Face-flexible-body virtual evaluation method fusing shape characteristic and topology characteristic

Abstract

A face-flexible-body virtual evaluation method fusing a shape characteristic and a topology characteristic belongs to the measured data modeling field. The method comprises the following steps of 1) constructing a face-flexible-body model; 2) representing a face-flexible-body model geometrical characteristic based on a shape histogram method; 3) based on an overlapping projection method, extracting a topology characteristic of the model; and 4) fusing face-flexible-body virtual evaluation of the shape histogram method and the overlapping projection method. In the invention, the shape histogram method of extracting the face-flexible-body model geometrical characteristic and the overlapping projection method of extracting the topology characteristic are fused so that accuracy of the face-flexible-body virtual evaluation is increased.

Description

Technical field [0001] The invention relates to a virtual evaluation method for a facial flexible body, in particular to a virtual evaluation method for a facial flexible body based on an improved shape histogram method, and belongs to the field of measurement data modeling. Background technique [0002] The virtual evaluation of the modeling effect of the facial flexible body is a relatively difficult topic. At present, in the clinical practice in hospitals, it depends more on the personal experience of the doctor and can only give a relatively vague estimate. [0003] In addition, the face is considered as a rigid body. In 2013, the team of Dr. Sun Jin of Yangzhou University adopted a three-dimensional model based on several fixed feature bone points in the "Imperfectsymmetry transform for orbital prosthesis modelling" (Rapid PrototypingJournal 2013 02). The symmetry of the modeling effect is evaluated in the three-dimensional coordinate system, and the normal distance between th...

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Problems solved by technology

[0002] The virtual evaluation of the modeling effect of the facial flexible body is a relatively difficult subject. Currently, in the actual clinical application of the hospital, it relies more on the personal experience of the doctor, and can only give a relatively vague estimate.

[0003] In addition, the face is considered as a rigid body. In 2013, the team of Dr. Sun Jin of Yangzhou University adopted a three-dimensional model based on several fixed feature bone points in "Imperfectsymmetry transform for orbital prosthesis modeling" (Rapid PrototypingJournal2013 Issue 02). The symmetry of the modeling effect is evaluated in the three-dimensional coordinate system, and the normal distance measurement between the edge area of ​​the incomplete reconstruction feature and the adjacent data is used to check the degree of fit between the incomplete reconstruction feature and the adjacent data; The reconstructed feature and the adjacent data are cross-sectioned to obtain the cross-section line, and the curvature of the curve of the cross-section line is analyzed to check the smoothness of the prosthesis and the surrounding tissue. Since the characteristics of the facial flexible body are not considered, there is a gap in the evaluation. defect

[0004] Because the facial flexible body is difficult to characterize, it is often realized as a rigid body in the geometric modeling of the facial flexible body in the past. In addition, the prediction of surgical results can only give a relatively vague estimate, and there is a lack of effective quantitative prediction methods.

This is the fundamental reason why facial prostheses often appear dull

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