Research on Height Restoration in Shape-from-Shading Method
Min Qi, Yingbo Wang, Yuelei Xu · 2019
Shape-from-shading (SFS) method can obtain 3D shape from a single shading image which is suitable for recovery of terrain height from the hill-shading map. Two kinds of SFS methods and their improved ways are studied in this paper. Gray gradient constraint is introduced into the minimization method, and it increases the details of the recovery results. The low pass filter is introduced into the local analysis method to satisfy the spherical assumption for the terrain surface. The improved methods are compared with the previous methods, and the errors are smaller than the latter.