3D Body Deformation Technology Based On Elliptical Fourier Descriptors

3D body measurement technology is different from the traditional manual measurement, which provides rapid and efficient size basis for the virtual fitting, personalized custom clothing and other fields. In this paper, the basis of Fourier elliptic curve fitting human characteristic curve, combined with the 3D body measurement technology and 3D modeling of the human body achieved deformation of the 3D body between different human, providing the basis for virtual fitting clothing, clothing customization and other fields. This paper mainly involves research in the following areas:(1) 3D body scanningIn this study, the 3D body scanning is indoors body scanning, and the device is a multi-machine scanning device, which is developed by the project team. The advantage of this scanner is scanning a body with wide coverage, less lacking of status and less scanning time. A full body’s scanning time is about 11-12 s. The scanning objects of this study is 100 young women whose age are 18 to 25, the contour most women is symmetrical, and the structural characteristics of the body are significant.(2) Acquisition and processing of 3D body dataIn this study, 3D body data acquired by the multi-machine scanning device is processed in reverse engineering software, which involves the function of noise reduction, removing outliers and reducing data points to optimize the point cloud data, and then getting encapsulation of point cloud data to achieve a 3D model of the human body with filling holes and optimization process. The process can provide a model-based body for other works in this study.(3) Measurement of 3D body dataThe measurement software used in the work is developed by the project team, the software measure body automatically with the encapsulation model. The software can identify physical characteristics of body automatically, and calculate the size of 3D model after analysis.(4) Fourier elliptic fitting body characteristic curveBody characteristic contour curves are all smooth curves similar to oval, according to this feature of human characteristic contour curve, the study uses Fourier elliptic curve to fit the characteristic contour curves of 100 measured women. Based on a single fitted curve, this study builds Fourier elliptic fitting model of torso, segments the torso into 47 characteristic curves, providing model basis for human deformation.(5) Principal component analysis and error analysis of fitted curvesTo analyze principal component through the Elliptical Fourier Descriptors, which provides basis for the principal component of Fourier elliptic fitted model. Comparing fitted curves and body characteristic curves for error analysis, to determine the maximum harmonics number of Fourier elliptic fitting curve at 20.To segment the torso into 47, and establish torso model with principal component analysis, getting the variance contribution rate of principal component.(6) Body deformation based on Fourier elliptic fitted curveBased on the Fourier elliptic fitted curves and Fourier elliptic fitted model, the study builds relationships of multiple regression through expression of parameters. To achieve morphological characteristics of body through analyzing principal component. The study develops the body deformation software with Matlab R2014 b platform, achieving free deformation of different bodies which are included in the database, the basis is on the relationship of principal component and morphological characteristics.This study finally realized 3D body measurement, Fourier elliptic curve fitting human characteristic curve and principal component analysis, 3D body modeling based on Fourier fitted curves, and deformation between different 3D human body, providing basic conditions for the virtual fitting clothing and clothing customization.