采用草绘轮廓的3维人脸建模方法

为方便用户进行3维人脸形状设计，提出一种基于手绘轮廓的3维人脸建模方法。该方法的主要特点在于,一方面，引用姿态估计技术对人脸草图进行解析，将用户绘制的侧视人脸草图转换成对应的正视人脸草图，可支持用户选择多个视角绘制人脸；另一方面，采用多层映射机制建立人脸草图特征点与3维人脸特征点之间的一一对应关系，由对应特征点之间的形变量来控制生成3维人脸，保证草图笔画的几何形状信息能有效映射到3维模型中。实验结果表明，文中方法能快速生成形状新颖的特定人脸，可有效支持用户进行3维人脸形状的手绘建模。

Method of 3D face modeling from freehand portrait sketch

To facilitate designers to design 3D face shapes conveniently, this paper presents a method of 3D face modeling using freehand portrait sketch. Our method has two characteristics: Firstly, pose estimation is introduced to face sketch analysis. It infers the corresponding front-view sketch from the side-view face sketch, users then can draw the free-form portrait sketch from their selected view. Secondly, multi-layer mapping is adopted to establish one-to-one correspondence between the sketch feature points and 3D face feature points, and the displacements between the corresponding feature points are calculated to generate the specified 3D face models. It guarantees that the geometrical characteristics of the strokes can be retained in the final 3D face model. The experiment results prove that the proposed method can generate novel 3D face models quickly and support the process of sketch-based face modeling efficiently.