正射影像拼接线生成算法研究.pdfVIP

摘 要 正射影像拼接，即正射影像的镶嵌，就是为了获得覆盖目标区域更广的正射 影像，将区域内多张正射影像拼接成具有统一坐标系的正射影像图，以便于统一 地进行处理、解译、分析和研究。高质量的正射影像的拼接需要生成对应原始影 像的拼接区域，即需要生成拼接线。本文要研究的内容就是正射影像拼接中拼 接线的生成，完成的工作 ：1、对给定的影像内外方位元素和地理平面高程， 根据voronoi 图原理，设计离散格网的计算方法，自动生成影像的拼接线。2、 对生成的区域进行边界跟踪，设计点、段、边界的数据结构；实现了对两个 相邻区域边界段的跟踪，在此基础上实现了同一个区域的边界跟踪,形成对应 每幅原始影像的采样区域； 本文算法的特点是：生成区域自动化，且速度较快；并且通过跟踪算法 形成的区域边界，是连续的，可编辑的。这为正射影像的自动拼接和智能拼 接线的生成提供了高效的数据基础。 关键词：拼接线；影像镶嵌；Voronoi 图；边界跟踪 I Abstract Themosaicofdigitalorthophoto,inordertoacquireacompletetargetimagesfora bigger area, put a serial of aerial images one by one according to their sequence and features in the unified coordinate system to get better processing, interpretation, analyzingandresearching.High-qualityortho-imagemosaicneedsplicingregionofthe original images, inthe otherword, need to generatemosaic lines.The contents ofthis paper is to study mosaic lines in the generation of image splicing, works will be completedintheresearch :First,forthegivenelementsofinteriorandexternalandthe geographicelevationplane,withtheprincipleofVoronoidiagram,acalculationmethod of discrete grid is designed, and the mosaic line of the images is generated automatically .Furthermore, work are achieved of tracking the boundary of the region ,and designing a data structure about the boundary points ,boundary lines and sampling region, tracking the boundary of two adjacent regions ,then tracking all boundary linesofoneregion onthisbasis ,anddeterminingthe samplingareaofeach originalimage. The strong points of the algorithm in this paper is as follows : generate the samplingareaautomatically,andwithahighlyspeed;Besides,theregionalboundaryis continuous and can manually modified.All ofthese make the basis ofthe orthoimage automaticandintelligentgenerationofmosaiclines. Keywords Stitchingline Imagemosaic Voronoidiagram BoundaryTracing