基于點(diǎn)云的數(shù)據(jù)處理技術(shù)及三維重建研究
[Abstract]:With the continuous updating of spatial data acquisition equipment, the single data acquisition method can not meet the needs of 3D reconstruction. For example, UAV aerial photography image scale, wide angle of view, high present situation, but the lack of building facade information; The data of point cloud collected by 3D laser scanner have high accuracy, abundant information of ground objects, no dead angle but large area topography, and the collection of point cloud on top of building is very difficult. Based on this, a combination of UAV technology and 3D laser scanning technology is proposed, and the data processing technology and reconstruction method of the two technologies are discussed. Based on the summary of low altitude photogrammetry system, this paper analyzes the flow chart of UAV field data acquisition and the method of setting up image control points, and discusses the processing method of internal data in view of the process of aerial image acquiring point cloud data. Secondly, combining with the working principle of 3D laser scanner and the method of data acquisition in field of work, the principle of setting target is analyzed, and the registration method of multi-view cloud is discussed, and different experimental schemes are designed. The accuracy of different registration methods and the effect of different number of groups on registration accuracy are compared and analyzed. Thirdly, combined with the existing research results, this paper focuses on the point cloud data processing technology, respectively from the point cloud noise reduction, point cloud reduction and point cloud classification three aspects of analysis and research. Based on the characteristics of the study area, the methods of noise reduction and terrain reduction are explored. Finally, based on the lack of accuracy of 3D reconstruction model of mixed terrain and ground objects, the paper uses decision tree classification method to divide 3D reconstruction process into two simultaneous processes: terrain 3D reconstruction and ground object 3D reconstruction. Then the reconstruction method is optimized and the modeling efficiency is improved on the basis of ensuring the modeling accuracy.
【學(xué)位授予單位】:河北工程大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:P225.2;P23
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