针对轮廓复杂多变、细节信息丰富等多因素,导致变电建筑重建效果不佳的问题,提出基于轮廓拼接的变电建筑数字三维重建算法。基于改进Snake模型提取变电建筑目标轮廓,为后续的三维重建提供关键轮廓信息;基于获取的二维轮廓信息,利用运动...针对轮廓复杂多变、细节信息丰富等多因素,导致变电建筑重建效果不佳的问题,提出基于轮廓拼接的变电建筑数字三维重建算法。基于改进Snake模型提取变电建筑目标轮廓,为后续的三维重建提供关键轮廓信息;基于获取的二维轮廓信息,利用运动恢复结构(Structure from Motion,SfM)完成变电建筑的三维轮廓重建;通过Jaccard距离和最近点迭代(ICP)算法将多个轮廓碎片精确拼接为完整的变电建筑三维轮廓,并使用附加三维线约束的网格优化算法对所构建三维轮廓实行优化,完成最终的变电建筑数字三维重建。实验结果表明:所提方法在变电建筑轮廓及三维重建中展现出高精度、细节保留良好且整体连贯性佳的优势。展开更多
高精度、高分辨率的地形地貌数据是活动构造定量研究的基础。摄影测量方法的出现和快速发展为获取高精度地形地貌数据提供了一种经济有效的技术手段。相比于传统的测量方法,摄影测量方法可在大范围内同时进行,不受地面通视条件的限制,...高精度、高分辨率的地形地貌数据是活动构造定量研究的基础。摄影测量方法的出现和快速发展为获取高精度地形地貌数据提供了一种经济有效的技术手段。相比于传统的测量方法,摄影测量方法可在大范围内同时进行,不受地面通视条件的限制,且测量成本相对较低。尤其近年来,随着计算机视觉理论及高效的自动特征匹配算法的发展,一种名为"Structure from Motion"(SfM)的三维重建技术被引入摄影测量方法中,极大地提高了摄影测量的自动化程度。文中介绍了摄影测量方法的基本原理及发展历程,并综述了摄影测量方法在活动构造研究中的应用,最后通过SfM摄影测量方法在活动构造研究中的1个具体应用实例,展示了摄影测量方法在活动构造定量研究中的巨大应用潜力。展开更多
Antimony selenide(Sb2Se3) films are widely used in phase change memory and solar cells due to their stable switching effect and excellent photovoltaic properties. These properties of the films are affected by the film...Antimony selenide(Sb2Se3) films are widely used in phase change memory and solar cells due to their stable switching effect and excellent photovoltaic properties. These properties of the films are affected by the film thickness. A method combining the advantages of Levenberg–Marquardt method and spectral fitting method(LM–SFM) is presented to study the dependence of refractive index(RI), absorption coefficient, optical band gap, Wemple–Di Domenico parameters, dielectric constant and optical electronegativity of the Sb2Se3films on their thickness. The results show that the RI and absorption coefficient of the Sb2Se3films increase with the increase of film thickness, while the optical band gap decreases with the increase of film thickness. Finally, the reasons why the optical and electrical properties of the film change with its thickness are explained by x-ray diffractometer(XRD), energy dispersive x-ray spectrometer(EDS), Mott–Davis state density model and Raman microstructure analysis.展开更多
文摘针对轮廓复杂多变、细节信息丰富等多因素,导致变电建筑重建效果不佳的问题,提出基于轮廓拼接的变电建筑数字三维重建算法。基于改进Snake模型提取变电建筑目标轮廓,为后续的三维重建提供关键轮廓信息;基于获取的二维轮廓信息,利用运动恢复结构(Structure from Motion,SfM)完成变电建筑的三维轮廓重建;通过Jaccard距离和最近点迭代(ICP)算法将多个轮廓碎片精确拼接为完整的变电建筑三维轮廓,并使用附加三维线约束的网格优化算法对所构建三维轮廓实行优化,完成最终的变电建筑数字三维重建。实验结果表明:所提方法在变电建筑轮廓及三维重建中展现出高精度、细节保留良好且整体连贯性佳的优势。
文摘高精度、高分辨率的地形地貌数据是活动构造定量研究的基础。摄影测量方法的出现和快速发展为获取高精度地形地貌数据提供了一种经济有效的技术手段。相比于传统的测量方法,摄影测量方法可在大范围内同时进行,不受地面通视条件的限制,且测量成本相对较低。尤其近年来,随着计算机视觉理论及高效的自动特征匹配算法的发展,一种名为"Structure from Motion"(SfM)的三维重建技术被引入摄影测量方法中,极大地提高了摄影测量的自动化程度。文中介绍了摄影测量方法的基本原理及发展历程,并综述了摄影测量方法在活动构造研究中的应用,最后通过SfM摄影测量方法在活动构造研究中的1个具体应用实例,展示了摄影测量方法在活动构造定量研究中的巨大应用潜力。
基金supported by the National Natural Science Foundation of China (Grant Nos. 62075109, 62135011, 62075107, and 61935006)K. C. Wong Magna Fund in Ningbo University。
文摘Antimony selenide(Sb2Se3) films are widely used in phase change memory and solar cells due to their stable switching effect and excellent photovoltaic properties. These properties of the films are affected by the film thickness. A method combining the advantages of Levenberg–Marquardt method and spectral fitting method(LM–SFM) is presented to study the dependence of refractive index(RI), absorption coefficient, optical band gap, Wemple–Di Domenico parameters, dielectric constant and optical electronegativity of the Sb2Se3films on their thickness. The results show that the RI and absorption coefficient of the Sb2Se3films increase with the increase of film thickness, while the optical band gap decreases with the increase of film thickness. Finally, the reasons why the optical and electrical properties of the film change with its thickness are explained by x-ray diffractometer(XRD), energy dispersive x-ray spectrometer(EDS), Mott–Davis state density model and Raman microstructure analysis.
