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排序方式: 共有110条查询结果,搜索用时 15 毫秒
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介绍了一个建筑物阴影检测的模型。首先利用摄影测量学原理来计算阴影坐标。即用数字表面模型(digitalsurfacemodel,缩写为DSM)和太阳高度和方位来计算建筑物阴影的空间坐标,并由相机模型计算出每个阴影单元对应的扫描行和相机空间坐标。由高度场光线跟踪判断阴影的可见性,对可见阴影计算出它在投影图像上的坐标。然后在这个结果的基础上再对图像进行阴影的细分割。 相似文献
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Joanne Poon Clive S. Fraser Zhang Chunsun Zhang Li Armin Gruen 《The Photogrammetric Record》2005,20(110):162-171
The growing applications of digital surface models (DSMs) for object detection, segmentation and representation of terrestrial landscapes have provided impetus for further automation of 3D spatial information extraction processes. While new technologies such as lidar are available for almost instant DSM generation, the use of stereoscopic high-resolution satellite imagery (HRSI), coupled with image matching, affords cost-effective measurement of surface topography over large coverage areas. This investigation explores the potential of IKONOS Geo stereo imagery for producing DSMs using an alternative sensor orientation model, namely bias-corrected rational polynomial coefficients (RPCs), and a hybrid image-matching algorithm. To serve both as a reference surface and a basis for comparison, a lidar DSM was employed in the Hobart testfield, a region of differing terrain types and slope. In order to take topographic variation within the modelled surface into account, the lidar strip was divided into separate sub-areas representing differing land cover types. It is shown that over topographically diverse areas, heighting accuracy to better than 3 pixels can be readily achieved. Results improve markedly in feature-rich open and relatively flat terrain, with sub-pixel accuracy being achieved at check points surveyed using the global positioning system (GPS). This assessment demonstrates that the outlook for DSM generation from HRSI is very promising. 相似文献
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讨论了根据影像匹配的结果将DSM修正成DTM的方法。本文针对城市地区航空影像的立体匹配结果,结合影像的结构纹理特征,提出了一种自动修正影像匹配结果以获得正确的DTM的方法。 相似文献
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Pix4Dmapper在无人机航摄应急救灾项目中的应用研究 总被引:2,自引:0,他引:2
汪雅婕 《测绘与空间地理信息》2016,(9):202-203
无人机由于其独特的航摄优势,在灾害应急处理等特殊事件中,发挥着越来越重要的作用。本文结合一次山体滑坡救灾项目,阐述了使用Pix4Dmapper软件对无人机航摄数据进行快速处理,并获取正射影像图和数字表面模型的方法,通过数据分析和评估,证明了此方法的可行性和有效性。 相似文献
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在对传统的分层设色晕渲理论应用于城区DSM的可视化技术进行充分研究的基础上,提出了一种基于高程直方图的自适应高程分级方法。该方法通过高程直方图研究城区地形、地物的高程分布及变化特征,自适应建立高程带分级模型。实验表明,提出的晕渲图制作方法兼顾了地貌形态和地物特征的表达,成果色彩过渡自然,层次清晰,地形、地物区分明显,有较强的艺术性和实用价值。 相似文献
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Targeting at a reliable image matching of multiple remote sensing images for the generation of digital surface models, this paper presents a geometric-constrained multi-view image matching method, based on an energy minimization framework. By employing a geometrical constraint, the cost value of the energy function was calculated from multiple images, and the cost value was aggregated in an image space using a semi-global optimization approach. A homography transform parameter calculation method is proposed for fast calculation of projection pixel on each image when calculating cost values. It is based on the known interior orientation parameters, exterior orientation parameters, and a given elevation value. For an efficient and reliable processing of multiple remote sensing images, the proposed matching method was performed via a coarse-to-fine strategy through image pyramid. Three sets of airborne remote sensing images were used to evaluate the performance of the proposed method. Results reveal that the multi-view image matching can improve matching reliability. Moreover, the experimental results show that the proposed method performs better than traditional methods. 相似文献
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