Method, device, and terminal equipment for partial retrieval of 3D models based on sketches

Abstract

The present invention provides a sketch-based local retrieval method, device, and terminal device for a three-dimensional model. The method includes: inputting a two-dimensional sketch; projecting the three-dimensional model to obtain two-dimensional views at different angles; extracting the outer contour of the two-dimensional view; Sampling is performed on the outer contour, and the key points of the outer contour are obtained through an adaptive corner detection algorithm during sampling; the points obtained by sampling are clustered according to the distance between the points, and the clustering divides the outer contour into K parts, K >1; calculate the angle feature for each part after division, and obtain an N×N-dimensional angle matrix; also calculate the corresponding angle matrix for the two-dimensional sketch; combine the angle matrix of the three-dimensional model and the angle matrix of the sketch into the convolutional neural network The network CNN is trained; after training, a one-dimensional vector is obtained, and the similarity score is calculated according to the one-dimensional vector. The similarity score represents the similarity score between the 3D model and the sketch; the top W 3D models with the highest similarity scores are output and presented to the user to complete the model retrieval , where W>1. The invention can enable the user to find the desired model conveniently and intuitively.

Description

technical field [0001] The present application relates to the field of search technology, and in particular to a method, device, and terminal device for local retrieval of 3D models based on sketches. Background technique [0002] The current sketch-based 3D model retrieval technology does not fully consider the sparse and arbitrary characteristics of pixel values ​​in the sketch, and can only retrieve models that are similar to the sketch as a whole, and it is difficult for models that are partially similar to the sketch but not in other parts retrieved. Contents of the invention [0003] In view of the above-mentioned defects or deficiencies in the prior art, a method, device, terminal device and storage medium for a partial retrieval of a 3D model based on a sketch are provided. According to the sketch drawn by the user, the 3D models that are similar overall or locally are retrieved, and the models with the highest similarity are output to the user, so that the user c...

AI Technical Summary

Problems solved by technology

[0002] The current sketch-based 3D model retrieval technology does not fully consider the sparse and arbitrary characteristics of pixel values ​​in the sketch, and can only retrieve models that are similar to the sketch as a whole, and it is difficult for models that are partially similar to the sketch but not in other parts retrieved

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