共查询到20条相似文献，搜索用时 62 毫秒
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Nicolas Paparoditis Jean-Philippe Souchon Gilles Martinoty Marc Pierrot-Deseilligny 《ISPRS Journal of Photogrammetry and Remote Sensing》2006,60(6):400
The IGN digital camera project was established in the early 1990s. The first research surveys were carried out in 1996 and the digital camera was first used in production in 2000. In 2004 approximately 10 French departments (accounting for 10% of the territory) were covered with a four-head camera system and since summer 2005 all IGN imagery has been acquired digitally. Nevertheless the camera system is still evolving, with tests on new geometric configurations being continuously undertaken. The progressive integration of the system in IGN production workflows has allowed IGN to keep the system evolving in accordance with production needs. Remaining problems are due to specific camera characteristics such as CCD format, the optical quality of off-the-shelf lenses, and because some production tools are ill-adapted to digital images with a large dynamic range. However, when considering the pros and cons of integrating these images into production lines, the disadvantages are largely balanced by the numerous benefits this technology offers. 相似文献
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基于普通数码相机的核线相关方法 总被引：2，自引：0，他引：2
用普通数码相机获取数字影像具有一定的优势，但由于普通数码相机是一种非量测相机，其数据处理需要特殊方法，介绍了一种适合普通数码相机进行核线相关的方法，实验数据表明该方法是可行的。 相似文献
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传统视觉测量系统需要双CCD相机同时拍摄两幅不同角度的数字图像,成本昂贵且难以确定两CCD相机问的空间相对位置。为此,建立一种结合CCD相机的摄像功能和经纬仪高精度测角功能的视觉测量系统。基于该系统提出一种用单CCD相机实现双目视觉原理的数学模型。实验结果证明系统与数学模型的可行性。 相似文献
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Sabry F. El-Hakim Claus Brenner Gerhard Roth 《ISPRS Journal of Photogrammetry and Remote Sensing》1998,53(6):379-391
Creating virtual environment models often requires geometric data from range sensors as well as photometric data from CCD cameras. The model must be geometrically correct, visually realistic, and small enough in size to allow real-time rendering. We present an approach based on 3D range sensor data, multiple CCD cameras, and a colour high-resolution digital still camera. The multiple CCD cameras provide images for a photogrammetric bundle adjustment with constraints. The results of the bundle adjustments are used to register the 3D images from the range sensor in one coordinate system. The images from the high-resolution still camera provide the texture for the final model. The paper describes the system, the techniques for the registration of the 3D images, the building of the efficient geometric model, and the registration and integration of the texture with a simplified geometric model. 相似文献
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基于DLT模型的一种数码相机检校方法 总被引：1，自引：0，他引：1
直接线性模型法是相机检校中常用的一种方法，在其基础上提出了一种适合计算机处理的数码相机检校方法，其通过改变像方元素的单位，就可使用现有的摄影测量程序直接处理数字影像。文中进一步讨论了像素尺寸大小对系统误差的影响，并对像素大小的必要测定精度进行了公式推导。最后的实验结果表明，该方法可以获得较好的校准结果。 相似文献
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给出了数字天顶摄影仪的基本结构和垂线偏差测量的基本算法,结合仪器和测量过程,分析了垂线偏差测量误差。数字天顶摄影仪的自动化程度和测量精度都高于传统的天文大地测量。 相似文献
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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
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
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通过对民用数码相机获取数码影像产生的误差来源进行分析,提出利用数码相机获取数码影像,并对其相机畸变差进行纠正,达到可量测化的目的,探讨低成本、多途径获取可量测化立体像对的可能性及方法。 相似文献
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The Z/I Imaging Digital Camera System 总被引：1，自引：0，他引：1
Market needs for airborne and spaceborne imagery used in photogrammetry and GIS applications are changing. Fundamental changes in sensors, platforms and applications are currently taking place. Most recently, new high resolution spaceborne sensors have become available. Besides classical photogrammetry, new thematic applications will drive the future image market. Savings in cost and time, together with the need for higher and reproducible radiometric resolution or spectral information will push forward the change from analogue to digital imagery. High resolution satellites will compete with airborne film-based photography and digital camera systems.
