基于印刷年份的人民币版本识别技术研究

根据人民币背面印刷年份作为人民版本识别的特征,进行人民币版本的识别。提取印刷年份过程包括对图像的采集、边缘检测、图像旋转、最小值滤波等预处理,以及采用投影法对印刷年份字符区域的定位。字符区域被提取出来以后,再使用八向模板匹配的方法,使待测样本与模板样本逐一比较,计算它们的相似度,与待测样本相似度的最大模板样本的版本作为待测样本的版本。采用100张99版和100张05版人民币图像作为样本进行实验,实验结果表明,该方法版本识别率达到97%以上。     

基于LabVIEW的人民币冠字号识别系统研究

系统的工作方式主要是对人民币采集图像,然后进行包括图像灰值化、滤波、倾斜校正及对冠字号目标区域提取的图像预处理,随后利用LabVIEW中Vision Assistant工具里的OCR功能对冠字号中出现的字符进行训练并建立模板数据库,与提取出的冠字号区域进行匹配从而识别出字符并转换成文本。系统用户操作界面简洁,具有较高的识别准确率及速度。     

基于RBF的纸币序列号识别方法

序列号识别是金融安全领域的一个重要步骤.针对纸币序列号的字符特点,提出了一种基于径向基函数神经网络模型(RBF)的光学字符识别方法.使用工业相机,采集得到纸币图像,并进行必要的预处理,得到序列号区域的二值图像.再根据连通区域信息对单个字符进行分割并归一化,然后提取字符的二维空间分布信息作为特征向量,并结合径向基函数神经网络进行字符识别.实验证明,该神经网络仅两层隐藏层,结构简单,在小样本集下可达到95%的识别率,并且训练时间在100ms量级,能够很好地满足纸币序列号识别功能的要求.     

基于边缘检测的车牌识别算法的实现

针对传统车牌识别的不足,本文提出了基于边缘检测的车牌识别的算法.该算法首先对摄像头获取的车牌图像预处理,去除图像无用信息,然后运用Robert算子检测车牌边缘,并对车牌区域进行图像较正,用高斯滤波法去除噪声并且提取车牌信息特征,接着对车牌区域水平和竖直方向运用触点定位法分割字符,对车牌分割后与相应字符模版匹配,利用预测模型预测识别结果,最后识别出车牌字符.     

基于STC12C2052的人民币识别控制系统的设计

设计研究人民币纸币识别控制系统中的主要模块,如图像采集、控制模块。在硬件部分,选用STC12C2052作为控制系统的芯片,选用MVC1000M作为图像的采集器件;在软件部分,在红外和紫外光源的作用下通过高清摄像头拾取图影信息,通过与数据库中的真版人民币特征的数据比对来判断真伪,选取预处理之后的纸币图像的尺寸特征用模糊逻辑推理方法识别图像的面值,提取矩作为特征。通过实验证明该控制系统的有效性和可行性。     

基于DSP的人民币序列号识别系统的研究

介绍了一种基于DSP的人民币序列号识别系统,可自动识别并记录下通过该系统的人民币序列号,从而实现对人民币序列号的信息化管理。系统选用DSP与CPLD双核心架构,采用图像倾斜校正、二值化、中值滤波、字符定位、特征提取与特征识别等多种手段来采集与识别人民币的序列号;利用先进的二叉树、穿越特征、外围特征等算法判定已知字符的唯一性;同时可利用USB通信与PC配合,完成对识别后的人民币序列号的数据库管理。该系统可以实现不同版本、不同面额的人民币序列号识别,具有良好的实时性、可靠性和便携性等优点。     

Research of RMB Serial Number Identification System Based on DSP

介绍了一种基于DSP的人民币序列号识别系统,可自动识别并记录下通过该系统的人民币序列号,从而实现对人民币序列号的信息化管理.系统选用DSP与CPLD双核心架构,采用图像倾斜校正、二值化、中值滤波、字符定位、特征提取与特征识别等多种手段来采集与识别人民币的序列号;利用先进的二叉树、穿越特征、外围特征等算法判定已知字符的唯一性;同时可利用USB通信与PC配合,完成对识别后的人民币序列号的数据库管理.该系统可以实现不同版本、不同面额的人民币序列号识别,具有良好的实时性、可靠性和便携性等优点.     

基于字符特征的文本验证码破解

文中使用基于字符特征识别方法对基于文本图像的验证码进行破解研究。以某银行的验证码为例,介绍基于文本图像验证码的识别和破解过程。具体分为验证码预处理、字符提取和字符识别3个阶段。在识别阶段,分别使用颜色填充法、三线条法、全面扫描法的字符特征识别方法,在准确率和速度上都取得了理想的效果,对验证码的识别正确率达78%。文中所提字符特征识别和验证码破解方法,同样适用于其他非粘连的基于文本图像的验证码。     

基于改进模版匹配的车牌字符分割

车牌字符分割是车牌识别系统中的关键技术之一。为了有效地对车牌字符进行分割,提出了一种基于改进模版匹配的新方法,该方法包括车牌区域图像预处理、车牌字符校正、车牌字符去边框处理和改进模版匹配的车牌字符分割处理等四个步骤。与传统的车牌字符分割方法相比,该方法不仅能够在正常条件下对车牌字符有效地进行字符分割,而且还可以有效地解决车牌字符粘贴、车牌字符残缺和车牌字符区域质量差等情况的车牌字符分割问题。实验结果表明,该方法具有算法简单、实时性强和分割效果好等优点。     

一种基于CIS的快速字符识别算法

字符识别目前广泛用于文献资料的检索等场合。目前大多数字符识别使用摄像头采集图像,预处理后,进行字符校正,字符分割,字符识别。传统算法主要存在运行速度慢,耗时长,内存占用多等问题。同时,用摄像头采集图像,其本身也有一定的缺陷,例如对光线敏感等。因此,文中提出使用一种改进过的FPA字符细化算法结合SWT文本检测算法对文本进行预处理,使用HOG特征向量提取以及SVM分类等算法进行字符识别。同时,给出一种新型的基于CIS(接触式图像传感器)图像采集和处理系统,CIS自带光源,具有一些摄像头所不及的优点。文中方案经过测试,识别率较高,运行速率较快,内存占用率和处理时间较传统的字符识别方式都有一定的改善和提高。     

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.