由正交图像造型三维个性化虚拟人体模型
Personal Virtual Human Modeling from Images
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摘要: 基于正、侧、背面4幅正交人体图像,变形模板人体模型后得到带服饰纹理的个性化虚拟人.以截面环为基本几何元素,给出了模板人体模型的生成和变形方法,建立了截面环和三维人体骨架之间的内在关联;自动提取图像上的人体特征点,生成二维图像上的人体骨架;由三维人体骨架和二维图像上人体骨架之间的对应关系,建立截面环和人体图像之间的对应关系;从人体图像上获取截面环的形状参数,通过参数化变形截面环得到个性化的虚拟人体模型.与已有方法相比,该方法建立在基于特征的参数化框架之上,变形更容易控制,消除了三维模型和二维图像之间对应的不确定性,避免了人体变形中的自交现象,效率高、真实感效果较好.Abstract: A new technique is presented for modeling personal virtual clothed human model with images in orthogonal views.The modeling process is template-based.Firstly,a method for constructing a cross-section based template human model from a scanning human model is proposed.A method for describing the intrinsic relationship between cross-sections and the 3D skeleton of template human model is proposed.Secondly,2D skeletons of a human in images are set up after automatically extracting feature points on human contours.Thirdly,the relationship between the cross-sections and images is established with the correspondence between 3D skeleton of the template human model and 2D skeletons on images.Finally,a personal virtual human model is obtained by parametrically deforming cross-sections with shape parameters that is automatically gotten from images.Comparing with other methods,our approach is feature and parameterization based,which makes human model deformation more convenient and efficient;the mapping uncertainty between vertices on 3D human model and 2D images is removed;and self-intersection during human model deformation is also avoided.
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