一种用于古生物与考古学之简单快速非接触性数位化三维化石方法     

黄大一  吉学平  李田广  Eric Sommerlade 《云南地质》2007,26(4):373-386

介绍一种简易非接触性的化石或考古样本制作数位影像三维模型的方法,可供诸多古生物学与考古学之应用,以一个从云南元谋县出土的恐龙头颅为制作范本;整个制作过程,仅需90分钟的时间,产生一个逼真全形全彩的三维模型。本方法所成结果,可用于博物馆展示,或用于古生物或考古学研究。此外,透过多种档案输出格式,数位化的数据,也可配合其它三维软体,如MayaTM,3DS-MaxTM等等,应用于其它下游领域,如恐龙形态学、个体发育学,或生物机械学研究、模拟、动态等等,以及透过数位车床等设备,制作复制品或快速初形制作,体积误差只有0.1%;本文以恐龙头颅介绍本方法的操作。  相似文献   

Near infrared photography for craniofacial anthropometric landmark measurement     

Albert K.  Chong  Renaud  Mathieu 《The Photogrammetric Record》2006,21(113):16-28

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Stability analysis of low-cost digital cameras for aerial mapping using different georeferencing techniques     

Ayman  Habib  Anoop  Pullivelli  Edson  Mitishita  Mwafag  Ghanma  Eui-Myoung  Kim 《The Photogrammetric Record》2006,21(113):29-43

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基于机器视觉的线阵CCD相机成像几何模型   总被引：1，自引：0，他引：1  

刘松林  哈长亮  郝向阳  西勤 《测绘科学技术学报》2006,23(5):387-390

以研究机器视觉技术在运动的流线体类型的工业品在线质量检测领域的应用为基础,重点地研究线阵CCD相机结构、成像原理、成像方式及外部条件,分析了CCD相机成像误差来源及相关解决方法,探讨了线阵CCD相机在质量检测领域的成像模型的具体应用模式,并结合具体的实例内容进行了验证,证明了线阵CCD相机的成像几何模型在这一领域的应用性和适用性,为线阵CCD相机在机器视觉系统中大规模的应用提供了可靠的借鉴意义.  相似文献   

双目序列影像三维运动参数确定   总被引：1，自引：0，他引：1  

张剑清  张春森  贺少军 《武汉大学学报(信息科学版)》2006,31(1):43-46

结合立体视觉的特点．介绍了一套双目视觉系统与完整的、由双目序列影像确定场景中目标运动信息的方法。其主要步骤包括相机检校、运动与立体影像的匹配、运动前后三维特征点的对应以及运动参数的求解。并给出了从真实双目序列影像中获取物体匀速直线运动和匀加速直线运动参数的实验结果。  相似文献   

非正交系坐标测量系统原理及进展   总被引：16，自引：0，他引：16  

李广云 《测绘信息与工程》2003,28(1):4-10

非正交系坐标测量系统是近十几年来发展的一类移动、便携式的测量系统，一般分为电子经纬仪测量系统、全站仪测量系统、数字近景摄影测量系统、激光跟踪测量系统、激光扫描测量系统和关节式坐标机等6类，通过间接测量边长和角度来确定测点的三维坐标值。本文将这6类测量系统归纳为球坐标测量法、三角测量法、三边测量法和导线测量法4种测量方法，讨论了其测量原理，简单介绍了其应用和发展。  相似文献   

DEVELOPMENT OF A LOW-COST MOBILE MAPPING SYSTEM: A SOUTH AMERICAN EXPERIENCE   总被引：2，自引：0，他引：2  

João Fernando C. da Silva  Paulo de Oliveira Camargo  Rodrigo B. A. Gallis 《The Photogrammetric Record》2003,18(101):5-26

