Robust moving object detection against fast illumination change

To solve the problem due to fast illumination change in a visual surveillance system, we propose a novel moving object detection algorithm for which we develop an illumination change model, a chromaticity difference model, and a brightness ratio model. When fast illumination change occurs, background pixels as well as moving object pixels are detected as foreground pixels. To separate detected foreground pixels into moving object pixels and false foreground pixels, we develop a chromaticity difference model and a brightness ratio model that estimates the intensity difference and intensity ratio of false foreground pixels, respectively. These models are based on the proposed illumination change model. Based on experimental results, the proposed method shows excellent performance under various illumination change conditions while operating in real-time.     

Resolution enhanced light field near eye display using e‐shifting method with birefringent plate

Light field near eye displays (LFNED) can produce lightweight devices and address the accommodation–convergence conflict. However, low spatial resolution creates a poor immersive experience in LFNED. In addition, although many e‐shifting devices have been proposed to enhance resolution in projection system, yet those devices are too bulky to be applied in an LFNED to keep it lightweight. In this paper, a compact e‐shifting component is proposed to enhance image resolution in an LFNED by using a birefringent plate and twisted nematic switch cell. The proposed e‐shifting device is a flat and thin component with only 2.6 mm of thickness, which could be placed in the gap of an LFNED without increasing the thickness. The results show that the proposed components could be easily integrated in an LFNED with the result of resolution enhancement.     

物料编码子系统在物资管理系统中的设计与实现

基于物资管理系统中对物料编码进行统一管理的需求,前台在DELPHI 2007中引入OCI11组件,后台采用Oracle 11G数据库,设计了一套物料编码管理子系统。该系统设计灵活、扩展方便、级长及每级长度都可自定义,每一级的每一个节点都可以作为叶子节点,节点上的属性包括名称、型号、计量单位、存储仓库、货架号和质量等级等,物资管理系统中对物料的引用都是物料编码,实现了物资管理系统中对物料的高效查询、分组统计便捷、仓库移库方便和货架号移位方便等管理要求。     

汉英短语翻译对的自动抽取

介绍从平行语料库中如何抽取双语短语翻译对。首先用统计模型正则期望从汉语专利语料库中抽取汉语短语。抽取的短语利用统计知识和语言学知识来过滤,使得过滤后汉语短语的正确率较高;其次,利用词对齐工具Giza++从汉英平行语料库中抽取词汇对齐,在词汇对齐的基础上利用开源工具Moses抽取汉英短语对齐,根据短语对齐与抽取出的高质量汉语短语的交集来抽取候选的汉英互译的源语言短语;接着使用停用词、对数似然估计法LLR和上下文熵来对英语短语翻译进行过滤。实验结果表明,过滤后,抽取的汉语短语准确率为97.6%,汉英短语翻译对的准确率为92.4%。     

基于目标检测及跟踪的视频摘要技术研究

为了能够在不丢失有用信息的前提下对海量监控视频进行摘要,提出一种基于目标检测及跟踪的视频摘要技术。首先根据混合高斯模型对视频进行背景建模,获得监控视频的背景;然后通过背景减法对运动目标进行检测,得到前景运动目标;其次对检测到的运动目标采用分层关联的思想进行目标跟踪,得到运动目标的完整信息;最后将这些运动目标及视频背景重新组装成摘要视频。实验结果表明,该方法能够有效地对监控视频进行浓缩,形成的摘要视频能够完整地保存原有视频信息,减少了存储空间,降低了成本,方便了相关人员及时获取有用信息,提高了工作效率。     

基于多位置寻北技术的伺服系统

在介绍多位置寻北技术原理的基础上,设计一个位置、速度双闭环伺服控制系统,以保证陀螺在转动过程中不受冲击。该系统采用分度定位的方法,在转台一周等间隔选取n个点,通过PID控制器对每点实时进行位置和速度的校正,使各点的转动时间不超过200 ms,定位精度1.1′,实现定向时间短、精度高的方位信息的测量,提高陀螺测量的稳定性,为获得高精度寻北结果提供了保障。     

即时消息传递系统的智能代理

针对不同Instant Message(IM)系统之间消息不能互通的问题提出了智能代理的构想,通过自定义一套XML通信协议实现该智能代理,并通过XML通信协议实现和其他即时消息传递系统的通信协议相互转换,使不同的IM系统之间信息可以互通。     

Applying case-based reasoning for product configuration in mass customization environments

Product variation and customization is a trend in current market-oriented manufacturing environment. Companies produce products in order to satisfy customer's needs. In the customization environment, the R&D sector in an enterprise should be able to offer differentiation in product selection after they take the order. Such product differentiation should meet the requirement of cost and manufacturing procedure. In the light of this, how to generate an accurate bill of material (BOM) that meets the customer's needs and gets ready for the production is an important issue in the intensely competitive market.

The purpose of this study is to reduce effectively the time and cost of design under the premise to manufacture an accurate new product. In this study, the Case-Based Reasoning (CBR) algorithm was used to construct the new BOM. Retrieving previous cases that resemble the current problem can save a lot of time in figuring out the problem and offer a correct direction for designers. When solving a new problem, CBR technique can quickly help generate a right BOM that fits the present situation.     

单输出组合网络的TLU FPGA的逻辑映射

基于真值表结构的ＦＰＧＡ，即ＴＬＵＦＰＧＡ是一种颇具代表性的ＦＰＧＡ结构。在本文中作者针对单输出组合网络，提出并实现了对面积和延迟进行折衷考虑的ＴＬＵＦＰＧＡ的逻辑映射算法，它综合了面积驱动的Ｃｈｏｒｒｌｅ－ｃｒｆ及延迟驱动的Ｃｈｏｒｔｌｅ－ｄ的的优点。     

基于MC13233的ZigBee物理层分析与设计

以Freesacle公司的ZigBee RF4CE芯片MC13233为基础,依据嵌入式硬件构件的规范设计了硬件各模块。介绍MC13233的ZigBee物理层的模型。详细阐述MC13233的ZigBee物理层的设计方法,具体实现RF收发器的工作模式设置、物理层数据收发、CCA/ED/LQI,并给出了物理层正确性和可靠性测试。