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system. 相似文献
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system. 相似文献
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在学习PHOTOMOD基本功能的基础上,探索该软件对框幅式影像、卫星影像和推扫式三线阵影像进行空三加密的实现方法。其中,框幅式的实验数据包括传统RC-30胶片式影像以及带POS(POSition Orientation System)数据的UCE相机和UCXP_WA相机拍摄的影像;卫片的实验数据为法国的Pleiades卫星影像;推扫式的实验数据为ADS80 L1级影像。本文从空三加密中内定向、航线划分、同名点匹配和平差计算等主要功能出发,探索并总结了软件对以上影像进行空三加密的实现方法以及存在的主要问题。本文的试验和研究对空三加密和4D产品生产具有一定的参考价值和借鉴意义。 相似文献
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对普通CCD数字相机获得的同一场景的3张未标定影像依次进行Harris角点提取、RANSAC算法估计基本矩阵、RANSAC算法估计三焦点张量,以获得同一参考系统下3个投影矩阵,最后进行相机自标定处理,从而获得相机的内部参数,为下一步多张影像的自标定和3维场景的自动重建和量测奠定了基础。实验结果表明,所述的同一场景3张影像的相机自动标定综合算法是正确有效的。 相似文献
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精度是高分辨率遥感和摄影测量的关键。影响精度的因素分为：成像系统误差和数据处理误差。航空平台系统误差较为复杂,因此本文聚焦航空成像系统设计方法,以降低航空成像系统误差为目标,从源头上为数据处理精度提供保障。目前航空数字成像系统种类繁多,但缺乏统一物理模型,使得航空相机系统采用人工拼接为多刚体（多相机）,结构复杂、体积大、成本高、精度难以刻画,容易受到震动和温度等因素影响,成像系统装机实用精度只能达到毫米量级。为此,本文构建航空遥感平台通用物理模型,由此归纳出现有航摄相机的四类对偶技术特征：一次-二次成像、外拼接-内拼接、单基线-多基线、非严格-严格中心投影;以此建立可变基高比时空模型,从而实现数字航摄相机内部光学机械参数与地表高程精度的表达,实现地表高程精度-光机参数贯通;进一步设计二次成像数字航摄相机原型系统及宽波段临边成像光谱仪,为目前多刚体拼接的一次成像航摄相机构建向精密光机单刚体、折反式同光路构建提供原型依据,为数字航摄系统构建和工业化奠定理论基础和原型实例参考。 相似文献
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Many of the processes involved in soil erosion have dimensions on the millimetre scale. Modelling and quantification of such processes require information on soil surface topography with adequate resolution. The purpose of this study was to generate digital elevation models (DEMs) from soil surfaces with high spatial and temporal resolution. Digital photogrammetry was applied for measuring erosion rates on complex-shaped soil surfaces under laboratory rainfall conditions. A total of 60 DEMs were generated, covering a planimetric area of 16 m2 . The DEMs had a grid resolution of 3 mm. A vertical precision of approximately 1 mm was desired for DEM analysis. A consumer-grade digital camera was used for image acquisition. The camera was calibrated using BLUH software. Homologous points in overlapping images were identified with least squares matching software. Irregularly spaced object coordinates were interpolated to a regular grid in a geographic information system. The resulting DEMs represented the soil surface well. A precision of 1·26 mm in the vertical was attained. The precision of DEM production was limited to camera calibration. Improvements of the setup presented could include the use of better control points and more advanced image matching strategies for identification of homologous points. The DEMs allowed for detailed analysis of soil surface evolution. 相似文献
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三维城市建模中的建筑墙面纹理快速获取 总被引：4，自引：0，他引：4
阐述了建筑墙面纹理快速重建需要解决的问题和实现策略,并从实用、经济的角度出发,对纹理影像数据源的选择、获取方式,纹理快速提取系统的构建以及重建过程中影像方位元素获取、轮廓线影像匹配关键算法的实现等各方面进行了具体探讨,最后以数码相机拍摄的近景影像和直升机机载视频序列影像作为纹理数据源分别设计和实现了两个软件系统,进行了快速重建实验,并取得了较好的纹理重建效率和效果。 相似文献