This paper presents the prototype of a low-cost terrestrial mobile mapping system (MMS) composed of a van, two digital video cameras, two GPS receivers, a notebook computer, and a sound frame synchronisation system. The imaging sensors are mounted as a stereo video camera on top of the vehicle together with the GPS antennae. The GPS receivers and the notebook computer are configured to record data referred to the vehicle position at a planned time interval. This position is subsequently transferred to the road images. This set of equipment and methods provide the opportunity to merge distinct techniques to make topographic maps and also to build georeferenced road image databases. Both vector maps and raster image databases, when integrated appropriately, can give spatial researchers and engineers a new technique whose application may realise better planning and analysis related to the road environment. The experimental results proved that the MMS developed at the São Paulo State University is an effective approach to inspecting road pavements, to map road marks and traffic signs, electric power poles, telephone booths, drain pipes, and many other applications important to people's safety and welfare. A small number of road images have already been captured by the prototype as a consequence of its application in distinct projects. An efficient organisation of those images and the prompt access to them justify the need for building a georeferenced image database. By expanding it, both at the hardware and software levels, it is possible for engineers to analyse the entire road environment on their office computers.  相似文献   

Calibration of the Wild P32 Camera Using the Camera-On-Theodolite Method     

Y. D. Huang 《The Photogrammetric Record》1998,16(91):97-104

The calibration of phototheodolites such as the Wild P32/T2 combination sometimes involves determining not only the camera interior orientation parameters but also the camera-to-theodolite parameters. The latter become particularly important when the theodolite set orientation parameters are to be used as observations, especially as known quantities for data reduction in subsequent photogrammetric applications. This paper presents experiments to determine these parameters for a Wild P32 camera using a new camera-on-theodolite method, with details of results achieved.  相似文献   

The Role of a Digital Intelligent Camera in Automating Industrial Photogrammetry   总被引：4，自引：1，他引：3  

J. Dold 《The Photogrammetric Record》1998,16(92):199-212

In the past few years the automation of digital industrial photogrammetric systems has increased dramatically. Due to digital image processing software, coded targets and automatic matching methods, a huge number of photogrammetric measurement tasks can be fully automated. In many cases a "one button click" is enough to provide the three dimensional co-ordinates of measured points without any manual interaction, immediately after acquiring the images. The technology of intelligent cameras is a logical step towards automated photogrammetric measurements. An intelligent camera, which has an integrated computer, analyses the image immediately after it is taken. This technology provides not only a much shorter processing time for the images but also more control over the measurement process just when it is needed, during image acquisition. This takes place in the form of real time feedback.
This paper describes the role of a digital intelligent camera in the automation of an industrial photogrammetric measurement system and gives an overview of existing automation techniques in industrial photogrammetry. As an example of an intelligent camera, the performance of the new INCA digital intelligent camera, developed and manufactured by Geodetic Services, Inc. (GSI) and distributed by Leica, is described.  相似文献   

The Principal Point and CCD Cameras   总被引：1，自引：0，他引：1  

T. A. Clarke  X. Wang  & J. G. Fryer 《The Photogrammetric Record》1998,16(92):293-312

The principal point has long been regarded as one of the fundamental parameters in camera calibration. In the age of film based aerial and large format terrestrial cameras, the principal point could be located by a variety of techniques with a certainty of ±10 mm (Carman and Brown, 1961) and this was considered sufficient. However, aerial cameras were precision, purpose built, expensive pieces of equipment where the assembly was painstaking and the location of the principal point measured to a known tolerance. In the digital era, photogrammetrists, and many others, are using cameras which have not been specifically designed or built for photogrammetry. For these cameras there is no requirement for the manufacturers to position the lens in a pre-defined location relative to the image sensing plane or for the lens manufacturer to align the lens elements precisely. In fact, deviations from the centre of the sensor can be a considerable percentage of the extent of the sensor (up to 10 per cent for some zoom lenses (Burner, 1995)). This paper discusses the development of methods of obtaining the location of the principal point, considers the relationship between the principal point and other parameters in the functional model, and shows how the location of this point can be estimated with and without recourse to autocollimation methods.  相似文献