Segments-based progressive TIN densification filter for DTM generation from airborne LIDAR data

Airborne light detection and ranging (LIDAR) has revolutionized conventional methods for digital terrain models (DTMs) acquisition.Ground filtering for airborne LIDAR is one of the core steps taken to obtain a high quality DTM.This paper presents a segments-based progressive TIN (triangulated irregular network) densification (SPTD) filter that can automatically separate ground points from non-ground points.The SPTD method is composed of two key steps:point cloud segmentation and clustering by iterative judgement.The clustering method uses the dual distance to obtain a set of seed points as a coarse spatial clustering process.Then the rest of the valid point clouds are classified iteratively.Finally,the datasets provided by ISPRS are utilized to test the filtering performance.In comparison with the commercial software TerraSolid,the experimental results show that the SPTD method in this paper can avoid single threshold restrictions.The expected accuracy of ground point determination is capable of producing reliable DTMs in the discontinuous areas.     

基于机器视觉的远近光灯切换系统

针对汽车夜间行车时因远近光切换不及时而造成交通事故的问题，设计了一套基于OpenMV 机器视觉模块的汽车远近光灯切换系统。该系统使用Python 语言编程，采用Lab 颜色模型，对采集数据进行图像切割及色块识别，实现对图像的实时处理。场景测试实验证明，该系统具备良好的自适应能力，能实现对远近光灯智能化调节，从而提高驾驶员夜间行驶的安全系数。     

Realization of Super Large Autostereoscopic Display Wall

The suitable lenticular lens for large panel autostereoscopic display was designed,and its optical transmission property was analyzed.The location of the best viewing zones and the relationship between screen size and the optimum viewing distance were proposed.On the basis of the original monitor,rear projection screen material suitable for large panel three-dimensional(3D) monitor and splicing method for 3D display wall were studied.Close to 150-inch-large panel stereo display wall was achieved.     

光的干涉与衍射现象的物理本质

以光学课程教学中反映出来的疑难问题为线索,分析了光的干涉与衍射现象,讨论了干涉与衍射现象中光程差的问题,指出了光程差的不同是光的干涉与衍射现象的本质差别.帮助学生更好地掌握光的干涉与衍射的知识,深刻理解干涉与衍射的区别和联系.     

Microscope laser light scattering spectroscopy and its applications to non-invasivein situ real time measurements on single intact cells

The principle of the technique of microscope laser light scattering spectroscopy, its development and applications to the studies on single intact cells, including our work on non-invasive in situ real time measurements on single intact erythrocyte simultaneously at the levels of cellular, sub-cellular and intracellular molecules, are introduced.     

光波干涉的分析

将一束光波分解为由一列列单原子产生的光波串，并且由此讨论光波的干涉，推导了反映相似光子的光波干涉公式，以及探测器获得光强表达式。同时讨论了反映不同光子的光波的迭加问题，证明了不能相干的原因。最后得出了两束光干涉强度公式。     

Functions and applications of polypyridyl complexes in DNA

The syntheses and desymmetration of a series of novel polypyridyl ligands as well as their complexes, and their DNA-binding properties are reported in this review. The stresses are focused on the functions and potential applications of such complexes as DNA structural probe, DNA molecular light switches, anti-cancer drugs, and photoactivated cleavage agents.     

光波强度对干涉条纹可见度的影响分析

可见度是对干涉条纹清晰程度的度量 .对于理想的相干光 ,影响干涉条纹可见度的主要因素是光波的光强 .本文根据光波干涉的基本原理 ,从理论和实验两个方面定量讨论分析光波强度对干涉条纹可见度的影响 .     

轻钢结构单层厂房整体稳定性的影响因素分析

鉴于当前国内外轻钢结构单层厂房工程事故特点,对其整体稳定性的研究还十分欠缺,不利于轻钢结构单层厂房大力推广和广泛应用;本文通过对一些轻钢结构单层厂房垮塌典型实例进行综合分析,分别阐述了轻钢结构失稳的原因、细部结构对轻钢结构稳定性的影响.通过分析,得出几点对轻钢结构整体稳定分析影响因素有价值的结论和建议.这些结论和建议对轻钢结构设计和施工具有一定的参考价值.     

智能信号灯控制系统的设计

探讨了智能信号灯控制系统设计的相关要求,并针对模糊控制及其实现手段、智能交通信号灯控制依赖的信息检测方法以及系统软件和系统硬件的具体设计3个方面,进行了相关的阐述.