Method for conducting upright correction on three-dimensional lie-down craniofacial models based on geodesic lines

Abstract

The invention discloses a method for conducting upright correction on three-dimensional lie-down craniofacial models based on geodesic lines. The method includes the steps that first, for each craniofacial model, the uniform angle geodesic line in the model is extracted from a nasal tip point, each geodesic line is evenly divided according to the geodesic distance from the nasal tip point to the other end of the geodesic line, and the equal division points on the geodesic lines are used as features points of the corresponding three-dimensional craniofacial model; then, the motion vector from the feature point on each three-dimensional lie-down model to the corresponding feature point on an upright model in sample space is calculated, statistic models are established for the feature points and the motion vectors of the feature points, and the model change rules under the two different postures are counted. The motion vectors of the feature points of the lie-down craniofacial models to be corrected are determined according to the statistic models, and the deformation from the lie-down craniofacial models to the upright craniofacial models is determined according to the motion of the feature points. By the adoption of the method, the three-dimensional lie-down craniofacial models can be accurately corrected into the upright models, and great application value is achieved in the fields of forensic anthropology, occlusalf surface shaping and the like.

Description

technical field [0001] The invention relates to a method for correcting a lying three-dimensional craniofacial model upright, in particular to a method for correcting from a lying three-dimensional craniofacial model to an upright three-dimensional craniofacial model based on geodesic geometry. It is mainly used in criminal investigation, maxillofacial surgery, forensic anthropology and other fields. Background technique [0002] The human face is the most important part of the discrimination of human individual differences. The measurement of human facial soft tissue thickness, craniofacial morphology analysis, skull-based facial reconstruction and other craniofacial morphology research are the basic contents of forensic anthropology. With the development of computer science and data acquisition technologies such as computed tomography (CT) and magnetic resonance imaging (MRT), we can obtain craniofacial data of different people and age groups, so that we can use Scientifi...

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