Three-dimensional (3D) human body modeling is an important research direction in the field of clothing virtual design. On the basis of 3D human body scanning, this paper studied a method to build a 3D parametric lower body model according to body classification. The research includes three main parts. (1) Anthropometry and body shape classification. We randomly selected 333 young women ages 18–25 years old in Northeast China as the experimental sample. Then we divided the lower body shape into three categories using principal component analysis and K-means clustering. (2) Determination of feature cross sections and points, and reconstruction of feature curves. According to the average values of each body type, we obtained the mean reference body by Euclidean distance method. We determined feature cross sections and points, and extracted the 3D coordinates of the feature points of the mean reference body to reconstruct the feature curves. (3) The surface lofting and establishment of parametric 3D lower body model. According to the shape characteristics of the lower body, we constructed the guiding lines for the crotch and lower limbs, and established parametric lower body models for three body types.

Relevance to industry

3D human modeling is an important part of garment industry digitization. This research provides an effective way to construct a parametric 3D lower body model. The method offers a reference for the parametric virtual human modeling and virtual fitting of trousers.

中文翻译：

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基于形状分类的年轻女性下半身的参数化3D建模

三维（3D）人体建模是服装虚拟设计领域的重要研究方向。在3D人体扫描的基础上，研究了一种根据人体分类建立3D参数化下半身模型的方法。研究包括三个主要部分。（1）人体测量学和身体形态分类。我们随机选择了东北地区的333名年龄在18-25岁之间的年轻女性作为实验样本。然后，我们使用主成分分析和K-均值聚类将下半身形状分为三类。（2）确定特征截面和点，并重建特征曲线。根据每种体型的平均值，我们通过欧氏距离法获得了平均参考体。我们确定了特征截面和点，提取平均参考物体特征点的3D坐标，重构特征曲线。（3）表面放样并建立参数化3D下半身模型。根据下半身的形状特征，构建了the部和下肢的引导线，并建立了针对三种体型的参数化下半身模型。

与产业的关系

3D人体建模是服装行业数字化的重要组成部分。该研究为构建参数化3D下半身模型提供了有效的方法。该方法为裤子的参数化虚拟人体建模和虚拟拟合提供参考。