Lu Xiaoguang, Jain Anil
Siemens Corporate Research, East Princeton, NJ 08540, USA.
IEEE Trans Pattern Anal Mach Intell. 2008 Aug;30(8):1346-57. doi: 10.1109/TPAMI.2007.70784.
Face recognition based on 3D surface matching is promising for overcoming some of the limitations of current 2D image-based face recognition systems. The 3D shape is generally invariant to the pose and lighting changes, but not invariant to the non-rigid facial movement, such as expressions. Collecting and storing multiple templates to account for various expressions for each subject in a large database is not practical. We propose a facial surface modeling and matching scheme to match 2.5D facial scans in the presence of both non-rigid deformations and pose changes (multiview) to a 3D face template. A hierarchical geodesic-based resampling approach is applied to extract landmarks for modeling facial surface deformations. We are able to synthesize the deformation learned from a small group of subjects (control group) onto a 3D neutral model (not in the control group), resulting in a deformed template. A user-specific (3D) deformable model is built by combining the templates with synthesized deformations. The matching distance is computed by fitting this generative deformable model to a test scan. A fully automatic and prototypic 3D face matching system has been developed. Experimental results demonstrate that the proposed deformation modeling scheme increases the 3D face matching accuracy.
基于3D表面匹配的人脸识别有望克服当前基于2D图像的人脸识别系统的一些局限性。3D形状通常对姿势和光照变化具有不变性,但对非刚性面部运动(如表情)不具有不变性。在大型数据库中为每个对象收集和存储多个模板以应对各种表情是不切实际的。我们提出了一种面部表面建模和匹配方案,以在存在非刚性变形和姿势变化(多视图)的情况下,将2.5D面部扫描与3D面部模板进行匹配。应用基于分层测地线的重采样方法来提取地标,以对面部表面变形进行建模。我们能够将从一小群对象(对照组)学到的变形合成到一个3D中性模型(不在对照组中)上,从而生成一个变形模板。通过将模板与合成变形相结合,构建特定用户的(3D)可变形模型。通过将这个生成性可变形模型拟合到测试扫描上来计算匹配距离。已经开发了一个全自动的原型3D面部匹配系统。实验结果表明,所提出的变形建模方案提高了3D面部匹配的准确性。