Degradation of modulation transfer function in push-broom camera caused by mechanical vibration

It is important to analyze the degradation of the image quality caused by camera vibration in order to determine the tolerance of stabilization in satellite attitude. An improved model for calculating the modulation transfer function (MTF) of a push-broom CCD camera is proposed, and two kinds of experiment systems are constructed to measure the degradation of the MTF caused by vibration. The calculated MTF values with respect to low- and high-frequency vibration agree with the experiment results, indicating that the model is valid for studying the stabilization of satellite attitude.     

软件控制实现高速摄影机的收片启动特性

对棱镜补偿式高速摄影机的收片启动特性进行了定量分析 ,根据分析给出了在工程中实现这一运动特性的步骤和方法 ,该方法的核心思想是从试验中得到控制运行所需要的参数 ,然后用软件控制实现摄影机的收片启动特性。实际的工程使用证明该方法简便且行之有效 ,方便了摄影机调试     

基于嵌入式Linux的网络摄像机设计

提出了一种基于32位嵌入式操作系统的网络摄像机设计思路，并从硬件结构、软件框架方面介绍系统的具体实现方法．采用台湾智源公司的FIC8120作为系统主控芯片，省去了设计专门音视频压缩编码模块，显著减少了系统复杂性．该软件平台采用可移植、裁减和实时多任务特性的Linux操作系统，可用于处理复杂的网络传输协议，具有良好的稳定性和可靠性．     

脉冲X射线源的获取及门控成像

介绍了带门控的MCP像增强器及条纹相机对激光驱动产生的脉冲硬X射线进行探测的方法.该方法可以减少X射线的散射,使图像对比度有较大的改善,从而能够大大降低人体对X射线的吸收剂量,在X射线透视及X射线CT诊断中有重要应用.     

An Imaging Colorimeter for Noncontact Skin Color Measurement

There has been a considerable effort made in several medical fields in the objective color analysis and characterization of biological tissues. Conventional colorimeters have proved inadequate for this purpose, since they do not provide spatial color information and because the measuring procedure randomly affects the color of the tissue. In this paper an imaging colorimeter is presented where the non imaging optical photodetector of the instrument is replaced with a charge-coupled device (CCD) sensor of a color video camera, enabling the independent capture of color information for any spatial point within its field of view. Combining imaging and colorimetry, the acquired image is calibrated and corrected under several ambient light conditions, providing non contact reproducible color measurements free of the errors and limitations present in conventional colorimeters. The technique has been used in hospital clinics for a wide variety of patients. These features highlight the potential of the imaging colorimeters as clinical and research tools for the standardization of clinical diagnosis and the objective evaluation of treatment efficacy.     

二维正交光楔列阵大焦斑均匀照明光学测试系统的研究

为了检测列阵式靶面均匀照明光学系统聚焦特性，成功地开发了测定微米量级光强度起伏干涉斑纹投影放大的新技术。报道了测定聚焦不斑一维，二维大尺度不均匀性小尺度干涉斑纹的实验方法，结果及误差分析。     

北京正负电子对撞机束团拉伸效应研究

本文叙述了在北京正负电子对撞机(BEPC)上,用条纹相机和频谱分析方法对束团拉伸效应的研究.由测量结果归纳出BEPC束团拉伸效应的标度规律,这一规律与理论分析有相当好的一致关系.     

一种高速摄影机同步控制系统

介绍一种高速摄影机的控制系统,重点阐明了系统速度和相位的启动控制方法、 PID复合控制算法以及控制软件的设计,最后给出实际应用的结果,满足了系统对控制性能各个指标的要求.     

BIFURCATION OF PERIODIC ORBITS OF A THREE-DIMENSIONAL SYSTEM

§ 1 . IntroductionThere has been a general theory on bifurcation of periodic orbits for two or higher-dimensional systems, and the theory for two-dimensional systems is much richer than thatfor higher-dimensional systems (see [1–11]). We have a relative…     

单组分荧光寿命成象显微的研究

激发光的调制频率和CCD所记录到的光强度是影响荧光寿命成象显微频域法测量和数据处理精度的主要因素.本文采用Monte Carlo方法,以单组分问题为例,研究了在用频域外差法进行荧光寿命成象显微测量中激发光的调制频率以及CCD所记录到的光强度对数据处理精度的影响,给出了当调制频率不变时,在不同荧光强度下,对于不同的荧光寿命范围、荧光寿命计算的统计结果,给出了改进测量精度的方法.