A method to improve the accuracy of facial scan image registration dentition scan image

Abstract

A method for improving the accuracy of facial scan image registration dentition scan images, comprising the following steps: determining the chromaticity value range of a patient's lip color obtained by a facial scan device; adding an easy-color layer to the patient's dentition; The patient performs a face scan to obtain a face scan image; deletes the dentition image in the face scan to obtain a facial soft tissue image; obtains the patient's oral scan image; uses the calibration image of the positional relationship between the dentition and the lip line The dentition image is registered with the facial image; the minimum difference between the chromaticity value of the easy-color layer and the patient's lip color in the facial scanning image is greater than the chromaticity recognition accuracy of the facial scanning device. During the face scanning process, the lip image in the face scan image can be clearly displayed without the interference of the intraoral image, thereby eliminating the dead zone of light caused by the lack of accuracy of the face scanning equipment, thus ensuring the lip line in the face scan image structural integrity.

Description

technical field [0001] The invention relates to the technical field of denture design, in particular to a method for improving the accuracy of facial scan images for registration of dentition scan images. Background technique [0002] Before the restoration of the denture, the doctor needs to design the structure of the dentition according to the characteristics of the patient's face and mouth, so that the denture can perfectly fit the patient's face and mouth after the restoration is completed. [0003] The steps of dentition design generally include: obtaining the patient's facial feature data and oral scan data, deleting the dentition data in the facial feature data, and then registering the dentition data in the oral scan data with the facial feature data, and then It is convenient to design the specific structure and position of the denture. In the prior art, facial feature data of the patient is mostly obtained by facial scanning. During the facial scanning process, t...

AI Technical Summary

Problems solved by technology

However, due to the slightly open mouth, the connection between the dentition and the lip line forms a dead zone of light. Most facial scanners cannot obtain complete image data of the dentition between the lips when scanning the face.

Therefore, if figure 1 As shown, in the internal data processing and transmission process of the face scanning instrument, the image data corresponding to the dead zone of the light will be automatically completed to form a blurred image area, as shown in figure 2 As shown, when the dentition data in the face scan image data is deleted, the lip line structure in the face scan image data is destroyed. During the registration process, as image 3 As shown, the incomplete lip line structure will affect the position and structure design of the dentition

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