Method for filtering out detected surface in live-action map on basis of normal vector

Abstract

The invention relates to a method for detecting surfaces in a live-action map on the basis of a vertical surface of a building. The method comprises the following steps of semi-automatically extracting the vertical surface of the building in three-dimensional laser point cloud data at first; performing automatic matching to obtain the central coordinates of a panoramic site closest to the vertical surface according to the coordinates of the three-dimensional space of the vertical surface, and performing calculation to obtain the normal vector of the vertical surface; and taking the coordinates of an optional point on the vertical surface when in surface detection of the building in the live-action map, and calculating the value of the vector from the point to the center of the panoramic site to obtain the included angle between the value of the vector and the normal vector of the current vertical surface. When the included angle is smaller than 90 degrees, the vertical surface is an effective detected surface; and when the included angle is greater than 90 degrees, the vertical surface is filtered out. By the method, the property of the normal vector is applied to the data of the vertical surface of the three-dimensional building; the vertical surface of the back surface of the building is filtered out by the property of the normal vector of the surface so as to obtain correct vertical surface information; and accuracy of surface detection in the live-action map is improved.

Description

technical field [0001] The invention relates to a method for filtering detected surfaces based on normal vectors in a real-scene map, and belongs to the technical field of surveying and mapping information. Background technique [0002] Real-world map is a new experience method of real-time browsing on the Internet from the first perspective, also known as street view map. Real-world maps are currently hot spots on the Internet and the development direction of map services. Internet giants at home and abroad have launched their own street view products, such as Google Street View and SOSO Street View. [0003] In order to improve the practicability of the real map, we implemented the functional application of building detection (surface) in the real map, which is used to quickly jump and locate the real site, which greatly enhances the browsing experience of the real map. However, in the actual street view map application, when the building surface detection experience is p...

AI Technical Summary

Problems solved by technology

However, in the actual street view map application, there will be a phenomenon of penetration when the building face detection experience is performed, that is, the facade of the building that should not be detected is detected.

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