Characteristic reservation based three-dimensional model progressive transmission method

A technology of 3D model and transmission method, which is applied in the direction of pulse modulation TV signal transmission, 3D modeling, image data processing, etc. It can solve the problems of long waiting time for users and does not support 3D scenes, etc., and achieve the goal of wide application range and practicability Effect

Inactive Publication Date: 2008-02-06
BEIHANG UNIV
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  • Claims
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Problems solved by technology

The disadvantage of this method is that the user wait time is too long
[0004] For the progressive grid method, there have been many methods to improve it. However, most

Method used

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  • Characteristic reservation based three-dimensional model progressive transmission method
  • Characteristic reservation based three-dimensional model progressive transmission method
  • Characteristic reservation based three-dimensional model progressive transmission method

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Embodiment Construction

[0048] The present invention includes three aspects: model simplification, compression coding, and progressive transmission, and the realization process is shown in FIG. 1 .

[0049] 1. Simplification of 3D model

[0050] The invention adopts the triangle folding algorithm based on the secondary error to simplify the three-dimensional model, and preserves the topological boundary and attribute characteristics of the model while simplifying. The basic operation of the algorithm is the folding and shrinking of the triangle, that is, through the triangle T i Perform a folding operation so that its three vertices are merged into one vertex v i , thus simplifying the original grid.

[0051] The algorithm first classifies all triangles in the original mesh, and the division principles are as follows:

[0052] For each triangle in the mesh model, if one of its edges is only owned by one triangle (that is, the triangle), then the edge is a boundary edge, and the triangle is a bound...

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Abstract

The present invention relates to a three-dimensional model progression transmission method on basis of keeping character, the present invention holds the improvement for character keeping on the basis of the simplified arithmetic of the original three-dimensional model, and at the same time of simplifying the geometrical model, the present invention keeps the topological property and attribute character of the model, and gets the underlying net with smaller data amount, and on the basis of above, the processing coding is held distributed on basis of octree to construct the procession net document. When in transmission, the octree broadness prior coding underlying net is firstly used, and then adopting the procession net transmission method to transport a serial detail recovering information, and continuousely improving model presicion and recovering the original document, thereby solving the problem that: the responding time for the traditional transmission method is long. In adition, the viewpoint related transmission strategy facing the object is designed for the three-dimensional scene, increasing the actural drawing, and making the visibility judging of the object is carried out by putting on the clinet end, and reducing the loading of the server.

Description

technical field [0001] The present invention relates to the technical field of 3D model simplification, geometric compression coding, and progressive transmission, especially a feature-preserving 3D model progressive transmission method, which can be applied to the processing of various 3D models with complex texture and structural features and web publishing. In addition, it is also applied to the network publishing of precious cultural relics in digital museums. Background technique [0002] In computer graphics, triangular meshes are generally used to describe complex three-dimensional shapes. With the continuous improvement of 3D data capture technology, the amount of grid data will be very large, which brings many difficulties to the storage, transmission and rendering of 3D models. The digital museum contains a large number of 3D models that need to be displayed online. The most basic ones, such as the transmission of a single model exhibit, and the complex ones, suc...

Claims

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Application Information

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IPC IPC(8): H04N7/24G06T17/00
Inventor 沈旭昆齐越赵沁平赵学伟
Owner BEIHANG UNIV
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