Methods for documenting historical agro-industrial buildings: a comparative study and a simple photogrammetric method

As an important element in the cultural heritage of a people, traditional rural constructions need to be conserved over time. Graphic and metric documentation methods play a key role in the preservation of cultural heritage. In this paper different existing methods of graphic and metric documentation are analysed in order to select the most suitable for the documentation of agro-industrial buildings according to their characteristics. The selected one is a simple close-range photogrammetry method, which is affordable and easy to understand for non experts. It is based on the use of plumb lines, a conventional digital camera and monoscopic restitution. The application of the method is illustrated in a particular case consisting on the graphic and metric documentation of a windmill. Also the accuracy of the method is evaluated in this particular case.     

A practical iterative two-view metric reconstruction with uncalibrated cameras

This paper presents a practical iterative algorithm for two-view metric reconstruction without any prior knowledge about the scene and motion in a nonsingular geometry configuration. The principal point is assumed to locate at the image center with zero skew and the same aspect ratio, and the interior parameters are fixed, so the self-calibration becomes focal-length cali- bration. Existing focal length calibration methods are direct solutions of a quadric composed of fundamental matrix, which are sensitive to noise. A quaternion-based linear iterative Least-Square Method is proposed in this paper, and one-dimensional searching for optimal focal length in a constrained region instead of solving optimization problems with inequality constraints is applied to simplify the computation complexity, then unique rotational matrix and translate vector are recovered. Experiments with simulation data and real images are given to verify the algorithm.     

以科研促进教学的探索与实践

本文探索了在国家精品课程"摄影测量学"教学中如何探索科研向本科教学渗透的途径,重点从科研促进教师教学水平的提高、本科教学内容的丰富、本科实践教学的创新三个方面进行了实践,取得了良好的效果.     

Documentation of cultural heritage using digital photogrammetry and laser scanning

Precise documentation of cultural heritage status is essential for its protection and scientific studies carried out during the restoration and renovation process. The close range photogrammetry has been used successfully for documentation of cultural heritage. With recent developments in computer and information technologies, this well-known traditional method has been replaced with digital close-range photogrammetry. This new method offers us new opportunities such as automatic orientation and measurement procedures, generation of 3D vector data, digital ortho-image and digital surface model. Terrestrial laser scanning is another technology that in recent years has become increasingly popular for documentation which provides very dense 3D points on an object surface with high accuracy. In addition, the 3D model and digital ortho-image can be easily generated using generated 3D point cloud and recorded digital images.     

正常新生儿颅脑多排螺旋CT测量

目录:应用MSCT(多排螺旋CT,multi-slice computed tomography)测量正常新生儿的脑室结构和脑容积,为新生儿脑发育状况评价及颅脑疾病诊断提供CT解剖数据.方法:从进行颅脑CT扫描的新生儿中选取43例无异常发现者的CT图像进行测量,首先在CT机上选择测量距离值示标,分别测量侧脑室前角最大距离等7项指标,每个指标均测量三次,取其均值,并计算脑室指数;利用容积测量软件,用等灰度法均匀涂布所选区域,测量脑容积等9项指标.结果:获得正常新生儿脑室结构CT测量指标平均值和新生儿脑容积9项指标的平均值,且左右小脑半球容积及左右侧脑室容积差异无显著性(P均>0.05).结论:MSCT可准确可靠地测量正常活体新生儿脑室结构和脑容积,从影像学角度认识正常新生儿颅脑的CT解剖.     

基于旋转多基线摄影测量技术的滑坡监测精度分析

介绍了旋转多基线数字近景摄影测量系统的技术特点和具体的实施方案,提出了基于旋转多基线交向摄影方式进行一种无需二次控制的、非接触的、快速便捷的滑坡监测方法．通过对滑坡监测的关键流程阐述及现场试验,分析了不同摄站数、基高比和交会角对其精度的影响规律,实验证明了该方法的可行性,精度可以达到毫米级．     

Built-Heritage Multi-temporal Monitoring through Photogrammetry and 2D/3D Change Detection Algorithms

ABSTRACT

Cultural heritage assets are continuously exposed to risks and hazards. With the main aim to assess deterioration and improve conservation methods, the scientific community has proposed a variety of tools for the early identification of changes in heritage. Multidisciplinary approaches are common in heritage monitoring and conservation. This paper investigates the potential of change detection algorithms developed in remote sensing, and here applied at the monumental scale instead of the geo-spatial one. A monitoring methodology which integrates photogrammetry, 2D/3D change detection, and data interpretation is described and tested on the façade of the church of Stavros tou Missiricou (church of the Cross within the walls) in Nicosia, Cyprus.     

免棱镜测量辅助摄影测量技术应用分析

以大世界陶瓷厂、守银熔块厂外立面改造工程为例,采用免棱镜测量辅助摄影测量技术对建筑外立面进行测量分析。实测结果表明:应用免棱镜测量辅助摄影测量技术进行外立面测绘方法简单、实用,测量精度好,作业效率高,是一种高效、可靠、实用的方法。     

基于“双主线、三层面”模式的课程思政教学--以摄影测量与遥感技术课程为例

针对高职工程测量技术专业核心课程摄影测量与遥感技术,结合其课程内容特点和对应的岗位能力,创设了“双主线、三层面”的课程思政教学模式,按照层级递进、互浸互融开展课程思政,并在实际教学中进行实践应用与推广,取得了“思政育人,专业强人”的实效。     

An analysis of two styles of arm action in the vertical countermovement jump

The aim of this study was to determine the effect of two arm swing techniques, the simultaneous arm swing and the early arm swing, on vertical countermovement jump performance and on the contribution of the arms to vertical movement at the centre of mass (CM) during the propulsion phase. Participants were 28 athletes practicing sports in which the vertical jump constitutes a basic ability. Ground reaction forces were recorded by a force platform and the sagittal plane motion was recorded by a video camera. Although at take-off the vertical velocity (2.7 ± 0.2 m/s for simultaneous technique vs. 2.8 ± 0.2 m/s for early technique; p = 0.040) and position (1.18 ± 0.06 m for simultaneous vs. 1.17 ± 0.05 m for early; p = 0.033) of the CM were significantly different, no difference was observed in jump height (1.56 ± 0.01 m in both techniques). The arm action differed during the initial and final propulsion phases in both styles but the accumulated vertical contribution was similar. The practical implication in sports is that the use of the arm-swing technique to reach the maximum jump height should be determined by tactical demands instead of the technical execution of the arms.