3D Data Processing Visualization and Transmission, International Symposium on (2004)
Sept. 6, 2004 to Sept. 9, 2004
Mario Castel? , University of York, UK
Edwin R. Hancock , University of York, UK
In this paper we explore how to improve the quality of the height map recovered from faces using shape-from-shading. One of the problems with reliable face surface reconstruction using shape-from-shading is that local errors in the needle map can cause implosion of facial features, and in particular the nose. To overcome this problem in this paper we develop a method for ensuring surface convexity. This is done by modifying the gradient orientations in accordance with critical points on the surface. We utilize a local shape indicator as a criteria to decide which surface normals are to be modified. Experiments show that altering the directions of a surface normal field of a face leads to a considerable improvement in its integrated height map.
E. R. Hancock and M. Castel?, "Acquiring Height Maps of Faces from a Single Image," 3D Data Processing Visualization and Transmission, International Symposium on(3DPVT), Thessaloniki, Greece, 2004, pp. 183-190.