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[硕士论文]三维虚拟试衣系统中参数化人体建模技术的研究.PDF

在标准三维人体模型的基础上,用户只要输入自己的特征尺寸(胸围、腰围、臀围等)就可以得到自身模型。该系统具有使用方便、建模迅速等特点,并且用户可旋转多角度查看。而且该系统根据人体数据生成了相应骨架,人体能在骨架驱动下进行简单的动作。总之,该系统为后期的动态展示服装打下了良好的基础。
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华中科技大学
硕士学位论文
三维虚拟试衣系统中参数化人体建模技术的研究
姓名:崔树芹
申请学位级别:硕士
专业:计算机系统结构
指导教师:余胜生
20060510

I
摘 要
三维人体模型的建模方法是三维虚拟试衣系统中的关键技术,人体的建模方法
直接影响后期三维服装模拟实现的难易程度和表现效果,并且现在服装
CAD(Computer Aided Design)发展的趋势也是三维的,因此研究三维服装人体模型
的建模方法具有广泛的研究价值和应用前景。本文对参数化三维人体建模技术进行
研究,主要研究内容如下。
分析了当前三维人体数据的获取方法。根据三维虚拟试衣系统本身的特点,以
及目前系统实施的可行性,提出采用服装行业传统的接触式测量方法和标准人体模
板库相结合的方法来实现个性化三维人体建模。为了保证人体模型的精确性,用户
除了提供胸围、腰围、臀围、身高等一般数据外,还可以增加测量人体附加特征尺
寸,例如胸部宽度、胸部厚度、乳间距、乳高、臀厚等特征尺寸,这样就使系统重
建的三维人体模型更加生动、逼真。
构建人体库前必须得获取人体三维数据。由于条件的限制,本文利用专业的三
维人体造型软件 Poser 6.0 自带的人体模型,将其导出为 3DS 文件,再利用计算机
程序读取 3DS 文件提取有用的人体表面顶点信息。本文对 3DS 文件的相关格式也
作了简单的介绍。
三维人体的建模方法很多,具体来说有线框建模、曲面建模、实体建模和基于
物理的建模等。本文根据三维虚拟试衣系统要求人体尺寸精确、人体模型形象逼真、
容易修改等特点,采用在 VC++开发环境和 OpenGL 三维图形软件包下利用小三角
面片逼近人体表面来重构人体模型。因为从造型软件导入的人体数据,数据点多且
分布散乱,这样不利于后期人体模型根据特征尺寸变形以及服装的试穿,会增加运
算量和复杂度。具体做法是首先根据人体的生理形态特征,将人体分成了很多部件,
然后根据曲率变化,进行数据点的采样,曲率大的地方,采样点多一些,曲率小的,
采样点少,并把采样点按照分部件、分层存储起来。人体建模时采用轮廓同步前进
法绘制三角片,从而得到比较光滑的人体曲面。

II
在标准三维人体模型的基础上,用户只要输入自己的特征尺寸(胸围、腰围、
臀围等)就可以得到自身模型。该系统具有使用方便、建模迅速等特点,并且用户
可旋转多角度查看。而且该系统根据人体数据生成了相应骨架,人体能在骨架驱动
下进行简单的动作。总之,该系统为后期的动态展示服装打下了良好的基础。
关键词:三维虚拟人体,三角片建模,数据采样,基于参数变形,特征点,
光照模型

III
Abstract
The method of 3D human body modeling is critical to the 3D virtual try on system,
and it will influence the complexity and effect of garment’s simulation directly. Also now
garment computer aided design system is shifting from two-dimension design to three-
dimension design. Therefore studying the method 3D human body has extensive value in
research and prospect for application. In this thesis, the method of parameterized 3D
human body modeling is developed. The following matter is involved.
First, current obtaining 3D human body surface information is discussed。 According
to the traits and the feasibility of 3D virtual try on system, the method of combining the
traditional method of osculating measurement in costume industry with standard human
body template library is put forward. In order to obtain a accurate virtual body , In except
the basic parameter is provided by the client ,such as chest girth, waist girth, hip girth,
stature and etc,also additional characteristic size parameter need be provided, such as the
thickness and width of the chest, the distance of the breast, the height of the breast, the
thickness of the hip. Then the reconstructed 3D virtual human body can be more vivid and
realistic.
The surface information of 3D human body must be obtained before constructing the
library of virtual human body. Because of the experiment conditions, the human body
model is constructed by the professional 3D character design software Poser 6.0, the data
of human model is exported in 3DS file format, then according to the structure of 3ds file
type, we work out a program to acquire the surface vertex information of mannequin. The
format of 3DS file also is introduced simply.
There were many methods for 3D human body modeling purpose, such as Line
framing, curved surface, solid and physical-based modeling methods, In the thesis,
because accurate geometric surface, vivid appearance and easily modified virtual human

IV
body is characteristic of the 3D virtual try on system, we use triangular face to reconstruct
body surface in the development environment of VC 6.0 and OpenGL 3D graphics
modeling library. The surface information of body is huge, which is exported from 3D
software, and data point is scattered in the tree dimensional space, therefore, it is adverse
to the deformation of mannequin and virtual try on system, also increase the computing
time and complexity to get the result. So first the human body is divided into many parts
based on physiologic traits, second according to the change of curvature, the useful data
point is sampled, the curvature vary more quickly, the data point is sampled more, and
save the sampled data point according to both body part and hierarchy. When
reconstructing human body, triangular face’s order is organized by the method of contour
synchronous forwarding, so the smooth surface human body is reconstructed.
After reconstructing a standard female mannequin, so long as users input self
characteristic size parameters in this system, such as chest girth, waist girth, hip girth and
so on, a individualized human body model is viewed. The developed system is convenient
for modeling, by which human model is constructed accurately and quickly, users can
rotate the virtual model and view it. Based on the information of human body, the
corresponding skeleton is created, the mannequin can animated simply under skeleton
driven. Therefore, good foundation is settled for developing dynamic dressing clothes
later.
Keywords:3D human body, Triangular modeling, Data sampling,
Modification by size parameters, Characteristic points, Lighting model
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