Constraint curved surface multi-resolution control preprocessing method

A multi-resolution and pre-processing technology, applied in the field of image processing, can solve problems such as non-conformity of the sub-resolution of the constrained surface, inconsistent resolution, etc., and achieve the effect of simplifying the detection method and the number of judgments

Active Publication Date: 2019-10-15
中国自然资源航空物探遥感中心 +1
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Problems solved by technology

[0006](2) The resolution of the constrained surface does not meet the requir

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  • Constraint curved surface multi-resolution control preprocessing method
  • Constraint curved surface multi-resolution control preprocessing method
  • Constraint curved surface multi-resolution control preprocessing method

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Embodiment 1

[0080] Embodiment 1. Approximation degree control of constrained curved surface

[0081] A discrete constructed model is an ideal piecewise approximation to a continuous object, and the discrete model is more accurate than all approximate continuous objects. The precision of a discrete surface is determined by the precision of points and the density of points. In practice, the construction model should have a minimum resolution to reflect the complexity of the desired geometry. However, the understanding of geometric complexity is related to the characteristics of the data. The resolution of the surface can be modified while maintaining the definition of the logical boundaries.

[0082] Therefore, the resolution of the model should be at least as follows: the mismatch between the model and the data is within the range of uncertainty of the data; Can also be higher. In many cases it is useful and appropriate to implement variable resolution or adaptive resolution on geologi...

Embodiment 2

[0096] Embodiment 2. Constrained surface multi-resolution control preprocessing method

[0097] For a structural model consisting of multiple sets of boundary surfaces and boundary lines, the classic strategy for remeshing is to remesh one by one.

[0098] The present invention adopts the strategy of regrid one by one, and first reconstructs linear geometric elements, that is, each boundary line and limiting condition (line), and then reconstructs surface geometric elements in curved surface space, that is, each constrained surface, no longer parameters into the plane. In the process of reconstructing geometric elements, its element size must be calculated, and meshing is performed on this basis.

[0099] 2.1. Grid size calculation method

[0100] In adaptive resolution meshing, the size of a single grid element is affected by many factors, the most important factor is the morphological characteristics of the area where the grid is located (such as the curvature of the surfa...

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Abstract

The invention provides a constraint curved surface multi-resolution control preprocessing method, which comprises the steps of grid size calculation, boundary line reconstruction, boundary surface reconstruction and boundary surface grid optimization. The method comprises the following steps: researching the approximation degree of a reconstructed boundary to the surface of a reservoir, controlling a reconstruction process by adopting an energy functional, and proposing a concise control function; calculating the grid size of each level of element according to the level progressive sequence ofthe angular points, the boundary lines and the constraint surfaces; and realizing reconstruction of a boundary line and a constraint surface according to grid size control. In-plane point distribution and triangulation are realized by adopting a model structure improved leading edge propulsion method. A Voronoi diagram protection area is adopted to realize processing of complex limiting conditions, and a surface triangular mesh optimization method is researched, and a Laplacian algorithm is improved, so that fairing of a spatial curved surface is realized. According to the method, the qualityof the constraint surface is improved, and the quality of the grid is further improved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a multi-resolution control preprocessing method for constrained curved surfaces. Background technique [0002] The quality of the grid directly affects the accuracy, numerical stability and correctness of practical applications such as finite element analysis and numerical simulation, while operations such as intersecting between grids during the modeling process cause the grid quality to gradually deteriorate , will affect the stability of the numerical value and the whole process of modeling. At the same time, due to the limitations of computer software and hardware, numerical calculations such as finite element analysis and reservoir numerical simulation have a relatively large limit on the number of calculation grids. Therefore, it is necessary to optimize the quality of tetrahedral meshes while controlling the quantity of tetrahedral meshes. [0003] In modeling w...

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Application Information

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IPC IPC(8): G06T17/20
CPCG06T17/20
Inventor 李兆亮熊盛青刘培刚刘钰洋
Owner 中国自然资源航空物探遥感中心
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