计算机技术与发展Issue(1)：9-12,4.DOI:10.3969/j.issn.1673-629X.2013.01.003
基于 Phong 模型的多幅图像 SFS 算法研究
Research on Algorithm of SFS for Multi-images Based on Phong Model
摘要
Abstract
Three-dimensional (3 -D) shape reconstruction is one of the main problems in the field of computer vision. Most existing Shape-From-Shading (SFS) methods are based on the Lambertian reflectance model. The mathematical form of Lambertian reflectance model is simple,but reconstruction results of corresponding algorithms are relative poor compared with real 3-D shape of surfaces. New SFS algorithm based on the Phong model to reconstruct 3D shape of surface is proposed in this paper. The Phong model is a typical kind of non-Lambertian model to describe specular reflection. Three images with different light source directions are captured by camera first-ly. Following three reflectance map equations which are described by Phong model are established. Then the gradient vectors of the 3-D surface are calculated by solving the equations. The gray constraint and gradient component constraint conditions are used to construct tar-get function,and the corresponding Eulor-Poision equations are derived. Simultaneously,discrete difference is used to approximate differ-ential operation. New iterative 3-D shape reconstruction algorithm is proposed by the discrete difference equation. Three pixels values are used to solve certain gradient value in this method. So the ill-posed problem in traditional SFS which solves a single reflectance map e-quation can be avoided. At the same time,the algorithm solves the reflectance map equations which based on non-Lambertian model. So the proposed method can reconstruct 3D shape of surface containing specular reflection. At last,experimental results of 3-D reconstruction show that the proposed method is effective.关键词
Phong 模型/三维重建/Shape-From-Shading/反射图方程Key words
Phong model/3-D shape reconstruction/Shape-From-Shading/reflection map equation分类
信息技术与安全科学引用本文复制引用
张宁,杨磊..基于 Phong 模型的多幅图像 SFS 算法研究[J].计算机技术与发展,2013,(1):9-12,4.基金项目
国家自然科学基金资助项目(61005015) （61005015）
上海高校青年教师培养资助计划项目 （）
