基于空间虚拟墙的行人越界异常行为自动识别

提出了基于空间虚拟墙的行人越界异常行为自动识 别方法。基于人头刚体不变性及其个体类Haar特征的差异性,融合级联分类器与粒子滤波动 态跟 踪链,实现视频场景下的人头 目标跟踪与定位。进而基于人体身高不变性,建立基于行人头顶的三维平面方程及 其视频监控场景下的空间虚拟墙, 从而将行人跨越二维场景警戒线问题,转化为行人穿越三维空间虚拟警戒墙,实现行人是否 越界的有效判断。通过在不同视 频场景的实验验证与对比,结果表明,所提方法有效、可行,无需特定的硬件支持以及场景 条件约束。     

基于蒙特卡洛树搜索的视频异常场景监测方法

通过视频监控可以更快速地发现异常场景,并尽快制止违法暴力行动。为保证监测精度,文中设计一种基于蒙特卡洛树搜索的视频异常场景监测方法。首先对行人轨迹特征进行提取,计算目标预测位置与实际位置的空间距离,判定二者的相对位置,建立三级异常图像;再基于蒙特卡洛树搜索算法设计行人行为判别方法,构建不确定判别网络,标记残差函数,对数据进行归一化处理,同时获得激活函数以及函数的输出值;最后,设计视频异常场景监测算法,基于协方差矩阵将多个判别结果汇总成一个整体,并以此得到监控视频内异常场景的监测结果。该方法能够通过目标提取得到视频内的异常目标。目标识别精度的测试结果表明,所提方法在简单场景与复杂场景内的AUC值分别为0.952和0.886,说明其监测精度较高,在简单场景与复杂场景下均可正常使用。     

交通监控系统中车辆和行人的检测与识别分析

在识别以及检测行人以及车辆的过程中主要是将帧间差分结合起来,建立动态交通场景视频图像监控的序列背景模型,之后再借助背景消除法有效检测监控视频中目标的运动状况,将运动目标的轮廓提供出来,最后利用支持向量机,快速识别检测出来的运动目标。研究结果显示,这样的识别和检测的方法更加有助于精确地检测和分类识别,在监控视频中运动的行人以及车辆,自动报警有出现非法入侵的行人。本文探析了在实际的监控交通系统中识别以及检测行人以及车辆的主要状况分析,帧间差分动态更新背景模型的运动目标检测算法,以及基于支持向量机基础之上自动识别行人以及车辆。     

基于DM8148的警戒区域告警算法的实现

智能视频监控作为安全防范的一种有效手段,有广阔的应用前景。针对这一需求,提出了一种基于DM8148平台的警戒区域告警算法。该算法采用混合高斯模型,结合背景减法检测移动目标,线性预测结合Blob匹配跟踪运动轨迹,分析目标行为判断是否存在警戒区域入侵现象。通过实验验证,该算法所具备的低误报率和高报警精度能满足智能监控对高效率、高实时性要求。     

基于时空轨迹融合的遮挡视频行人重识别

针对视频行人重识别中的目标行人大范围遮挡的问题，将具有时间关联性、不受遮挡影响的行人轨迹预测与行人重识别相结合，提出一种基于时空轨迹融合的遮挡视频行人重识别算法。首先，从时间与空间域出发，实现符合社会属性的精确行人轨迹坐标预测；其次，构建时空轨迹融合特征，将视频序列中的表观视觉特征与行人轨迹中的坐标数据有效结合，有效缓解查询集中遮挡问题对重识别性能造成的影响；最后，构建适用于所提算法的轨迹融合数据集MARS＿traj，并通过实验证明所提算法对遮挡视频重识别性能的有效提升。     

光传感器监控系统中行人识别模型的研究

针对传统的行人识别模型行人识别速度慢的问题,设计了一种光传感器监控系统中行人识别模型。引入抛物线拟合,将三维场景中的点阵聚合成现实场景中的物体,对监控区域三维重建,在此基础上,采用野点去除和噪声去除的方法去除外界因素对行人目标造成的高频干扰,采集行人区域数据。采用红外图像分割方法,分别对行人目标与背景建模,最后将行人目标模型与背景模型结合生成行人识别模型。实验对比结果表明,此次设计的光传感器监控系统中行人识别模型比传统的图像阈值分割模型、激光雷达行人识别模型、模板匹配行人识别这三种传统模型行人识别速度快,能够满足行人识别需求。     

人体及穿戴特征识别在电力设施监控中的应用

针对电力设施智能监控系统中目标人员及其穿戴特征,本文提出了一种高鲁棒性的检测方法.首先采集行人的目标正样本,以及所要监控的场景中无行人目标的负样本,接着基于HOG(Histogram of Oriented Gradients)特征以及线性SVM(Support Vector Machine)训练行人检测的分类器,检测进入场景中的行人目标;对检测到的行人的头部、腰部区域,采用HSV色彩模型判断人员是否进行安全着装,及时预警,避免危险发生.本文将目标识别及穿戴特征分析技术应用于电力设施作业现场监控中,可以更准确的识别入侵的人员,也可以在应急事故抢修时,加强工作人员规范操作,提前预警,避免危险.     

三维立体成像技术在安防监控中的应用

随着科学技术的不断发展,三维立体成像技术在现代科学技术的众多领域得到了非常广泛的应用。而视频监控领域由于二维成像技术的局限性,也急需引入三维立体成像技术。文章对于三维立体成像技术的原理进行了简单的概述,并且基于在安防监控中可以应用的场景,对三维立体成像技术的应用方向进行分析,为将来立体化的视频监控设备的成型提供了思路。     

一种新型无线智能视频监控系统的设计

通过对视频监控行业的主流技术进行研究,针对现今视频监控领域的复杂需求,提出了一种基于WDS(Wireless Distribution System)网络的无线智能视频监控解决方案。其中,视频监控客户端通过MJPG-Streamer完成视频信号的采集和处理,WDS网络为视频数据流传送提供高带宽的通信支持,后端基于背景差分算法的程序完成对监控区域的入侵识别。测试结果表明,系统整体运行稳定,入侵识别效率较高,具有一定的应用价值。     

换流站三维实景空间定位与区域入侵监测

换流站目前主要通过人工巡视的方式监测区域入侵,监测效率较低,且容易出现纰漏,无法确保换流站关键区域的安全性,针对以上问题,提出换流站三维实景空间定位与区域入侵监测方法。构建换流站三维实景模型,定位三维警戒空间,利用目标跟踪算法,监测换流站入侵目标。实验结果表明,该方法针对5次入侵事件,监测的平均偏差始终低于1.675 m,定位警戒空间的偏差较小;最高漏检率和最高误检率均未超过1%,整体监测平均时间为0.53 s,保证了换流站关键区域的安全性。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks