基于运动的摄像机定标方法的综述

该文从运动方式角度将摄像机定标方式分为非限定运动方式和限定运动方式两大类,分别对摄像机各种运动方式对定标技术的影响进行了系统的研究,在应用中应该根据具体情况选择合适的摄像机的运动方式,以满足实际问题的需要。     

噪声方差和纹理复杂度分析的源相机识别

针对源相机识别问题,提出了一种利用噪声方差和纹理复杂度分析的源相机识别新方法。首先围绕CFA插值和小波去噪,讨论了传统的模式噪声提取方法的不足,接着重点讨论利用噪声方差以及根据模糊聚类去除高纹理复杂区域进行模式噪声提取的新方法。实验表明所提取的模式噪声不仅能更好地反映数码相机的模式噪声特性,而且对来自三种不同相机的照片的平均识别率提高了近6.3%。     

CMOS图像传感器用于网络摄像机的设计

以网络摄像机为应用背景,介绍了OmniVision公司两款CMOS图像传感器芯片的参数、接口和通信协议,结合网络摄像机的开发环境,给出了芯片与嵌入式CPU的硬件连接、PCB布局和调试经验,以及选择两款芯片的注意事项,并示例详细说明了用软件设置芯片有关寄存器的方法。分析了用CMOS图像传感器替代CCD图像传感器做网络摄像机视频前端的优势和可行性。     

数码单反相机的成像原理

本文阐述了传统单反照相机、数码单反照相机和单镜头电子取景数码照相机的结构、特性、工作原理和发展历程，对比了其各自的功能和性价比，并指出了：由于单镜头电子取景数码照相机在拍摄时记录下的景物与取景器上观察的景物完全是相同的，不存在任何时间差，而且相机结构相对较为紧凑、轻便，性价比较高，因此有可能取代数码单反照相机成为今后高档数码照相机的发展方向。     

高速宽幅铝箔轧机的特点及优势

介绍了高速宽幅铝箔轧机的主要技术特点,通过与国内外同类设备相比较,列出了该设备的多种优势和发展应用前景。通过两年多来的推广应用,该类型轧机完全可以替代进口设备。     

Electric characteristic and cavitation bubble dynamics using underwater pulsed discharge

Underwater pulsed discharge is widely applied in medicine, machining, and material modification. The induced cavitation bubble and subsequent cavitation collapse are considered the major motivations behind these applications. This paper presents an underwater pulsed discharge system. The experimental setup is established to induce and investigate the cavitation bubble assisted with a high-speed camera. Three aspects, including the characteristic of the discharge with different applied voltages and conductivities, the evolution of the cavitation bubble profile, and the energy efficiency of cavitation bubble inducing, are investigated, respectively. Especially, the mechanism of pre-discharge time delay in the low field intensity case is explained using the Joule heat effect. The results show the validity of the underwater pulsed discharger and experimental setup. The present underwater pulsed discharger is proved to be a simple, portable, and easy-to-implement device for the investigation of cavitation bubble dynamics.     

基于USB-HID接口的高速数据采集系统设计

介绍了基于USB-HID(Human Interface Device)接口的高速数据采集系统的开发过程,详细阐述了系统硬件设计、软件设计及其应用。通过EZ-USB FX2芯片CY7C68013和DSP处理器TMS320F2812实现与外部设备之间的数据传输和采集。该系统具有传输速度快、结构简单、实时性和可靠性高等优点,可自动被识别为HID设备。该系统可应用于高速数据和红外图像的传输和采集,传输平均速度可达40 MB/s,响应速度可达10 ms,能较好地满足数据实时传输要求。     

热喷涂技术替代电镀硬铬的研究进展

综述了近年来热喷涂技术替代电镀硬铬的研究进展。对比了高速火焰喷涂与电镀硬铬的工艺、性能和成本，提出了采用热喷涂技术替代电镀硬铬的应用领域，展望了其应用前景。     

4π探测器获取系统多路模拟求和电路的研究

介绍了一种高速多路模拟求和电路，它接收≥20mV的小幅度信号，在其SUMBUS（求和总线）产生每路50mV的输出信号，求和电路的输出信号可用于多重性鉴别和产生4π多重探测器数据获取系统的tigger信号。     

Improved selective growth of InP around dry-etched mesas by metalorganic chemical vapor deposition at low growth temperature

A comparative study has been carried out regarding selective embedding growth of InP by metalorganic chemical vapor deposition (MOCVD) around dry-etched mesas, using two types of reactors: a conventional horizontal type and a highspeed rotating-susceptor type. In the case of the conventional horizontal-type MOCVD, overgrowth on the mask was observed when the growth temperature was low (600°C). On the other hand, an almost planar grown surface without such overgrowth was achieved by using the high-speed rotating-susceptor MOCVD for a wide range of growth temperatures, especially even at a low growth temperature of 580°C. Regarding the high-speed rotating-susceptor MOCVD, we have also investigated the effects of dopants on the growth behaviors and have found a remarkable difference between n-type S-doped and p-type Zn-doped InP in the growth behaviors. The mechanism for suppressing overgrowth in case of the high-speed rotating-susceptor MOCVD, as well as the cause for the different effects between the dopants, are discussed.