Unmanned aerial vehicle aerial photography sequence image-based slope three-dimension reconstruction method

Abstract

The invention relates to an unmanned aerial vehicle aerial photography sequence image-based slope three-dimension reconstruction method. The method includes the following steps that: feature region matching and feature point pair extraction are performed on un-calibrated unmanned aerial vehicle multi-view aerial photography sequence images through adopting a feature matching-based algorithm; the geometric structure of a slope and the motion parameters of a camera are calculated through adopting bundle adjustment structure from motion and based on disorder matching feature points, and therefore, a sparse slope three-dimensional point cloud model can be obtained; the sparse slope three-dimensional point cloud model is processed through adopting a patch-based multi-view stereo vision algorithm, so that the sparse slope three-dimensional point cloud model can be diffused to a dense slope three-dimensional point cloud model; and the surface mesh of the slope is reconstructed through adopting Poisson reconstruction algorithm, and the texture information of the surface of the slop is mapped onto a mesh model, and therefore, a vivid three-dimensional slope model with high resolution can be constructed. The unmanned aerial vehicle aerial photography sequence image-based slope three-dimension reconstruction method of the invention has the advantages of low cost, flexibility, portability, high imaging resolution, short operating period, suitability for survey of high-risk areas and the like. With the method adopted, the application of low-altitude photogrammetry and computer vision technology to the geological engineering disaster prevention and reduction field can be greatly prompted.

Description

technical field [0001] The invention relates to a method for three-dimensional reconstruction of a slope based on a UAV aerial photograph sequence image, and belongs to the technical fields of geological engineering, photogrammetry and computer application. Background technique [0002] Under the action of earthquakes, rainfall and human engineering activities, slope geological disasters occur frequently, such as landslides, mud-rock flows, collapses, etc., which have seriously restricted the sustainable development of cities. Quickly and accurately establishing a 3D model of a slope can not only provide basic data for slope deformation monitoring, but also has important value for disaster assessment and emergency rescue after slope instability. [0003] At present, the methods for 3D reconstruction of slopes mainly include 3D laser scanning and interpretation of remote sensing images. Although 3D laser scanning can obtain a high-precision 3D model of the slope, the laser s...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a three-dimensional reconstruction method for slopes based on UAV aerial photography sequence images in view of the current situation of frequent slope disasters and the limitations of existing three-dimensional modeling methods for slopes, such as high cost and poor flexibility.

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