同源视频Copy-Move篡改检测及恢复

针对同源视频序列的copy-move篡改方式, 提出一种通过度量图像内容间的相关性, 来实现对视频序列的copy-move篡改检测并恢复的方法. 首先将视频帧内容转化为一系列连续的图像帧, 对图像分块, 提取每帧图像的8个特征矢量, 再利用欧氏距离计算帧间相关性, 并通过添加偏差矩阵构造动态偏差阈值, 检测出copy-move篡改序列且精确至帧, 从而实现对视频序列的篡改检测与恢复. 实验表明, 该算法对同源视频序列的copy-move篡改检测及恢复能够取得理想的效果.     

电动物流车远程监控系统

设计了一种电动物流车远程监控系统．该系统综合运用全球卫星定位系统（GPS）、公共移动通讯网（GPRS）、互联网（Intemet）和地理信息系统（GIS）等技术,对运行车辆状态和位置进行实时监控．系统的主控制器采用XC2267单片机,对GPS定位模块接收的车辆位置信息和CAN总线采集的车辆实时运行数据进行处理,然后通过GPRS网络将数据发送到中心服务器上,客户端或者充电站可向数据中心请求发送数据并在界面上显示．     

计算机动态模拟方法在城市交通噪声监测中的应用

阐述城市道路交通噪声高污染区域的监测与模拟研究。实现基于微观交通仿真的交通噪声动态模拟方法,采用该方法对峡谷型道路十字交叉口和公交车站两类典型的城市道路交通噪声高污染区域进行了动态模拟,同时对这两类区域的交通噪声进行了实地监测。监测结果和模拟结果的对比表明：该方法对等效声级Leq和统计声级L10,L50和L90等的预测具有较高的准确性,对交通噪声实地监测的优化布点和区域噪声分析有较强的指导意义。     

基于Modbus总线的智能烘房温度监控系统的设计

为能实时方便地监控烘房的温度变化情况,设计了一套基于Modbus总线和组态王的温度监控系统。该系统可将每个烘房的温度值通过Modbus总线实时传送到上位机进行显示、存储、打印等,上位机采用组态王设计监控画面。监控系统运算处理后给出控制信号,通过Modbus总线传送给输出量控制模块,由该模块控制烘房电加热箱和风机工作情况。该监控系统提高了烘房温度监控的准确性、便捷性和工艺流程的自动化水平。     

多媒体素材收集方法

在网络互联的时代,信息爆炸,信息的传递时刻都在发生.信息由多种素材构成,而信息的收集是信息处理和信息传递的前期工作.能够掌握有效的方法进行素材的收集是至关重要的.从文字、图片、声音、视频、动画等信息收集方法入手,充分论述了信息收集的手段和方法.     

计算机监控系统在张河湾水电站的应用

论述了张河湾水电站计算机监控系统的结构配置和功能特点。该系统实现了对张河湾水电站生产过程的实时监测、控制、保护、调节、数据采集,以及运行参数自动记录等功能,实现了电站＂无人值班＂或＂少人值守＂的运行管理模式。     

黑河下游河道渗漏面积的估算及其精度初步研究

黑河流域是我国西北干旱区内陆河的一个典型流域,其下游生态环境用水主要来源于地下水,地下水的补给主要通过河流的渗漏过程,因此河道渗漏补给是下游生态用水的主要来源。定量确定河道渗漏水量之前,首先需要确定河道渗漏面积。由于野外条件的限制,河道过水过程中黑河下游狼心山至东居延海区间河道的渗漏面积实地测量非常困难。根据水文流量资料选取2001年、2002年、2004年、2009年四年中全断面过水ETM遥感影像数据,在此基础上,运用遥感与GIS技术研究了对应时间黑河下游河道渗漏面积。选取具有不同特征的五段河道,运用AutoCAD软件对遥感提取结果进行误差分析,得到平均相对误差为4.29%,证明直接利用监督分类方法提取得到的结果具有较高的精度。在此基础上,建立渗漏面积与河长之间的关系。为该区域的水文过程及河道周围生态环境等的研究提供了数据和研究基础。     

Semi-automated feature-tracking of East Antarctic sea ice from Envisat ASAR imagery

While feature tracking of sea ice using cross-correlation methods on pairs of satellite Synthetic Aperture Radar (SAR) images has been extensively carried out in the Arctic, this is not the case in the Antarctic. This is due to the dynamic nature of Antarctic pack ice, its microwave signature, the tendency for SAR swath paths to be poorly aligned with the often narrow sea ice zone around the continent and inadequate satellite sampling. A semi-automated system, known as IPADS (IMCORR [IMageCORRelation] Processing, Analysis and Display System), has been developed to map fast ice and pack ice in Antarctica using multiple pairs of SAR images. The software processing pipeline uses overlapping image pairs which are geocoded and roughly registered using only data contained in the image headers. Next, fast ice maps are rapidly generated using zero motion features located within ocean regions. This also provides precise image registration. Finally, the same image pairs are re-examined for pack ice motion in a slower off-line batch process. The pack and fast ice are identified using a cluster-based search method which compares both location and motion information. Each image pair generates a NetCDF file which adds to a growing database of Antarctic sea ice motion and ice roughness. Five image-pair examples are presented to illustrate the methods used as well as their strengths and limitations. Substantial pack ice motion can often be detected in the marginal ice zone on SAR images only a few days apart.     

Automatic camera control in virtual environments augmented using multiple sparse videos

Automated virtual camera control has been widely used in animation and interactive virtual environments. We have developed a multiple sparse camera based free view video system prototype that allows users to control the position and orientation of a virtual camera, enabling the observation of a real scene in three dimensions (3D) from any desired viewpoint. Automatic camera control can be activated to follow selected objects by the user. Our method combines a simple geometric model of the scene composed of planes (virtual environment), augmented with visual information from the cameras and pre-computed tracking information of moving targets to generate novel perspective corrected 3D views of the virtual camera and moving objects. To achieve real-time rendering performance, view-dependent textured mapped billboards are used to render the moving objects at their correct locations and foreground masks are used to remove the moving objects from the projected video streams. The current prototype runs on a PC with a common graphics card and can generate virtual 2D views from three cameras of resolution 768×576 with several moving objects at about 11 fps.     

一种基于FS401的高分辨率视频转换器设计

介绍了VGA高分辨率视频分配设计原理和TV视频转换的系统原理与总体架构.基于FS401视频处理器和VGA视频分配技术的应用,设计开发了一种高分辨率VGA-TV视频转换器.在分析视频格式转换基本原理及FS401芯片功能结构基础上,对视频转换器的硬、软件进行设计,最终开发出视频转换器电路板并应用于实际系统中.实测结果表明,...