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Calibration method of virtual three-dimensional face reconstruction system

A calibration method, 3D human technology, applied in the field of orthodontics, to achieve the effect of reducing the cost of use, high clinical application value, and short calibration time

Pending Publication Date: 2021-03-12
深圳市深图医学影像设备有限公司
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  • Application Information

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Problems solved by technology

It solves the problem in the prior art that a binocular vision scanner is required to reconstruct a 3D face

Method used

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  • Calibration method of virtual three-dimensional face reconstruction system
  • Calibration method of virtual three-dimensional face reconstruction system
  • Calibration method of virtual three-dimensional face reconstruction system

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Experimental program
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Embodiment approach

[0060] As a preferred embodiment of the present invention, the step S1 specifically includes:

[0061] S11. Use the model coordinate system of the cylindrical phantom as the world coordinate system S w (x w ,y w ,z w ), and extract the coordinate value p of the cross mark point on the cylindrical phantom in the world coordinate system w ;

[0062] S12. When designing the cylindrical phantom, the cross mark points are arranged in groups, and the distance is fixed. According to the distance relationship, the coordinate values ​​in the two coordinate systems are arranged in order to ensure that the mark points correspond to each other. Therefore , use CBCT to scan and reconstruct the cylindrical phantom, construct a virtual three-dimensional model, and name it CT three-dimensional space, and construct a CT three-dimensional coordinate system S according to its origin o (x o ,y o ,z o );

[0063] S13. The coordinate value p of the cross mark point on the cylindrical phant...

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Abstract

The invention discloses a calibration method for a virtual three-dimensional face reconstruction system, and the method comprises the steps: S1, solving a transformation relation between a world coordinate system and a CT three-dimensional coordinate system through employing a model coordinate system of a cylindrical die as the world coordinate system; S2, solving internal parameters of the monocular camera by using a checkerboard calibration board to obtain a transformation relationship between a camera coordinate system and a camera image coordinate system; s3, shooting a phantom at an initial point through a monocular camera, and solving a transformation relation between a world coordinate system and a camera image coordinate system; S4, according to the known coordinate transformationrelationship, finally obtaining the transformation relationship from the CT three-dimensional coordinate system to the camera image coordinate system; and S5, since the monocular camera is fixed on the CBCT, when the cantilever rotates, solving the coordinate transformation relation at any position. The method is used for realizing system calibration of the monocular camera and the CBCT, hardwareand data bases are laid for three-dimensional face reconstruction, and the problem that a binocular vision scanner is required to reconstruct a three-dimensional face in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of orthodontics, in particular to a calibration method for a virtual three-dimensional human face reconstruction system. Background technique [0002] With the improvement of people's living standards, people pay more and more attention to their own appearance. A good appearance image can be obtained through trimming, correction, and whitening of facial features. Currently, surgical planning is required before any type of plastic surgery. By taking CT images, doctors can diagnose patients and formulate surgical plans. Combined with 3D reconstruction of CT images, doctors and patients can understand the purpose of surgery and correction plan, and combine preoperative and postoperative image information to intuitively Compare the effect of surgery. However, the current 3D reconstruction effect for CT is not realistic enough. At the same time, because the CT image contains a lot of information about other ana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80G06T7/40G06T17/00G06K9/00G06F17/16G06T3/60
CPCG06T7/85G06T7/40G06T17/00G06F17/16G06T3/60G06V40/161
Inventor 饶玉明戴知宇蔡丽晶杨荣骞
Owner 深圳市深图医学影像设备有限公司
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