Method for obtaining human dental arch curve based on binocular vision

A dental arch curve and binocular vision technology, applied in dentistry, medical science, etc., can solve the problems of short imaging time and low radiation dose, and achieve the effect of reducing manual intervention

Inactive Publication Date: 2020-12-04
常州飞诺医疗技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have bypassed the dental panoramic imaging device, and at the same time lost the advantage

Method used

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  • Method for obtaining human dental arch curve based on binocular vision
  • Method for obtaining human dental arch curve based on binocular vision
  • Method for obtaining human dental arch curve based on binocular vision

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0056] Embodiment one: if Figure 1-2 As shown, a method for obtaining human dental arch curve based on binocular vision is characterized in that:

[0057] Assuming that there is no measurement error, that is, ideally, the focal length of the left and right cameras is f=2, the baseline distance B=6, the length and width of the image in the image plane are both 10, and the intersection point of the optical axis and the image plane is at two The center position of the dimensional image, namely (u 0 ,v 0 )=(5,5), set the base point position P 0 The coordinates are (0, 0, 10), then according to the geometric relationship, the two-dimensional coordinates of the base point in the left image are (u left ,v left )=(5.6,5), the two-dimensional coordinates of the base point in the right image are (u right ,v right )=(4.4,5), the three-dimensional coordinates can be calculated by substituting into the formula, where the parallax D=u left -u right =1.2, v=(v left +v right ) / 2=5,...

Example Embodiment

[0066] Embodiment two:

[0067] In the case of errors, add noise to simulate measurement errors. Assuming that the measurement errors are random numbers uniformly distributed from -0.05 to 0.05 on x, y, and z, the coordinates of seven points can be generated as follows:

[0068] When i=-3, x=-1.9898, y=-0.0271, z=10.3943;

[0069] When i=-2, x=-1.3570, y=0.0413, z=10.1384;

[0070] When i=-1, x=-0.6513, y=-0.0348, z=10.0906;

[0071] When i=0, x=0.0189, y=0.0326, z=9.9505;

[0072] When i=1, x=0.6915, y=0.0038, z=10.0719;

[0073] When i=2, x=1.3284, y=0.0496, z=10.2095;

[0074] When i=3, x=1.9584, y=-0.0422, z=10.4369;

[0075] It can be calculated that a=0.1055.

[0076] Working principle: first calibrate the binocular stereo camera, including the calibration of internal parameters and external parameters. Before the dental panoramic scan, adjust the position of the human head, try to keep the dental arch curve of the human body on the horizontal plane. During the spe...

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Abstract

The invention discloses a method for obtaining a dental arch curve of a human body based on binocular vision, and belongs to the technical field of dental arch curve obtaining. The method comprises abinocular stereo camera and a laser point light source, wherein the binocular stereo camera comprises a left camera and a right camera. The method is scientific and reasonable and safe and convenientin use. In the implementation process, the binocular stereo camera is firstly calibrated, only the initial scanning position needs to be manually determined, after the dental arch curve is obtained, the most similar dental arch curve in the dental arch curve preset by a patient to be examined and the existing dental panoramic imaging device can be found out according to the dental arch curve, subjective judgment and manual selection of actual operators are not needed, and manual intervention is reduced as much as possible or at least one reference is provided; and the dental arch curve obtained by the method provides possibility for dynamically formulating a dental arch scanning track, and can be introduced into software and hardware design of dental panoramic equipment.

Description

technical field [0001] The invention relates to the technical field, in particular to a method for obtaining human dental arch curves based on binocular vision. Background technique [0002] The dental panoramic imaging device is a medical device that scans the virtual dental arch curve with X-ray beams and X-ray detectors to obtain multi-frame images, and combines position and orientation information to generate dental panoramic images; existing dental panoramic imaging devices will preset dental arch curves Scan and generate panoramic images. The patent published by Planmeca claims it can generate multiple tomographic layers and also construct and display images of dental arches or parts of them viewed from different directions. The US patent [US 20150139524Al] published by Vatech claims that its dental panoramic imaging device can automatically fuse multiple tomographic imaging layers to generate the clearest panoramic image. This makes the difference between the preset...

Claims

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Application Information

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IPC IPC(8): A61C19/04
CPCA61C19/04
Inventor 丁鹏徐小春张琦李庆梁银强
Owner 常州飞诺医疗技术有限公司
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