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    • Optics and Precision Engineering Journal

    Papers
    2M维矢量余弦整数变换核矩阵
    SANG Ai-jun, WANG Ting,LUAN Xiao-li,CUI Hai-ting,CHEN He-xin
    Guangxue jingmi gongcheng（2013）
    为了减少处理多维数据的运算时间,提出了2M维矢量离散余弦变换(DCT)整数核矩阵,并分析了该整数变换核矩阵的正交性和能量集中性.首先,根据原有浮点型2M维矢量DCT变换核矩阵的理论及性质介绍了2M维矢量DCT整数变换核矩阵的实现算法;验证了2M维矢量整数变换核矩阵的正交性.然后,简述了对*.yuv格式视频文件进行分块与重组的基本原理.最后,以四阶整数变换核为例,分析了2M维矢量整数变换核矩阵,即讨论多维数据在整数变换后的能量集中性.实验结果表明:采用2M维矢量整数变换相对浮点型变换仍然具有较好的能量集中性,而且Y分量能量集中性均值已达到97.3％以上,U...
    Cited6Views0
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    应用小波域三维Context模型的视频图像去噪
    卢刚,闫敬文
    OPTICS AND PRECISION ENGINEERING（2009）
    考虑视频图像序列的各帧之间具有较强的相关性,提出了一种基于三维小波变换和分块Context模型的视频去噪新方法(3DWTBCM).3DWTBCM法基于视频图像三维小波分解域内系数和噪声分布的特征,利用小波系数具有局部相关性对其进行分块,将系数分解成各个局部区域.然后,将Context模型用于局部块中,按照能量分布将块内的小波系数分成多个子块.对各部分进行能量估计和多阈值估计,获得去噪最佳阈值,并有效地消除噪声.实验结果表明,3DWTBCM的噪声抑制效果明显优于各种2D去噪方法和其他常用的3D去噪声方法,PSNR 平均提高0.5～1.2 dB.而且从视觉效...
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    Design and Analysis of Underground Pipeline Detecting System Based on PSD
    Jinwu Qian
    Optics and Precision Engineering（2008）
    With combination of a Position Sensitive Device(PSD) and other components,a kind of detecting system in interpostion was developed for detecting underground pipeline.The system detected the orientaion data at different measuring sites to obtain the orientations of underground pip...
    Cited5Views0
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    面阵CCD芯片KAI-1010M的高速驱动系统设计
    刘金国,余达,周怀得,李广泽,吕世良,孔德柱
    OPTICS AND PRECISION ENGINEERING（2008）
    介绍了行间转移面阵CCD芯片KAI-1010M的内部结构和驱动时序,采用新方法和低成本器件设计了该CCD芯片的驱动电路,把电源和电机控制的脉冲宽度调制技术引入CCD驱动电路,采用超高速运放驱动高速负压信号以减小其上升沿和下降沿时间,达到高速低成本驱动要求,解决了驱动设计中的技术难点.实验结果表明,此CCD驱动系统采用低成本的器件,性能好、成本低、能够同时输出两路CCD电压信号,数据输出速率达15frtame/s,满足空间测绘相机的系统设计要求.若进一步改进电路,数据输出速率可达27frame/s.
    Cited24Views0
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    星载嵌入式软件测试过程模型的研究
    Jia-yu CHEN,Zhong-bao XING,Jin-guo LIU,De-zhu KONG,Dong XU
    Guangxue Jingmi Gongcheng/Optics and Precision Engineering（2008）
    针对星载嵌入式软件的特点,在w型和X模型的基础上,给出了一种适用于星载嵌入式软件测试过程的模型-蝴蝶模型.该模型不仅完整体现了对整个开发活动的测试,而且支持迭代及变更,尤其适用于星载嵌入式软件的研制需要经历多个周期的特点,在尽早发现卫星型号产品软、硬件设计缺陷,缩短星载嵌入式软件研制的周期,降低软、硬件的成本,提高星载嵌入式软件的可靠性等方面都有着明显的优点,适用于星载嵌入式软件研制的整个过程.
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    基于DM642EVM的PCI总线实时数据通信技术
    MA Shu-lin,ZHONG Xian-xin,YAO Fu-guang
    Optics and Precision Engineering（2005）
    在众多的实时系统中,都对主机和DSP之间的数据通信速度有着很高的要求,PCI总线可以132 MByte/s的速度进行数据传输,成为解决高速数据通信的首选。本文讨论了基于TMS320DM642EVM的PCI数据通信的原理、数据通信的基本实现方法,并使用EDMA通道来实现DSP端片内和片外存储器之间的数据传输。
    Cited10Views0
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    Transparent Conductive Film (ITO) Deposited by IAD
    Chu Guo
    Optics and Precision Engineering（2001）
    WT5BZ]In addition to describing the conduction and growing mechanism of ITO films, the paper also discusses the influence of the ratio of indium to tin, the oxygen partial pressure, the substrate temperature and the evaporation rate on electrical and optical properties of the ITO...
    Cited23Views0
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    Internal model control for electro-optical tracking servo system based on sampled-data control theory
    Zhu Hua-zheng
    Optics and Precision Engineering（2008）
    A kind of Two-Degree-of-Freedom(TDF) Internal Model Controller(IMC) for electro-optical tracking servo system is presented.By converting the design of the controller to a H∞ optimization problem,the system can obtain good robust performance.With considering the dynamic behavior b...
