Pattern codification strategies in structured light systems

Coded structured light is considered one of the most reliable techniques for recovering the surface of objects. This technique is based on projecting a light pattern and viewing the illuminated scene from one or more points of view. Since the pattern is coded, correspondences between image points and points of the projected pattern can be easily found. The decoded points can be triangulated and 3D information is obtained. We present an overview of the existing techniques, as well as a new and definitive classification of patterns for structured light sensors. We have implemented a set of representative techniques in this field and present some comparative results. The advantages and constraints of the different patterns are also discussed.     

一种新型溴化铈闪烁体探测器性能研究

闪烁探测器在射线能量与时间的探测中发挥着重要作用。针对国产新型溴化铈（CeBr₃）闪烁晶体,本文建立实验系统和方法对其关键性能指标进行了测试,具体包括：建立了快符合时间分辨系统测量装置,测试得到新型闪烁探测器对于⁶⁰Co源的时间分辨率为142 ps;建立了单光子计数法测量装置,测试得到溴化铈晶体的衰减时间为16.8 ns,上升时间为0.18 ns;建立了相对光输出测量装置,测试得到其相对于同规格NaI(Tl)闪烁体探测器对于661.66 keV射线的光输出为161%;同时针对其能量响应性能进行了测试,测得对于661.66 keV射线其能量分辨率为4.7%。将国产新型溴化铈闪烁晶体的性能测试结果与国际上同类晶体以及氟化钡、溴化镧、碘化钠等常用无机闪烁体的性能进行了比较,对其应用前景进行了探讨。     

我国小型、线材生产基本情况及市场分析(一)

简介 我国小 型、线 材轧机的 生产能 力、设 备组成 、近年 实际产量 等基 本情 况． 就小 型材、线材的 国内市 场及消费 情况进行 了分析 ．     

X射线成像光斑检测装置研制

设计了一种低成本,快速响应的X射线光斑检测装置,可用于解决系统结构偏差所引起的透视探测器接收位置处的光斑偏离。该装置通过检测关键点处的X光斑强度及分布情况以判断实际X光斑位置与理论设计的偏差,以此为依据进行多次调整可使系统光斑调节到一合理位置。     

超高压汞灯配光曲线的自动测量

为了准确获得超高压汞灯配光曲线数据，通过分析光源尺寸以及光源与探测器距离对测量结
果的影响，利用计算机接口技术和光电转换技术构建一套自动测量装置对超高压汞灯的配光曲线进行自动
测量。利用程序延时以及软件滤波消除超高压汞灯驱动电流、电压、测量装置机械振动对测量结果的影响
，从而提高了测量数据的准确性和稳定性。装置测量所得数据不仅可以满足投影系统仿真对配光曲线精度
的要求，而且可以为超高压汞灯的泡壁和电极设计提供参考。     

论绿色照明工程

人口资源和环境是当前人类生存的三大问题。本文结合工程设计阐述如何推广实施“绿色照明工程计划”,节约能源,保护环境。     

薄规格镀锌板的生产

南方镀锌线在开工初期 ,生产薄规格带钢中出现的断带、褶皱、外观差、喇叭口等问题 ,通过研究薄规格带钢运行特点 ,突破常规的镀锌工艺 ,制定出薄规格产品的最佳工艺制度和控制参数 ,总结出生产高质量薄规格镀锌板的成功经验 .     

交通灯控制系统中黄灯时间的确定

介绍了电灯的由来,探讨了黄灯时间的长短对交通安全正负两方面的影,在应用力学和运动学原理的基础上,提出了一种计算黄灯时间的模型.分析了模型建立的全部过程,最后列出了黄灯时间的求解公式.     

Incident Light Metering in Computer Graphics

Every rendering process consists of two steps. The first is the computing of luminance values by methods like ray tracing or radiosity, and the second step is the mapping of the computed values to values appropriate for displaying. In the last years, as alternative to simple linear scaling which maps the average value to the medium luminance, some new ways of mapping were introduced. These new methods are based on photography analogies and on human vision models. All existing methods follow, implicitly or explicitly, the reflected light metering principle. The method introduced in this paper is the first that follows the incident light metering used in professional photography and in the movie industry. Actually the irradiances are measured using a set of diffusors, which are placed automatically in the scene, and a linear scale factor based on these measurements is used to map the computed radiances to the display device. The diffusors act as half space integrators, they collect the light energy from all half space directions. The light comes from the primary light sources, or it is the result of various interreflections. The newly introduced method reproduces original colors faithfully even for scenes with very low or very high average reflectivity.     

物联网森林火险预警系统研究

该文在研究物联网技术现状基础上,结合现有森林防火技术,如全球定位系统和地理信息系统,搭建仿真模型进行森林火灾实时监测,以提高森林防火的实效性。系统分析表明,模型具有较好的可信度和优越性,并初步探讨了森林防火监测的关键技术。