Complex three-dimensional building model simplification method capable of maintaining appearance characteristics

Abstract

The invention discloses a complex three-dimensional building model simplification method capable of maintaining appearance characteristics. The method includes the following steps that: (1) a model surface grid is divided into a plurality of sub-grids according to topological relations and color features and on the basis of a breadth-first search-based grid segmentation; (2) the geometrical simplification error calculation and texture simplification error calculation are integrated to calculate the simplification error of each edge of the model, and a simplification error formula comprehensively considers grid segmentation information as well as geometric error and texture error; and (3) with the half-edge collapse simplification of texture discontinuity features considered, edges with thesmallest error are selected from the grid so as to be subjected to half-edge collapse simplification, and after the simplification is performed, texture coordinate adjustment is carried out. After the above steps are completed, the simplification error of the adjacent edges is updated, and half-edge collapse is continued until a simplification rate reaches a set threshold. With the method adopted, geometry and texture can be effectively balanced, and a simplification result has good simplification quality and a great visual effect.

Description

technical field [0001] The invention relates to the technical field of three-dimensional geographic information processing, and is mainly used for simplification of building model data in three-dimensional urban scenes. Background technique [0002] At present, the research on the simplification of 3D building models mainly includes the following aspects: [0003] (1) Simplified method based on projection [0004] This kind of method projects the 3D building model to the ground plane, and then borrows the traditional 2D mapping synthesis technology to simplify the elements, and finally restores it into a 3D model. Sester et al. parameterized the building base and constructed an energy function, and searched for the best simplified result based on the least squares method. Fan et al. added the intersection test between the building base and the roof in the simplified algorithm, so as to correct the simplified building model and ensure the integrity of the model, but it is s...

AI Technical Summary

Problems solved by technology

However, a considerable number of simplification methods currently only perform pure geometric simplification without considering the texture information of the model, making the simplification results prone to texture deformation

Although other methods increase the consideration of texture information, the model structure targeted at is relatively simple, and the texture features are not rich enough.

Therefore, research on the simplification of complex 3D building models considering texture features is still relatively rare

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