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Multi-resolution modeling method for three dimensional model of complex building

A three-dimensional model and multi-resolution technology, applied in the field of geospatial information systems, can solve problems such as weak simplification ability, loss of smooth group information in the model, and unfavorable visualization of virtual scenes, so as to improve the degree of automation and efficiency, ensure visual continuity, The effect of high execution efficiency

Inactive Publication Date: 2010-02-24
NANJING BAOYAN AUTOMATION
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Problems solved by technology

However, the tool's significant simplification capabilities are weak; simplification results often have errors such as broken faces, reversed face normals, and odd shapes
In addition, the model simplified by this tool often loses smoothing group information, which is not good for virtual scene visualization

Method used

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  • Multi-resolution modeling method for three dimensional model of complex building
  • Multi-resolution modeling method for three dimensional model of complex building
  • Multi-resolution modeling method for three dimensional model of complex building

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Embodiment Construction

[0058] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0059] see figure 1 , the principle of the technical solution of the present invention is to simplify the three-dimensional model M of the original building 0 , the original rendered image I is obtained through the mapping process of object space and image space 0 ; Then carry out the process of image space processing, from the original rendered image I 0 Get Perceptually Reconstructed Image I 1 , the original rendered image I 0 and perceptual image I 1 Find the difference to obtain the difference image I 2 ;Final difference image I 2 Inversely map to the object space, output the simplified model data, and visualize the 3D simplified model M of complex buildings 1 , to complete the object space simplification process.

[0060] The implementation process of the embodiment of the present invention uses a computer to realize automatic processing, i...

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Abstract

The invention relates to a multi-resolution modeling method for three dimensional model of complex building, comprising the steps of: building corresponding semi-side data structure with meaning information in a memory at same time of opening the three dimensional model of the building; calculating viewpoint spherical surface when the building three dimensional model is maximized to screen space by testing minimum bounding ball of the dimensional model of the building; acquiring viewpoint sampling position, and rendering the dimensional model of the building to obtain initial rendering image;executing HVS filter based on two dimension wavelet decomposition to the initial rendering image, and acquiring sensed image through wavelet coefficient reconstruction; calculating difference image according to the initial rendering image and the sensed image, dividing the pixels with changed gray scale in the difference image to obtain sensing information; finding out triangles corresponding to pixels with the changed gray scale on surface of the dimensional model of the building, simultaneously transmitting the corresponding sensing information to the triangles; simplifying the model according to the sensing information of the triangles.

Description

technical field [0001] The invention belongs to the technical field of geographic space information systems, in particular to a multi-resolution modeling method for three-dimensional models of complex buildings. Background technique [0002] With the rapid development of various measurement technologies, the accuracy of data acquisition has been rapidly improved, especially the wide application of laser scanning technology or CAD technology, making it easier to obtain high-precision building models, which are often Contains a more complex internal structure and highly detailed appearance, therefore, the complex building model mainly refers to the use of laser scanning or CAD technology to obtain and create a highly detailed appearance and complex internal structure, the model has a highly complex internal structure 3D building models with topological relationships and complex semantic relationships between components. A complex building model is characterized by a number of...

Claims

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Application Information

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IPC IPC(8): G06T17/20G06T15/00G06T15/20
Inventor 杜志强朱庆
Owner NANJING BAOYAN AUTOMATION
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