一种快速光栅条纹中心亚像素坐标提取方法

光栅条纹中心的精确提取会直接影响到线结构光视觉的测量与重建精度。为了解决传统的Steger算法计算量大,且在光条不均匀时提取不精确等问题。基于改进的Steger算法,提出了针对光栅条纹中心的快速亚像素坐标提取方法。通过高斯滤波、形态学等方法得到去复杂背景的激光条纹图像,用自适应阈值法缩小ROI区域,用霍夫变化求取光栅边缘线,求出边缘线中点,然后直线拟合,最后用改进算法提取中心坐标。实验结果表明:与模板法、传统Steger算法等光栅条纹中心提取算法相比,算法的鲁棒性更强,最大提取误差在0.3个像素,平均误差为0.1个像素,平均运行时间相比传统算法减少0.4 s。     

A 2D quadrangular pyramid photoelectric autocollimator with extended angle measurement range

A photoelectric autocollimator with high accuracy and extended measurement range based on the quadrangular pyramid is proposed, and the corresponding algorithms are also deduced. A new image processing algorithm has been proposed to improve the accuracy, and the corresponding errors are also estimated, the error does not exceed half a pixel when the distance between the marks more than two radii. The experimental results have verified that the measurement range of the proposed two-dimensional (2D) quadrangular pyramid photoelectric autocollimator can be increased times than that of the flat mirror photoelectric autocollimator from 10′ to 15′. The accuracy is better than 1″ when the deflection is less than 15′.     

莲花面板堆石坝填筑施工组织设计

莲花面板堆石坝填筑施工中，注意对筑坝料源做出符合工程实际情况的规划：利用其他建筑物的开挖料降低造价；采用分区填筑的措施，加快施工进度和解决寒冷季节施工问题；方便的上坝交通道路网和良好的路面，为高强度填筑提供有力保证；选择合理配套的施工设备使设备得到优化利用。     

基于FT245RL和FPGA的USB接口设计

研究了基于FT245RL和FPGA的USB接口设计方法,介绍了USB通信芯片FT245RL的工作原理及使用方法,设计了FT245RL与FPGA之间硬件电路的连接,给出了FPGA中VHDL的语言描述方法,并介绍了PC机软件的设计方法。实验结果表明,该通信方式数据传输快速稳定,可靠性高。     

基于点云配准的多固态激光雷达标定算法

针对多个固态激光雷达协同工作时,需要准确地进行外参标定的实际需求,提出一种基于点云配准的多固态激光雷达自动标定算法。该标定算法由标定物分割、初始配准和精确配准三个阶段构成。在标定物分割阶段,首先通过叠加多帧非重复扫描数据制作标定点云,再使用半径滤波和体素下采样滤波分割出纹理特征明显的目标点云。在初始配准阶段,使用3D-HARRIS算法提取关键点,并使用方向直方图(SHOT)特征描述子进行特征描述,然后匹配对应点并使用采样一致算法完成初始配准;在精配准阶段使用迭代最近邻(ICP)算法进行精确配准,从而获得精确的外参标定效果。在Bunny兔数据集和现场获得的数据上进行实验,结果表明,当保证配准平均误差小于1 mm的前提下,所提出算法的性能优于多种现有算法。     

配电系统自动化优化运行方式分析

随着我国经济的发展,人们生活水平的提高,居民和各行各业对供电的需求和依赖程度越来越高,传统的供电方式已不能满足用户对供电的要求,这就要采取配电系统自动化运行方式,来保证供电的质量,满足用户的不同要求。     

Recent Progress of Bismuth Effect on All-Inorganic Lead-Free Metal Halide Derivatives: Crystals Structure,Luminescence Properties,and Applications

Bismuth (Bi³⁺)-included lead-free metal halide (LFMH) materials attract much attention in lighting, display, photodetectors, X-ray detectors, and photovoltaic fields, due to the tunable luminescence and optoelectronic performance in response to crystal and electronic structure, morphology, and particle sizes. This review summarizes Bi³⁺-included LFMH materials about their preparation approach, crystal and electronic structure properties, luminescence performance, and emerging applications. Notably, Bi³⁺ ions not only can act as framework cation to construct stable LFMH structure, but can also incorporate into LFMH materials as activators or sensitizers to generate remarkable luminescence tuning and band engineering. The Bi³⁺ effect on the luminescence and optoelectronic properties of LFMH materials, including, promotion of exciton localization, enhancement of light absorption in near-ultraviolet region, action as sensitizer ions to transfer energy to rare earth or transition metal ions and emission of highly-efficient light is systematically summarized. The proposed structure-luminescence relationship offers guidance for the optimization of current Bi³⁺-included LFMH materials and the exploitation of new LFMH derivatives.     

云计算在实验室教学资源管理的应用

为了解决急剧增长的实验室教学资源存储、管理和共享的问题,基于实验室现有的校园局域网,提出云计算的虚拟技术在实验室教学资源管理的应用,实现优质教学资源的统筹管理和共享,进一步提高实验室教学资源的利用率.     

PLZT非晶薄膜光学性质研究

用溶胶－凝胶技术制备了化学组分为５／５０／５０的ＰＬＺＴ非晶薄膜。测试其２００￣８００ｎｍ波长范围的光学透射谱,和２００￣６７０ｎｍ波长范围的椭偏光谱。得到了ＰＬＺＴ（５／５０／５０）非晶薄膜膜厚和光学常数谱（折射率ｎ谱和消光系数κ谱）,并与组分为９／６５／３５的ＰＬＺＴ非晶薄膜的吸收边和折射率进行了比较。     

模拟退火法在椭偏光谱数值反演中的应用

将模拟退火（ＳＡ）法应用于椭偏光谱数值反演,以达到同时得到介质薄膜的厚度和光学常数谱,并对ＳＡ算法作了说明和改进,作为应用实例,计算了Ｓｉ衬底上的ＳｉＯ２薄膜和Ｂａ０．９Ｓｒ０．１ＴｉＯ３（ＢＳＴ）铁电薄膜的膜厚及光学常数谱,同时讨论了椭扁参数φ和△随膜厚及折射率变化的灵敏度。