is composed of sowns and chains. The sown is the representation of a horizontal plane formed by dense points. The chain is a planar path modeled by rare points. The CCTV structure is defined only by the three orthogonal Cartesian coordinates of the points. The proposed computer modeling uses a sequence of procedures and the desired outputted 3D model is consistent. The first procedure is devoted to attributing points to their voxel and to estimating three values needed afterwards. The second procedure is devoted to analyzing clusters vertically and horizontally, to preliminarily distinguishing chains from sowns and to generating relational matching. The third procedure is devoted to building closed paths between all chains and all their projections on sowns. The fourth procedure is devoted to connecting points with triangles. The fifth procedure, still being implemented, is devoted to interpolating triangles with triangular splines. The results show it is possible to achieve the 3D model using the above mentioned procedures. These procedures are written, implemented and tested and they form a library of people＇s own software. The code is written using Matlab. It is not possible to obtain the required 3D model if the procedures are applied in the wrong order or one step is skipped. To conclude, it is possible to obtain the computer model of the CCTV using the provided sequence of procedures.     

闭路电视监控系统在轨道交通中的集成与应用

结合轨道交通的特点,详细阐述了轨道交通车站、列车、控制中心等闭路电视监控系统的集成与功能实现,说明了轨道交通闭路电视监控系统对列车运营、治安管理、突发事件处置等方面的作用。     

CCTV新址特大型冷却水圆弧管道施工技术

CCTV新址工程采用集中制冷模式.服务楼环形屋面DN2000冷却水圆弧管道施工没有经验可借鉴,是施工难点.DN2000冷却水圆弧管道全部设置在结构钢筋混凝土基座上,预埋20mm厚钢板,由工字钢支架支撑.根据支架受力,选择合适的工字钢型号.采用计算机绘制管道放样图和下料放样图.管道安装完毕后用打磨机除锈,再用ECH-200酸洗镀膜剂镀膜,刷保护层后做电伴热橡塑保温,外包铝皮保护壳.     

Patterns,Fabrics, Prototypes,Tessellations

New technologies have enabled architects to develop sophisticated patterning techniques. This is epitomised by the expressive possibilities now available to the building envelope: smooth geometries, tessellation, material textures and layers, such as solar shading. For Alejandro Zaera-Polo of Foreign Office Architects, though, patterns have cultural and political possibilities far beyond mere decoration, enabling new practices to address in the urban context some of the crucial problems posed by globalisation: bridging the dichotomy between tabula rasa and contextualism, and the articulation between the local and global. Copyright © 2009 John Wiley & Sons, Ltd.