Functional data analysis in shape analysis

Mid-level processes on images often return outputs in functional form. In this context the use of functional data analysis (FDA) in image analysis is considered. In particular, attention is focussed on shape analysis, where the use of FDA in the functional approach (contour functions) shows its superiority over other approaches, such as the landmark based approach or the set theory approach, on two different problems (principal component analysis and discriminant analysis) in a well-known database of bone outlines. Furthermore, a problem that has hardly ever been considered in the literature is dealt with: multivariate functional discrimination. A discriminant function based on independent component analysis for indicating where the differences between groups are and what their level of discrimination is, is proposed. The classification results obtained with the methodology are very promising. Finally, an analysis of hippocampal differences in Alzheimer’s disease is carried out.     

电气工程采购报价要点

结合在工程公司从事电气采购的工作经历,提出一名电气采购工程师分别应从雇主、工程项目部、专业设计工程师、分包商处和其他渠道,全面、准确地了解工程采购中的相关信息和注意事项,以便做出合理的工程采购报价。     

Recognizing algebraic surfaces from their outlines

The outline in a single picture of a generic algebraic surface of degree three or greater completely determines the projective geometry of the surface. The result holds for a generic perspective view of a generic algebraic surface, where the camera calibration parameters and the focal point are unknown. Known camera calibration appears not to reduce the projective ambiguity. The result is constructive.     

Recognising Algebraic Surfaces from Two Outlines

Photographic outlines of 3 dimensional solids are robust and rich in information useful for surface reconstruction. This paper studies algebraic surfaces viewed from 2 cameras with known intrinsic and extrinsic parameters. It has been known for some time that for a degree d=2 (quadric) algebraic surface there is a 1-parameter family of surfaces that reproduce the outlines. When the algebraic surface has degree d>2, we prove a new result: that with known camera geometry it is possible to completely reconstruct an algebraic surface from 2 outlines i.e. the coefficients of its defining polynomial can be determined in a known coordinate frame. The proof exploits the existence of frontier points, which are calculable from the outlines. Examples and experiments are presented to demonstrate the theory and possible applications.

解剖与扫描 对比两种揭示内部的模式

文章对比了揭示建筑内部的两种模式。剖面是建筑的"解剖",它在西方的传统中有很重要的意义。然而,另一种模式"扫描"揭示了一种更为连续的、关联性的和动态的理解去穿越建筑生命的整体,这是在中国传统中描绘建筑的主导方式。这两种模式分别代表了虚构的轮廓和实质的表面的思维方式。自20世纪初,解剖的概念并没有贯穿到中国新的建筑设计语言之中。     

Robust Surface Fitting from Two Views using Restricted Correspondence

The restricted correspondence problem is the task of solving the classical stereo correspondence problem when the surface being observed is known to belong to a family of surfaces that vary in a known way with one or more parameters. Under this constraint the surface can be extracted far more robustly than by classical stereo applied to an arbitrary surface, since the problem is solved semi-globally, rather than locally for each epipolar line. Here, the restricted correspondence problem is solved for two examples, the first being the extraction of the parameters of an ellipsoid from a calibrated stereo pair. The second example is the estimation of the osculating paraboloid at the frontier points of a convex object.

基于圆迹SAR的建筑物轮廓信息提取

利用圆迹SAR 对目标的全方位观测的特点,该文提出一种基于圆迹 SAR 数据的建筑物轮廓信息提取以及所处地面的高度估计的方法。首先,通过雷达立体测量的方法粗估计出目标建筑物所处地面的海拔高度。然后,以该高度为基准上下一定范围内划分多个成像平面层,在各个成像平面上对建筑物进行圆迹SAR成像。最后,在圆迹SAR图像中选择建筑物二次反射亮线构成封闭线框的一副图像,从该幅图像中提取建筑物在水平面的轮廓信息,同时将该图像对应的成像平面高度确定为目标建筑物所在地面的高度。P波段机载圆迹SAR实测数据验证了该方法的有效性。     

综述城市地下环形隧道及其设计要点

在城市的重点功能区建设中,越来越多地采用在市政道路下设置地下环形隧道,来增加区域道路交通资源、净化地面交通和提升区域的交通品质.本文针对地下环形隧道的功能及其交通特点进行分析,其中对地下环形隧道的设置原则、设计标准、出入口布置等方面做了剖析.然后结合工程实例,提出了城市地下环形隧道规划设计中的要点,为城市地下环形隧道的规划设计提供参考.