    Cited14Views0
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    功能梯度压电驱动器的结构设计、制备与功能验证
    Jin-hao QIU,Hao JIANG,Hong-li JI,Kong-jun ZHU,Yong-jun LI
    Guangxue Jingmi Gongcheng/Optics and Precision Engineering（2009）
    根据作者早期研究中提出的一种新型功能梯度驱动器,设计并制备了该驱动器,建立了理论模型,并对驱动器的性能进行了测试.这种新型功能梯度驱动器由4种基于Pb(Ni1/3Nb2/3)O3-PbZrO3-PbTiO3系列的材料复合而成,且4层材料的压电常数和介电常数在厚度方向上的梯度变化相反,这种梯度结构能使驱动器结构内部的应力分布优于传统弯曲驱动器.为了对驱动器进行优化设计,利用经典复合材料力学和压电方程建立了功能梯度压电驱动器的理论模型,并计算了不同厚度配比的驱动器受电压和自由端集中力单独作用时的准静态变形和应力分布,通过分析驱动器的内部应力,确定了各层最优厚...
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    Measuring Star with Video Interpretation in Daytime
    Xiang Shen
    Optics and Precision Engineering（2000）
    A new method is provided to improve the ability in measuring star in daytime of TV measurement system in the measurement ship. By this method, video image of stars achieved by the TV measurement system on a optical measurement device can be recorded into a computer HD on real tim...
    Cited23Views0
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    生物反馈式括约肌的研制
    舒晶,颜德田,颜国正
    Optics and Precision Engineering（2004）
    针对肛门失禁患者的排便控制问题,研制了一种新的生物反馈式括约肌装置.根据正常人排便控制原理及内括约肌松弛反射过程,利用压力传感器对肠道压力进行测量,实现生物反馈;采用直流电机制成微型双向泵,对医用硅胶囊袋进行充(抽)液,模拟正常人内括约肌的收紧和松弛功能;整个装置由MSP430F1121单片机进行控制.动物实验结果表明,该装置能够较好地控制排便.
    Cited23Views0
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    CNC Grinding Model and Technology of an Equal Spiral Angle Cone Ball End Miller
    Lai Chuan
    Optics and Precision Engineering（2001）
    WT5BZ]The complexity of complex shaped tools′ structure makes the tool grinding process difficult. Taking the “equal spiral angel cone ball end miller” as an example, the continuity of space curves in the cone and the ball, and the tools′ structure and machining characteristics a...
    Cited23Views0
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    Calculation Method on Film Dynamic Coefficients of Multi Lobe Journal Bearings
    Jian Wang
    Optics and Precision Engineering（1998）
    Stiffness and damping coefficients are important characteristic.Coefficients that reflect the dynamic respond characteristics of journal bearings.The calculation method on these coefficients for liquid lubricated bearings is described in this paper,and calculation of actual examp...
    Cited23Views0
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    Analysis of Tool Breakage in CNC Manufacturing Using Wavelet Transform
    Shuchang Xu
    Optics and Precision Engineering（2000）
    WT5BZ]The paper introduces the features of the wavelet transform in contrast to the FT and FFT. Combining with tool breakage signal, the fast wavelet transform-Mallat algorithm is analyzed. It analyzes the technique of extracting the spindle motor current of the Machining Center,...
    Cited23Views0
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    Memory Mapping Technique of IBM PC/AT
    Qiu Bing
    Optics and Precision Engineering（2000）
    WT5BZ]The memory mapping principle based on IBM PC/AT ISA bus and its address decision are discussed in detail. Taking the interface of TMS320C32 and IBM PC/AT on stationary Fourier spectrometer real time data processing system for example, the memory mapping techniques of both 8...
    Cited23Views0
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    Mechanism Analysis and Simulation for Transfer Film Photograph Systems on Space Camera
    Wang Yan
    By means of CAD/CAE Application UG/Mechanisms, transfer film and image motion speed compensation systems on space camera have been kinematically analyzed and simulated, which provided interference check, rang of motion, displacement, velocity and acceleration for mechanical syste...
    Cited22Views0
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    数控非接触式超光滑光学元件加工机床的设计
    LI Xian-ling
    Optics and Precision Engineering（2012）
    基于数控技术,提出了一种非接触式光学元件表面超光滑液体抛光方法。通过磨头中心孔为抛光表面提供抛光液,抛光液在磨头自转的带动下与光学元件表面相互作用,实现光学元件表面材料的微量去除,利用计算机控制抛光磨头的运动轨迹完成对光学元件表面的抛光。根据上述原理,设计和研制了数控非接触表面超光滑光学元件加工机床样机,样机直线运动轴最低进给速度为0.000 1m/s,定位精度为0.008mm;摆动轴最低转速为0.002 8r/min,定位精度为15″。抛光实验结果表明,经过20min的超光滑加工,熔石英材质光学元件上两点的表面粗糙度Ra值分别由加工前的1.03nm和0...
    Cited3Views0
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    用于薄镜面主动光学的音圈力促动器设计
    ZHANG Yu-fang, LI Guo-ping
    Optics and Precision Engineering（2013）
    根据薄镜面主动光学存在的实际问题,提出了通过音圈电机对主镜镜面变形进行非接触面型校正的方法.讨论了音圈电机工作原理,基于音圈电机设计了一种非接触、高线性、体积小且控制方便的力促动器,并对其进行了仿真分析和实验验证.对常见类型力促动器结构进行对比.根据应用特点和音圈电机原理设计了该力促动器的总体结构,建立了物理模型与数学模型,根据应用要求提出了参数指标.最后,进行了实验验证.实验结果表明,该音圈力促动器是一个非接触式高线性系统,输出力可达±0.5N,在此范围内,线性度小于0.09％.
    Cited2Views0
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