基于光度立体的物体三维表面重建

THE RECONSTRUCTION OF 3-D SURFACE BASED ON THE PHOTOMETRY

本文采用不同光照条件下拍摄的多幅影像，利用光度立体技术建立了物体表面反射图和表面方向的关系，在规一化条件下解求物体表面的方向并进而确定表面梯度，从而克服了ｓｈａｐｅｆｒｏｍｓｈａｄｉｎｇ中的不适定问题，并提出了一种基于表面光滑准则的物体表面重建算法，在单点深度已知的约束条件下可以确定重建表面的绝对深度。实验结果表明了该重建算法的正用性和可行性。

In this paper，the multiple photos taken under different lightness are used to set up therelation between reflectance map and surface orientation by means of photometry technique.The relative surface orientation can be determined by the normolization of the normal to thesurface，and then，the absolute surface orientation can be got by using of projective transla-tion to overcome the ill－posed problem of shape from shading.Morever,an algorithm for re-construction of 3-D surface based on the surface smoothness criterion is proposed．It com-bines the constraint of a given point depth with the orientation vectors of 3-D surface to ob-tain the absolute depth of entirely visible surface.The experiment results show the correct-ness and feasibility of this reconstruction method.