基于视频序列的交通检测系统

基于人工电视监视的交通检测方法存在检测效率低、实时性差的缺点,提出了基于视频序列的交通参数和交通事件检测系统。将采集和预处理后的视频信号通过DSP处理,检测视频交通参数和交通事件,提取的交通参数和交通事件等分析结果通过TCP/IP网络传输协议传给视频分析识别终端,在视频分析识别终端上存储、显示交通参数与交通事件和视频信息,设置系统参数,同时可以进行查询、检索以及管理交通参数与交通事件。该系统实现了对车流量、车速、抛落物、行人和停车等交通参数与事件的实时性检测。     

基于多特征的视频内容安全过滤方法

应国家对视频网站加强有序管理的迫切要求,文中应用一种基于多模态特征的网络视频分类方法,实现对网络视频的安全监管。该方法对从网络视频中提取三大类的视频特征,分别针对音频特征、运动和颜色以及空间和时间特征,递进地对视频进行过滤。通过对视频中不良场景的定义,包括恐怖、暴力和色情语义,以检测网络视频内容中潜在的不良信息,实验证明该方法有效地提高了不良视频检测和分类的准确率。     

基于音/视频特征的足球视频体育事件交互式检索方法

本文提出了一种交互式足球体育视频事件检索方法.在该方法中,首先从音频和视频中提取四种类型的特征,计算出它们的均值和标准差,并把这八个数据编码成一个染色体,建立与视频文件的索引.然后,利用交互式遗传算法实现足球体育视频事件的检索.首先,系统从数据库中随机地选取N个视频文件供用户观看与选择;然后,系统根据用户所选视频提取相应的染色体,并对这些染色体进行重组操作得到目标染色体;其次,把目标染色体与数据库中的所有染色体进行比较,利用欧式距离计算出它们的相似度,从中选取N个最相似的染色体对应的视频为下一代视频;最后,不断迭代上面的过程,直到得到用户想要的视频.通过对包含有400个视频事件的数据库的实验,证明该方法能够有效地检索足球视频数据库中的视频文件,准确率达到89%.     

一种基于多尺度实例学习的视频事件检测算法

现有的大多数视频事件检测方法首先从视频帧或视频快照中提取特征,然后对特征进行量化和汇集,进而为整个视频生成一个向量表示.最后的汇集步骤虽然简单高效,但是可能丢失时间局部信息,而这些信息对于确定长视频中事件发生的位置具有重要作用,从而削弱了事件检测的准确性.为此,本文首先将每个视频表示为多个“实例”,并将其定义为不同时间间隔的视频段.然后,针对每个视频的正实例比例已知和未知两种情况,提出基于多尺度实例学习的检测算法,在将实例标签看成隐藏潜在变量的同时推断出实例标签以及实例尺度的事件检测模型.最后,利用大规模视频事件数据集进行了全面的仿真实验,结果证明了本文算法具有显著的性能提升.此外,算法还可以确定视频中导致正检测的时间段的位置,进而对检测结果做出解释.     

一种基于视频指纹的视频检索方法研究

通过分块的色彩直方图对视频进行分割,提取每个视频子片段的关键帧,并提出了一种以SIFT特征为基础的语义词袋方法实现视频指纹的提取,该方法既提高了视频指纹提取的速度,又能得到具有较高独立性和鲁棒性的视频指纹。利用串匹配的方法实现视频指纹的匹配检测,并进一步对相似度进行加权处理,提高了匹配效率与匹配精度。     

视频监控中运动图像序列三维重建

视频监控中运动图像序列三维重建一直是三维重建研究的重点,其重建效果会对运动图像的清晰度产生影响。但当前三维重建方法都是通过获取二维视频监控中的运动图像序列,通过基于Java Applet与Java Application编程,采用体绘制法完成视频监控中二维运动图像序列的三维重建,该方法无法保证重建后的图像质量,导致图像清晰度不高。为此,提出基于图像特征点提取与匹配的视频监控中运动图像序列三维重建方法。首先,对视频监控中运动图像序列特征点进行检测,并对特征点一定邻域内图像的纹理、结构以及其他特征进行统计,通过对运动图像序列特征点的特征比较,完成运动图像序列特征点提取与匹配;然后,对视频监控中运动图像序列的结构和运动初始化,并进行视频监控相机的自标定,实现对视频监控中运动图像序列的三维重建。实验结果表明,所提方法能够有效提高三维重建后视频监控中运动图像序列的清晰度,减少三维重建流程,提高运动图像序列重建效率,具有良好的使用价值。     

多特征融合和改进神经网络的运动视频镜头转换检测

针对当前单一特征无法描述体育视频镜头转换信息,以及传统神经网络收敛速度慢等缺陷,为了提高体育视频镜头转换检测正确率,设计了一种多特征融合和改进神经网络的体育视频镜头转换检测方法。首先,采集体育视频镜头转换数据并提取多特征向量,以更加完整反映体育视频镜头转换信息;然后,针对BP神经网络的连接权值确定缺陷,对神经网络进行改进,建立更优的体育视频镜头转换检测模型;最后,采用具体体育视频镜头转换检测仿真实验对文中设计方法进行验证性测试,该方法的体育视频镜头转换检测正确率超过95%,误检率远远低于其他体育视频镜头转换检测方法。     

一种新的多特征融合视频篡改检测方法

三网融合的视频防插播、防篡改技术已成为信息安全领域重点攻关的关键技术。针对多媒体业务被恶意篡改的问题,提出一种新的多特征融合的视频篡改检测方法：结合LM算法对BFGS进行融合改进,提出改进的BFGS神经网络,通过提取视频特征平均梯度和信息熵,采用改进的BFGS神经网络进行融合篡改检测。实验结果表明,该算法收敛速度快,学习精度高,能有效地对视频篡改进行检测。     

基于多特征融合的视频检索算法

随着视频等多媒体数据呈指数式迅猛增长,高效快速的视频检索算法引起越来越多的重视。传统的图像特征如颜色直方图以及尺度不变特征变换等对视频拷贝检测中检索速度以及检测精度等问题无法达到很好的效果,因此文中提出一种多特征融合的视频检索方法。该方法利用前后两帧的时空特征进行基于滑动窗口的时间对齐算法,以达到减少检索的范围和提高检索速度的目的。该算法对关键帧进行灰度序列特征、颜色相关图特征以及SIFT局部特征提取,然后融合全局特征和局部特征两者的优势,从而提高检测精度。实验结果表明,该方法可达到较好的视频检索精度。     

基于视频的交通事件自动检测方法的研究

研究了基于视频的交通事件自动检测技术,它通过车辆跟踪和分析车辆的运动特征来判断所发生的交通事件.针对三种常见的交通事件车辆逆行、车辆停止和堵车进行建模.实验证明,该检测方法具有很好的实用效果.     

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.     

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.     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

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.