基于生物特征识别的Android身份认证终端技术研究

为了提高特定应用场景下基于Android设备的用户身份认证的安全性,设计并实现了一个基于身份证信息读取、人脸和声纹识别的Android身份认证终端。该终端首先通过身份证刷卡设备和SDK获取用户的身份证信息,其次通过Android终端录制一段视频,在录制视频时,要求用户读出一段指定的随机文本,在此过程中会对视频中的人脸图像进行采集、预处理以及特征提取,同时会对声纹特征进行提取,然后采用指定的模式匹配算法对人脸和声纹进行匹配。实践表明该方法能够克服单一生物特征识别方式易于伪造的缺陷,具有更高的安全性。     

基于OpenCV的社保卡号码识别算法的研究

为了快速识别社保卡号码,在识别过程中运用到图像的预处理、图像分割,图像二值化,采用简单平滑处理、中值滤波、高斯滤波和双边滤波四种方法对图像进行去噪,提出了一种基于字符结构特征进行字符的识别算法,实现了对社保卡号码快速准确的识别。整个系统用Vsiual C++6.0和OpenCV开发。     

基于OpenCV的社保卡号码识别算法的研究

为了快速识别社保卡号码,在识别过程中运用到图像的预处理、图像分割,图像二值化,采用简单平滑处理、中值滤波、高斯滤波和双边滤波四种方法对图像进行去噪,提出了一种基于字符结构特征进行字符的识别算法,实现了对社保卡号码快速准确的识别.整个系统用Vsiual C＋＋6.0和OpenCV开发.     

基于STM32的号码识别与短信发送仪

针对目前手工输入电话号码工作效率低下、速度慢等缺点,研制一种基于STM32的电话号码识别与短信发送仪。采用STM32作为系统核心处理器,OV7670作为图像采集模块,设计了系统硬件电路,根据模块化思想设计系统软件。该装置号码识别的准确率高,能基本替代人工输入号码。     

基于权重最小二乘结构边缘保持色调映射算法

高动态范围图像由于其动态范围超过普通显示器的动态范围,所以无法正常显示,从而需要研究在保留高动态范围图像对比度、细节信息以及色彩信息的情况下压缩高动态范围图像的动态范围以适应低动态范围显示器进行显示的色调映射算法。本文提出基于权重最小二乘结构的边缘保持图像平滑色调映射算法。首先,建立基于权重最小二乘的边缘保持图像平滑滤波算子;然后,将输入的高动态范围图像转换至NTSC空间分离亮度信息和颜色信息,利用该滤波算子对亮度信息进行多级分层,获得基本层以及多级细节层信息;最后,对基本层进行动态范围压缩,利用压缩后的基本层结合多级细节层信息并转换回RGB空间获得输出的低动态范围图像。文中通过实验采集的多曝光图像序列利用Debevec和Malik提出高动态范围图像融合算法获得拍摄场景的高动态范围图像,采用本文提出算法对高动态范围图像进行色调映射处理获得较为理想的保留图像有效信息的低动态范围图像,从而验证了文中提出算法的有效性。     

基于OCR的身份证识别系统

光学字符识别(OCR)技术是通过光学输入方式将印刷品文字转化为图像信息,再利用文字识别技术将图像信息转化为可以使用的计算机输入技术.运用OCR技术进行证件识别输入具有效率高、出错率低、应用范围广等特点.本文采用基于OCR技术的识别系统,对身份证图像一系列预处理之后,采用统计模式识别的方法,完成证件识别.     

一种复杂图像背景中残留液晶识别方法

LCD液晶屏是对表面洁净度有严格要求的部件,基于数字图像处理的残留液晶识别方法能够定量、客观地评价表面的洁净度。针对复杂背景图像中残留液晶难以准确识别的问题,本文提出并实现了有效的图像处理流程和算法,包括分割、边缘连接、图像填充、去除多余边界以及噪声等操作。提出了一种边缘连接算子,在对图像进行分割后,将不连续的图像边界连接为闭合,为图像填充奠定基础。提出并实现了一个基于二叉分类方法的模式分类器,用于对污染物几何形状进行自动识别。实验表明,针对单一背景残留液晶的识别与分析方法能够精确获得残留液晶边缘,并且控制了噪声的干扰;针对复杂背景残留液晶识别与分析方法能够对背景存在明显差异的特定类型图像进行准确的处理。     

基于深度学习的笔迹性别识别

笔迹性别识别在取证分析中具有重要意义.近年来,虽然笔迹性别识别获得了越来越多的关注,但是目前提出的算法都基于人工设计的特征,难以准确地表达笔迹包含的信息,因而准确率较低.针对这个问题,本文提出了一种基于深度学习的笔迹性别识别方法,使用深度学习caffe工具,将预处理后的笔迹图像输入本文设计的卷积神经网络进行分类.本文首先提取笔迹图像的每个单词,然后取单词的不同全排列拼接成基础图,接着按照固定的大小从基础图截取材料图,最后以材料图为输入数据,以包含7个卷积层的网络为模型进行分类.本文的方法在IAM On-Line公开数据库上进行了测试,取得了较高的识别率.     

证据理论和模糊神经网络相结合的决策方法

针对图像识别中图像的特征信息,排除不确定因素的影响,提出了基于模糊神经网络和D-S证据理论的数据融合算法,并对图像识别为例进行了实例分析,验证了该方法的准确性.该方法先对输入图像进行数据分析,采用T-S模糊神经网络进行处理,再用D-S证据理论执行决策分析,最终得到识别精度较高的有效结果.     

Android平台实时人脸检测和性别识别的研究与实现

提出一种基于开源计算机视觉库OpenCV(Open Source Computer Vision Library)实现Android平台中实时人脸检测和性别识别的方法,阐述了在运行Android系统的嵌入式平台中采用AdaBoost算法实现人脸检测以及FisherFace算法实现性别识别的原因和具体实现方法,并分别在基于ARM和X86构架的两个嵌入式平台中进行了大量实验和测试数据对比。实验结果表明Android平台中能够实时地进行人脸检测和性别识别,且获得96.35%的人脸检测准确率和82.64%的性别识别准确率。     

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.     

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.     

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.     

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