3D tooth imaging modeling method

Abstract

The invention provides a 3D tooth imaging modeling method. The method comprises the steps: obtaining a tooth image of an oral cavity through a binocular camera; carrying out the denoising filtering of the tooth image; calibrating the binocular camera, and obtaining a reprojection matrix; calculating three-dimensional coordinates of the tooth image through the reprojection matrix and the tooth image after noise reduction, and obtaining the point cloud data; and carrying out the curved surface reconstruction of the point cloud data through a space Poisson equation. Compared with a conventional method, the method can quickly obtain a tooth model, is low in cost, does not need to employ a conventional die obtaining material, reduces the waste, and can improve the treatment experience of a patient.

Description

technical field [0001] The invention relates to the technical field of modeling, in particular to a 3D dental imaging modeling method. Background technique [0002] In the field of medical imaging, real-time three-dimensional tooth modeling has gradually become a research hotspot due to the long time-consuming and high single-time cost of traditional oral tooth modeling methods. It is mainly divided into image acquisition, binocular camera stereo calibration, feature point extraction, stereo matching and other stages. However, for real-time reconstruction of intraoral images, a combination of miniaturized sensors and better algorithms is required to obtain an ideal 3D model. [0003] The existing 3D reconstruction methods mainly include: [0004] (1) Using lidar and ultrasonic to directly obtain surface depth information to realize 3D reconstruction. The advantage of this method is that the algorithm design is relatively easy and the accuracy is high, but the volume is lar...

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Problems solved by technology

[0004] (1) Use laser radar and ultrasonic to directly obtain surface depth information to realize 3D reconstruction. The advantage of this method is that the algorithm design is relatively easy and the accuracy is high, but the volume is large and cannot be well applied in the field of oral cavity modeling.

[0005] (2) Use 3D modeling software to build a 3D model of an object, such as Solidworks, CAD, etc. This method has obvious advantages. The operator does not need to have too much professional knowledge, and only needs to be familiar with the use and operation of the software, which reduces the threshold for use , which improves the ease of use, but for the field of intelligent robots, it is impossible to reconstruct the environment manually, so this method has certain limitations

[0009] (1) Lidar is large in size and difficult to control in cost, and only traditional methods can be used in the field of oral cavity modeling, which is not applicable to the method proposed in this patent

[0010] (2) Use 3D modeling software to perform 3D modeling of teeth. Due to the need to obtain accurate size information in the early stage, the actual operation is basically not feasible

[0011] (3) Although the blue light photography method can obtain a high-precision tooth model, it needs to be sprayed with powder before use, and the operation is more complicated

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