3D model retrieval method and 3D model retrieval apparatus based on slow increment features
A slow-increment feature and 3D technology, applied in character and pattern recognition, special data processing applications, instruments, etc., can solve problems such as sudden changes in feature forms, achieve the effects of reducing difficulty, efficient and accurate retrieval results, and improving matching efficiency
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[0048] Example 1
[0049] In order to make model retrieval more accurate, it can improve the efficiency of model retrieval and reduce the influence of external factors on the visual characteristics of the view, see figure 1 , This method includes the following steps:
[0050] 101: Use supervised incremental slow feature analysis method [6] , Perform incremental slow feature extraction on the preprocessed view set;
[0051] 102: Obtain the sorting of the incremental slow features according to the extracted incremental slow features, filter the incremental slow features according to the sorting results, and generate a 3D model incremental slow feature library;
[0052] 103: Use the nearest neighbor algorithm to search and match the incremental slow feature library of the 3D model, and obtain and output objects similar to the candidate model.
[0053] Wherein, the method further includes: obtaining the 2D view set V of the objects in the database, and preprocessing the 2D view set to make ...
Example Embodiment
[0063] Example 2
[0064] The solution in Embodiment 1 will be described in detail below in conjunction with specific calculation formulas and examples, as detailed below:
[0065] 201: Obtain a 2D view set V of objects in the database;
[0066] This method mainly applies retrieval technology based on image comparison, that is, 3D models are collected from multiple perspectives to form 2D view sets, and mature 2D technologies are used to extract features of objects. Therefore, each 3D model is represented by multiple views, so the view set can be expressed as Where v i Represents the view set of the i-th object; D represents the feature dimension of the view; f k Represents the k-th perspective of an object; N represents the number of 3D models; M represents the number of views of each 3D model; Indicates the scope of each object's view collection.
[0067] 202: Perform standardized preprocessing on the view set to make the view sizes of all 3D models consistent;
[0068] In order to...
Example Embodiment
[0113] Example 3
[0114] In this experiment, the embodiment of the present invention uses the existing, shared online, and more commonly used Zurich Federal Institute of Technology (German name Experiments were performed on the Technische Hochschule Zürich (ETH) database and the Taiwan University of China (NTU) database. The ETH database is relatively small and the model is more standardized. It includes 80 3D models, a total of 8 categories and 10 objects in each category, which are apples and cars. , Cow, cup, puppy, horse, pear, tomato. The NTU database has a total of 549 objects, 47 categories, and the number of objects in each category varies. The database is a virtual model database. Images are captured through 3D-MAX. This laboratory uses 60 virtual cameras to acquire images from different perspectives. , Each object obtains 60 different perspective views, where the number of virtual cameras, that is, the shooting angle, can be set according to experimental requirements,...
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