Three-dimensional model retrieval method and apparatus

Abstract

The invention discloses a three-dimensional model retrieval method and apparatus and a three-dimensional model database construction method and device. The three-dimensional model retrieval method includes the steps of dividing a three-dimensional model to be retrieved into a plurality of sub-blocks; classifying the sub-blocks according to shape characteristics of the sub-blocks; separating the plurality of sub-blocks of the three-dimensional model to be retrieved into layers according to the size of every sub-block; extracting structural characteristics of every layer as multilayer structure characteristics of the three-dimensional model according to the connection relationship of every sub-block in every layer in the three-dimensional model; calculating the similarity of the three-dimensional model to be retrieved and every three-dimensional model in a three-dimensional model database according to the multilayer structure characteristics; outputting a retrieval result according to similarity calculation results.

Description

Technical field [0001] The present invention relates to the field of computer pattern recognition, and more specifically to the technology of three-dimensional model retrieval. Background technique [0002] With the development of computer technology and CAD (computer aided design) technology, more and more three-dimensional models have been designed. Three-dimensional model is the fourth type of multimedia data after audio, image and video. The increasingly developed Internet and computers with increasing performance provide conditions for people to share and process three-dimensional models. How to manage and reuse these 3D models becomes particularly important for customers, because it helps shorten product cycles and reduce design costs. [0003] The retrieval method of 3D model is similar to other multimedia data retrieval methods, mainly divided into text-based retrieval and content-based retrieval. The text-based retrieval method relies on manual annotation and has the dis...

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Problems solved by technology

[0004] However, the above-mentioned retrieval methods for 3D models generally have disadvantages such as slow retrieval speed and poor matching effect.

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