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  • 标题:Orthoprojection with contrast equalization using terrestrial laserscanning
  • 本地全文:下载
  • 作者:Z. Kibedy ; K. Szocs ; A. Barsi
  • 期刊名称:ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
  • 印刷版ISSN:2194-9042
  • 电子版ISSN:2194-9050
  • 出版年度:2006
  • 卷号:XXXVI Part 5
  • 出版社:Copernicus Publications
  • 摘要:The production time of true orthophotos become significantly shorter applying laser scanning. In this paper the comparison of laser scanning executed from moving vehicle and fixed station as well as the image capture is presented, together with some methods of orthophoto mosaicking and their results. There is a fundamental difference between acquiring and matching point clouds of moving and fixed scanners. Hiding can be applied in scanning from fixed station and taking pictures from the same point. The position of the camera is not coincided with the origin of the scanned point cloud, which must be considered in the processing. It is advantageous that the outer orientation elements of the images can be determined automatically; furthermore several images can be captured from the same point with the same outer orientation. The color difference between the imagery of different stations can be reduced, if a series is taken from one position; therefore the post-processing becomes easier. If the required full size orthoimage is defined previously with the necessary resolution, the geometric matching of the orthophoto pieces is not complicated. The positions of all stations as well as the orientation data of the taken pictures are automatically derived by the determination of the first scanner station in the coordinate system of the orthophoto, The color difference appearing in the mosaicking are to be adjusted by Erdas Imagine. The experiences are summarized and further methods are recommended to be tested
  • 关键词:True Orthophoto; Terrestrial laser scanning; Surface modelling; Visualisation; Contrast equalization
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