Method and system for automatically extracting three-dimensional model of building, storage medium and equipment

Abstract

The invention relates to a method and system for automatically extracting a three-dimensional model of a building, a storage medium and equipment, and the method comprises the steps: obtaining a grid model of a target building, and carrying out the sampling, and obtaining a series of sample elevation values and corresponding sample contour lines; calculating the reference direction of each sample contour line, and carrying out merging and direction correction processing on vertexes on the sample contour lines; selecting a sample contour line of which the height is equal to the ground height as an initial contour line, and sequentially calculating an elevation change value between two adjacent sample contour lines from bottom to top; and gradually constructing a three-dimensional model of the target building. A series of sample contour lines are obtained by sampling a grid model, vertex merging and direction calibration processing are carried out after the reference direction is determined, it is ensured that the sample contour lines are clear and accurate, nearby noisy points are removed, then the three-dimensional model of the target building is constructed step by step, the precision of the three-dimensional model of the target building is greatly improved, the algorithm is simple, and the implementation is easy. And the method is suitable for large-area popularization and application.

Description

technical field [0001] The invention relates to the technical field of photography vehicles, in particular to a method, system, storage medium and equipment for automatically extracting a three-dimensional model of a building. Background technique [0002] With the continuous development of aerial photography technology, a new method of obtaining 3D reconstruction of urban scenes has emerged: oblique 3D photography; oblique photography is to carry multiple sensors on the same aircraft platform, and at the same time from one vertical, four oblique, etc. Images are collected from five different angles, and the 3D modeling method based on multi-view images restores the 3D structure of the target object and obtains the surface texture information of the 3D model at the same time. In recent years, with the increasing maturity of UAV technology, the cost of obtaining aerial image data has also been greatly reduced. Therefore, the construction of urban 3D scenes based on multi-vie...

AI Technical Summary

Problems solved by technology

However, the accuracy of the buildings obtained in this way is very low, which cannot meet the requirements of actual application scenarios. The calculation method is large and the efficiency is low, which is not conducive to popularization and use.

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