Method for extracting characteristics of three-dimensional model based on section ray

A 3D model and feature extraction technology, applied in 3D modeling, image data processing, instruments, etc., can solve the problems of difficult widespread promotion, complicated operation, and high cost

Inactive Publication Date: 2010-12-01
BEIHANG UNIV
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Problems solved by technology

This method is complex and costly
[0005] From these existing methods, it can be generally seen that the simple and easy-to-use feature extraction methods cannot accurately describe the characteristics of the model, and have strict requirements on the model, which is not easy to be widely promoted; the feature extraction methods with high-quality retrieval effects are complex in calculation and difficult to implement

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  • Method for extracting characteristics of three-dimensional model based on section ray
  • Method for extracting characteristics of three-dimensional model based on section ray
  • Method for extracting characteristics of three-dimensional model based on section ray

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Embodiment Construction

[0070] The inventive method is based on the tangent ray algorithm. The core of the algorithm is to transform the model into a standardized and unified coordinate frame, use the set of distances from specific points on the main axis section to the model surface as the feature representation of the model, and then compare them according to the established evaluation criteria. The implementation method is divided into two parts, which are feature extraction and feature matching. Specific steps are as follows:

[0071] In step 1, the set of distances from a specific point on the main axis section of the model to the model surface is used as the feature description of the model, and feature extraction is performed on the model.

[0072] The 3D model M can be represented by a set T of triangle faces. with vertex P i represents the vertex P(x i ,y i ,z i ), then the vertex set can be expressed as P={P 1 , P 2 ,...P 3}. Let the triangle vertex index table be:

[0073] ...

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Abstract

The invention relates to a method for extracting characteristics of a three-dimensional model based on a section ray, which aims at the problems of a high calculation complexity, a larger distortion, not having a common research method and being difficult to obtain higher research precision in the existing method for extracting the characteristics of a mode based on contents. The method takes distance sets from specific points on a principal axis section of the model to the model surface as a characteristic description of the model, thus a problem of the model matching is transformed into the problem of comparing a group of distance sets. The method is divided into two sections of characteristic extraction and characteristic matching; when extracting the characteristics, the method can simply and rapidly obtain the model characteristics which have small reconfiguration distortion and can correctly describe a stereochemical structure and structural characteristics of the three-dimensional model. The method has the advantages of simplification, wide applicability, good research quality and high efficiency, therefore, the method has higher practical applicability and wider application range.

Description

technical field [0001] The present invention relates to a content-based three-dimensional model feature extraction method, which is a new three-dimensional model feature extraction method based on section rays. A collection of methods for 3D model retrieval. Background technique [0002] With the rapid development of computer hardware and software, as well as the promotion of multimedia technology and virtual reality technology, 3D models have received more and more attention and research. A 3D model is a 3D polygonal representation of an object, which can be displayed by a computer or other video-screen devices. 3D models can represent objects more realistically than 2D models. Therefore, 3D models play an important role in many fields such as biomedicine, e-commerce, virtual reality, architectural design, mechanical design, and 3D games. [0003] So far, a large number of 3D models have appeared on the Internet, and the application requirements of 3D models are also incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00
Inventor 冷彪曾加贝符翔伟熊璋
Owner BEIHANG UNIV
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