基于计算机视觉的图像检测方案设计

本文本提出一种基于DSP的线阵CCD测量方案,通过线阵CCD以及DSP和CPLD组成的双核系统对物体进行轮廓的采集、测量和数据的处理传输,并且完成和PC机的通信,以达到对数据的再次深入的处理和分析。     

基于线阵CCD的二维轮廓扫描系统

吊装过程中为获取吊物具体位置信息,设计了一种基于线阵CCD的二维轮廓扫描系统。利用激光照射直线与线阵CCD投影直线相交的原理求取激光照射点二维坐标;提出了一种基于硬件的线阵CCD脉冲中心位置测量方法;采用双直线法对线阵CCD进行标定,得到其输出像素坐标与投影直线的映射关系;研究提出了一种升降速控制策略,能平稳高效地控制步进电机。用已知尺寸的圆柱形PVC管作为实验对象,系统测得其二维轮廓若干离散点坐标,通过圆周拟合的方式得到圆柱半径,平均误差为0.928 mm,系统一次扫描耗时约0.45 s;实验结果表明,系统测量精度较高,扫描速度较快,可广泛应用于物体的二维轮廓扫描。     

线性CCD实验系统的研究

CCD（Charge Coupled DeviCe）越来越广泛被应用于工业、军事、民用等行业,采用CCD数据采集卡,和微机相结合,对被测图像信号进行快速采样、存储及数据处理。本实验系统研究主要从5个实验的研究,其中讲述了线阵CCD的特性测量的基本原理、线阵CCD的输出信号的二值化测量的原理及方法、线阵CCD的A/D数据采集、及成像系统的研究、线阵CCD对物体的尺寸的基本测量、对角度的测量等基础知识。最后通过总结性的研究线阵CCD的A/D数据采集程序的方法。     

用液晶光阀实现大尺寸物体光学三维轮廓测量

提出一种用液晶光阀把计算机模拟正弦分布且具有一定榴移量的多幅干涉条纹投影到三维物体上，通过CCD采集被物体调制的变形条纹，在同一位置用计算机窗口来控制相移，实现对物体的光学位相三维轮廓测量，同时针对测量系统误差进行分析和讨论。     

基于CCD的激光扫描测距技术研究

对基于CCD的激光扫描测距技术进行了研究,采用线激光进行物体截面轮廓测量,测量系统由线光源激光器、CCD摄像机、图像采集卡、计算机和相应的测量软件构成,该装置能获取被测物体部分截面的深度图像和距离(尺寸)信息.     

线阵CCD测量系统的镜头畸变校正新方法

提出了一种线阵CCD测量系统镜头畸变校正的新方法.用线阵CCD相机及经纬仪组合体,对空间周期黑白条纹图像照相,通过图像处理和matlab曲线拟合建立图像像素坐标与无镜头畸变的理想像素坐标的关系式,即畸变校正函数.利用畸变校正函数可校正线阵CCD镜头畸变.将该方法应用于线阵CCD散布正交交汇测量系统后(两相机间距为1 561 mm),测量误差由畸变校正前5 mm提高到畸变校正后的0.9 mm.实验结果表明,用该方法进行镜头畸变校正后,线阵CCD散布测量系统的精度得到了显著的提高.     

彩色线阵CCD用于物体尺寸精密测量的研究

现有精密尺寸测量系统采用单阵列的线阵CCD作为光电传感器,不能检测像元的排列方向与物体尺寸方向的夹角γ,而当夹角γ在测量中发生变化时将引起测量误差,本文采用彩色线阵CCD（TCD2901D）作为光电传感器进行精密尺寸测量,检测出夹角变化带来的尺寸测量误差,得到了误差的修正方法。     

DMD芯片在光栅投影三维轮廓测量技术中的应用

光栅投影成像法经常用于物体的非接触形状测量和形变测量。通过莫尔相移法,可以实时获得物体表面的等高轮廓线。但是在测量高速运动物体三维轮廓图像时误差较大,因为相移法需要拍摄几张经过相移后的变形光栅。在加入了DMD芯片后,可以在CCD的一帧图像时间内完成所有的相移后变形光栅的图像拍摄,有效地降低了高速运动物体三维轮廓成像的误差。     

基于FTP的三维轮廓测量方法及实验

为了快速、高精确度地得到物体的三维轮廓信息,在此利用傅里叶变换轮廓术,将被测物体置于光栅投影下,采集变形光栅图像,根据被测物体表面的高度与相位差之间的映射关系,通过在计算机中与参考光栅原像的比较分析,以获得被测物体的三维轮廓信息。实验中搭建了由LCD投影仪、CCD摄像机、图像采集卡和光学导轨等组成的光栅投影测量系统的硬件平台,提出了用1台计算机同时控制投影和采集处理光栅图像,根据映射关系在多次实验中不断修改优化测量参数,做到既不影响视场范围,又保证较高的测量精度,并给出了由计算机重建后较好的三维轮廓图像精度及其实验的测量误差分析。     

基于线阵CCD阵列的在线检测方法

利用矩形光栅离焦投影,产生正弦光场,通过三个严格排列的线阵 ＣＣＤ阵列对物体三维轮廓进行扫描采样测量,一次扫描就可以获得三幅相位图。利用三步相移技术即可解调高度信息,避免测量过程中的相移操作。本文重点讨论了该方法的原理和特点,并给出试验简图及实际测量结果。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.